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Dou Q, Canavan A, Fu Y, Xiang L, Wang Y, Wang X, Jiang X, Dirr C, Wang F, Elsner M. Nitrogen stable isotope analysis of sulfonamides by derivatization-gas chromatography-isotope ratio mass spectrometry. Anal Bioanal Chem 2024; 416:4237-4247. [PMID: 38849528 DOI: 10.1007/s00216-024-05361-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2024] [Revised: 05/15/2024] [Accepted: 05/16/2024] [Indexed: 06/09/2024]
Abstract
The continuous introduction of micropollutants into the environment through livestock farming, agricultural practices, and wastewater treatment is a major concern. Among these pollutants are synthetic sulfonamide antibiotics such as sulfamethoxazole, which are not always fully degraded and pose a risk of fostering antimicrobial resistance. It is challenging to assess the degradation of sulfonamides with conventional concentration measurements. This study introduces compound-specific isotope analysis of nitrogen isotope ratios at natural abundances by derivatization-gas chromatography hyphenated with isotope ratio mass spectrometry (derivatization-GC-IRMS) as a new and more precise method for tracing the origin and degradation of sulfonamides. Here, sulfamethoxazole was used as a model compound to develop and optimize the derivatization conditions using (trimethylsilyl)diazomethane as a derivatization reagent. With the optimized conditions, accurate and reproducible δ15N analysis of sulfamethoxazole by derivatization-GC-IRMS was achieved in two different laboratories with a limit for precise isotope analysis of 3 nmol N on column, corresponding to 0.253 µg non-derivatized SMX. Application of the method to four further sulfonamides, sulfadiazine, sulfadimethoxine, sulfadimidine, and sulfathiazole, shows the versatility of the developed method. Its benefit was demonstrated in a first application, highlighting the possibility of distinguishing sulfamethoxazole from different suppliers and pharmaceutical products.
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Affiliation(s)
- Qingyuan Dou
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, No. 71 East Beijing Road, Nanjing, 210008, China
- University of Chinese Academy of Science, Beijing, 100049, China
| | - Aoife Canavan
- Chair of Analytical Chemistry and Water Chemistry, School of Natural Sciences, Department of Chemistry, Technical University of Munich, Lichtenbergstr. 4, 85748, Garching, Germany
| | - Yuhao Fu
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, No. 71 East Beijing Road, Nanjing, 210008, China
- University of Chinese Academy of Science, Beijing, 100049, China
| | - Leilei Xiang
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, No. 71 East Beijing Road, Nanjing, 210008, China
- University of Chinese Academy of Science, Beijing, 100049, China
| | - Yu Wang
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, No. 71 East Beijing Road, Nanjing, 210008, China
- University of Chinese Academy of Science, Beijing, 100049, China
| | - Xi Wang
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, No. 71 East Beijing Road, Nanjing, 210008, China
- University of Chinese Academy of Science, Beijing, 100049, China
| | - Xin Jiang
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, No. 71 East Beijing Road, Nanjing, 210008, China
- University of Chinese Academy of Science, Beijing, 100049, China
| | - Christopher Dirr
- Chair of Analytical Chemistry and Water Chemistry, School of Natural Sciences, Department of Chemistry, Technical University of Munich, Lichtenbergstr. 4, 85748, Garching, Germany
| | - Fang Wang
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, No. 71 East Beijing Road, Nanjing, 210008, China.
- University of Chinese Academy of Science, Beijing, 100049, China.
| | - Martin Elsner
- Chair of Analytical Chemistry and Water Chemistry, School of Natural Sciences, Department of Chemistry, Technical University of Munich, Lichtenbergstr. 4, 85748, Garching, Germany.
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Blessing M, Baran N. A review on environmental isotope analysis of aquatic micropollutants: Recent advances, pitfalls and perspectives. Trends Analyt Chem 2022. [DOI: 10.1016/j.trac.2022.116730] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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3
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Perini M, Bontempo L. Liquid Chromatography coupled to Isotope Ratio Mass Spectrometry (LC-IRMS): A review. Trends Analyt Chem 2022. [DOI: 10.1016/j.trac.2021.116515] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Gries P, Rathore AS, Lu X, Chiou J, Huynh YB, Lodi A, Tiziani S. Automated Trimethyl Sulfonium Hydroxide Derivatization Method for High-Throughput Fatty Acid Profiling by Gas Chromatography-Mass Spectrometry. Molecules 2021; 26:molecules26206246. [PMID: 34684827 PMCID: PMC8538735 DOI: 10.3390/molecules26206246] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 10/12/2021] [Accepted: 10/12/2021] [Indexed: 11/16/2022] Open
Abstract
Fatty acid profiling on gas chromatography–mass spectrometry (GC–MS) platforms is typically performed offline by manually derivatizing and analyzing small batches of samples. A GC–MS system with a fully integrated robotic autosampler can significantly improve sample handling, standardize data collection, and reduce the total hands-on time required for sample analysis. In this study, we report an optimized high-throughput GC–MS-based methodology that utilizes trimethyl sulfonium hydroxide (TMSH) as a derivatization reagent to convert fatty acids into fatty acid methyl esters. An automated online derivatization method was developed, in which the robotic autosampler derivatizes each sample individually and injects it into the GC–MS system in a high-throughput manner. This study investigated the robustness of automated TMSH derivatization by comparing fatty acid standards and lipid extracts, derivatized manually in batches and online automatically from four biological matrices. Automated derivatization improved reproducibility in 19 of 33 fatty acid standards, with nearly half of the 33 confirmed fatty acids in biological samples demonstrating improved reproducibility when compared to manually derivatized samples. In summary, we show that the online TMSH-based derivatization methodology is ideal for high-throughput fatty acid analysis, allowing rapid and efficient fatty acid profiling, with reduced sample handling, faster data acquisition, and, ultimately, improved data reproducibility.
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Affiliation(s)
- Paul Gries
- Department of Nutritional Sciences, College of Natural Sciences, The University of Texas at Austin, Austin, TX 78712, USA; (P.G.); (A.S.R.); (X.L.); (J.C.); (Y.B.H.); (A.L.)
- Department of Pediatrics, Dell Medical School, The University of Texas at Austin, Austin, TX 78723, USA
| | - Atul Singh Rathore
- Department of Nutritional Sciences, College of Natural Sciences, The University of Texas at Austin, Austin, TX 78712, USA; (P.G.); (A.S.R.); (X.L.); (J.C.); (Y.B.H.); (A.L.)
- Department of Pediatrics, Dell Medical School, The University of Texas at Austin, Austin, TX 78723, USA
| | - Xiyuan Lu
- Department of Nutritional Sciences, College of Natural Sciences, The University of Texas at Austin, Austin, TX 78712, USA; (P.G.); (A.S.R.); (X.L.); (J.C.); (Y.B.H.); (A.L.)
- Department of Pediatrics, Dell Medical School, The University of Texas at Austin, Austin, TX 78723, USA
| | - Jennifer Chiou
- Department of Nutritional Sciences, College of Natural Sciences, The University of Texas at Austin, Austin, TX 78712, USA; (P.G.); (A.S.R.); (X.L.); (J.C.); (Y.B.H.); (A.L.)
- Department of Pediatrics, Dell Medical School, The University of Texas at Austin, Austin, TX 78723, USA
| | - Yen Bao Huynh
- Department of Nutritional Sciences, College of Natural Sciences, The University of Texas at Austin, Austin, TX 78712, USA; (P.G.); (A.S.R.); (X.L.); (J.C.); (Y.B.H.); (A.L.)
- Department of Pediatrics, Dell Medical School, The University of Texas at Austin, Austin, TX 78723, USA
| | - Alessia Lodi
- Department of Nutritional Sciences, College of Natural Sciences, The University of Texas at Austin, Austin, TX 78712, USA; (P.G.); (A.S.R.); (X.L.); (J.C.); (Y.B.H.); (A.L.)
- Department of Pediatrics, Dell Medical School, The University of Texas at Austin, Austin, TX 78723, USA
| | - Stefano Tiziani
- Department of Nutritional Sciences, College of Natural Sciences, The University of Texas at Austin, Austin, TX 78712, USA; (P.G.); (A.S.R.); (X.L.); (J.C.); (Y.B.H.); (A.L.)
- Department of Pediatrics, Dell Medical School, The University of Texas at Austin, Austin, TX 78723, USA
- Department of Oncology, Dell Medical School, LiveSTRONG Cancer Institutes, The University of Texas at Austin, Austin, TX 78723, USA
- Correspondence: ; Tel.: +1-512-495-4706
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Cui G, Lartey-Young G, Chen C, Ma L. Photodegradation of pesticides using compound-specific isotope analysis (CSIA): a review. RSC Adv 2021; 11:25122-25140. [PMID: 35478915 PMCID: PMC9037106 DOI: 10.1039/d1ra01658j] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Accepted: 07/14/2021] [Indexed: 12/20/2022] Open
Abstract
Pesticides are commonly applied in agriculture to protect crops from pests, weeds, and harmful pathogens. However, chronic, low-level exposure to pesticides can be toxic to humans. Photochemical degradation of pesticides in water, soil, and other environmental media can alter their environmental fate and toxicity. Compound-specific isotope analysis (CSIA) is an advanced diagnostic tool to quantify the degradation of organic pollutants and provide insight into reaction mechanisms without the need to identify transformation products. CSIA allows for the direct quantification of organic degradation, including pesticides. This review summarizes the recent developments observed in photodegradation studies on different categories of pesticides using CSIA technology. Only seven pesticides have been studied using photodegradation, and these studies have mostly occurred in the last five years. Knowledge gaps in the current literature, as well as potential approaches for CSIA technology for pesticide monitoring, are discussed in this review. Furthermore, the CSIA analytical method is challenged by chemical element types, the accuracy of instrument analysis, reaction conditions, and the stability of degradation products. Finally, future research applications and the operability of this method are also discussed.
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Affiliation(s)
- Guolu Cui
- School of Environmental Science and Engineering, Tongji University 1239 Siping Road Shanghai 200092 China
- Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092 China
| | - George Lartey-Young
- School of Environmental Science and Engineering, Tongji University 1239 Siping Road Shanghai 200092 China
- Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092 China
| | - Chong Chen
- School of Environmental Science and Engineering, Tongji University 1239 Siping Road Shanghai 200092 China
- Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092 China
| | - Limin Ma
- School of Environmental Science and Engineering, Tongji University 1239 Siping Road Shanghai 200092 China
- Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092 China
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Knossow N, Siebner H, Bernstein A. Isotope analysis method for the herbicide bromoxynil and its application to study photo-degradation processes. JOURNAL OF HAZARDOUS MATERIALS 2020; 388:122036. [PMID: 31951995 DOI: 10.1016/j.jhazmat.2020.122036] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Revised: 12/29/2019] [Accepted: 01/06/2020] [Indexed: 06/10/2023]
Abstract
Bromoxynil is an increasingly applied nitrile herbicide used for post-emergent control of annual broadleaved weeds. Compound-specific isotope analysis (CSIA) of the compound is of interest for studying its environmental fate, yet is challenging following its polar nature. We present a CSIA method for bromoxynil that includes offline thin-layer chromatography purification followed by an elemental analyzer isotope ratio mass spectrometer (EA-IRMS). This method was shown to be accurate and precise for δ13C and δ15N analysis of the compound (standard deviation of replicate standards <0.5‰). The method was applied to photodegraded samples, either radiated under laboratory condition with a UV lamp, or exposed to sunlight under environmental conditions. Dominating degradation products were similar in both cases. Nevertheless, isotope effects differed, presenting a strong inverse carbon isotope effect (εC = 4.74 ± 0.82‰) and a weak inverse nitrogen isotope effect (εN = 0.76 ± 0.12‰) for the laboratory experiment, and an insignificant carbon isotope effect (εC = 0.34 ± 0.44‰) and a normal nitrogen isotope effect (εN = -3.70 ± 0.30‰) for the natural conditions experiment. The differences in δ13C vs. δ15N enrichment trends suggest different mechanism for the two processes. Finally, the obtained dual isotope trend for natural conditions provide the basis for studying the dominance of photodegradation as a degradation route in the environment.
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Affiliation(s)
- Nadav Knossow
- Zuckerberg Institute for Water Research, Department of Environmental Hydrology and Microbiology, Ben-Gurion University of the Negev, Sede Boqer Campus, 8499000, Israel
| | - Hagar Siebner
- Zuckerberg Institute for Water Research, Department of Environmental Hydrology and Microbiology, Ben-Gurion University of the Negev, Sede Boqer Campus, 8499000, Israel
| | - Anat Bernstein
- Zuckerberg Institute for Water Research, Department of Environmental Hydrology and Microbiology, Ben-Gurion University of the Negev, Sede Boqer Campus, 8499000, Israel.
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7
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Steinmetz Z, Kurtz MP, Zubrod JP, Meyer AH, Elsner M, Schaumann GE. Biodegradation and photooxidation of phenolic compounds in soil-A compound-specific stable isotope approach. CHEMOSPHERE 2019; 230:210-218. [PMID: 31103867 DOI: 10.1016/j.chemosphere.2019.05.030] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Revised: 04/24/2019] [Accepted: 05/04/2019] [Indexed: 06/09/2023]
Abstract
Phenolic compounds occur in a variety of plants and can be used as model compounds for investigating the fate of organic wastewater, lignin, or soil organic matter in the environment. The aim of this study was to better understand and differentiate mechanisms associated with photo- and biodegradation of tyrosol, vanillin, vanillic acid, and coumaric acid in soil. In a 29 d incubation experiment, soil spiked with these phenolic compounds was either subjected to UV irradiation under sterile conditions or to the native soil microbial community in the dark. Changes in the isotopic composition (δ13C) of phenolic compounds were determined by gas chromatography-isotope ratio mass spectrometry and complemented by concentration measurements. Phospholipid-derived fatty acid and ergosterol biomarkers together with soil water repellency measurements provided information on soil microbial and physical properties. Biodegradation followed pseudo-first-order dissipation kinetics, enriched remaining phenolic compounds in 13C, and was associated with increased fungal rather than bacterial biomarkers. Growing mycelia rendered the soil slightly water repellent. High sample variation limited the reliable estimation of apparent kinetic isotope effects (AKIEs) to tyrosol. The AKIE of tyrosol biodegradation was 1.007 ± 0.002. Photooxidation kinetics were of pseudo-zero- or first-order with an AKIE of 1.02 ± 0.01 for tyrosol, suggesting a hydroxyl-radical mediated degradation process. Further research needs to address δ13C variation among sample replicates potentially originating from heterogeneous reaction spaces in soil. Here, nuclear magnetic resonance or nanoscopic imaging could help to better understand the distribution of organic compounds and their transformation in the soil matrix.
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Affiliation(s)
- Zacharias Steinmetz
- iES Landau, Institute for Environmental Sciences, Group of Environmental and Soil Chemistry, University of Koblenz-Landau, Fortstraße 7, 76829, Landau, Germany
| | - Markus P Kurtz
- iES Landau, Institute for Environmental Sciences, Group of Environmental and Soil Chemistry, University of Koblenz-Landau, Fortstraße 7, 76829, Landau, Germany
| | - Jochen P Zubrod
- iES Landau, Institute for Environmental Sciences, Group of Ecotoxicology & Environment, University of Koblenz-Landau, Fortstraße 7, 76829, Landau, Germany
| | - Armin H Meyer
- Helmholtz Zentrum Muenchen, Institute of Groundwater Ecology, Ingolstädter Landstraße 1, 85764, Neuherberg, Germany
| | - Martin Elsner
- Helmholtz Zentrum Muenchen, Institute of Groundwater Ecology, Ingolstädter Landstraße 1, 85764, Neuherberg, Germany; Institute of Hydrochemistry, Chair for Analytical Chemistry and Water Chemistry, Technical University of Munich, Marchioninistraße 17, 81377, Munich, Germany
| | - Gabriele E Schaumann
- iES Landau, Institute for Environmental Sciences, Group of Environmental and Soil Chemistry, University of Koblenz-Landau, Fortstraße 7, 76829, Landau, Germany.
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Kuder T, Bernstein A, Gelman F. Derivatization-free method for compound-specific isotope analysis of nonexchangeable hydrogen of 4-bromophenol. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2019; 33:667-677. [PMID: 30512206 DOI: 10.1002/rcm.8361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2018] [Revised: 11/16/2018] [Accepted: 11/17/2018] [Indexed: 06/09/2023]
Abstract
RATIONALE Compound-specific isotope analysis (CSIA) is a valuable tool in environmental chemistry and in other fields of science. Currently, hydrogen CSIA of polar compounds containing exchangeable hydrogen is uncommon. To extend the scope of CSIA applications, we present an alternative method of analysis, bypassing the typical step of derivatization. The method is demonstrated for two environmental contaminants, 4-bromophenol (4BP) and 2,4,6-tribromophenol (TBP). METHODS Net isotope ratios obtained by CSIA combine the isotope composition of nonexchangeable, carbon-bound hydrogen and the exchangeable hydroxyl hydrogen. To constrain the isotope composition of the latter, an ethyl acetate solution of 4BP or TBP injected into the IRMS instrument was amended with excess water of known isotope composition. The results were calibrated using bracketing control samples analyzed in sequence with the unknown samples and the known isotope ratios of water present in ethyl acetate solution. RESULTS The analytical precision was comparable to the precision for halogenated compounds without exchangeable hydrogen, analyzed using similar instrumentation. The isotope ratios of the bromophenols correlated with the isotope composition of the water in the sample matrix, suggesting that the hydroxyl group of the target compound remained close to the equilibrium with the sample water during the passage through the instrument. Based on this relationship, the signatures of the nonexchangeable hydrogen were obtained using the isotope composition of sample water as the proxy for the isotope composition of the target compound hydroxyl group. CONCLUSIONS The developed method could be adopted to analysis of other low molecular weight compounds amenable to gas chromatography without the absolute need for derivatization. Currently, the method can be used for samples from laboratory experiments, with high concentrations of the target compound to provide mechanistic insight into the degradation mechanisms. Further work would be required to optimize the method to low concentration environmental samples.
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Affiliation(s)
- Tomasz Kuder
- School of Geology and Geophysics, University of Oklahoma, 100 E. Boyd Street, SEC 710, Norman, OK, 73019, USA
| | - Anat Bernstein
- Zuckerberg Institute for Water Research, Department of Environmental Hydrology and Microbiology, Ben-Gurion University of the Negev, Sede Boqer Campus, 84990, Israel
| | - Faina Gelman
- Geological Survey of Israel, 30 Malkhei Israel St., Jerusalem, 95501, Israel
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Torrentó C, Bakkour R, Glauser G, Melsbach A, Ponsin V, Hofstetter TB, Elsner M, Hunkeler D. Solid-phase extraction method for stable isotope analysis of pesticides from large volume environmental water samples. Analyst 2019; 144:2898-2908. [PMID: 30896686 DOI: 10.1039/c9an00160c] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Compound-specific isotope analysis (CSIA) is a valuable tool for assessing the fate of organic pollutants in the environment. However, the requirement of sufficient analyte mass for precise isotope ratio mass spectrometry combined with prevailing low environmental concentrations currently limits comprehensive applications to many micropollutants. Here, we evaluate the upscaling of solid-phase extraction (SPE) approaches for routine CSIA of herbicides. To cover a wide range of polarity, a SPE method with two sorbents (a hydrophobic hypercrosslinked sorbent and a hydrophilic sorbent) was developed. Extraction conditions, including the nature and volume of the elution solvent, the amount of sorbent and the solution pH, were optimized. Extractions of up to 10 L of agricultural drainage water (corresponding to up to 200 000-fold pre-concentration) were successfully performed for precise and sensitive carbon and nitrogen CSIA of the target herbicides atrazine, acetochlor, metolachlor and chloridazon, and metabolites desethylatrazine, desphenylchloridazon and 2,6-dichlorobenzamide in the sub-μg L-1-range. 13C/12C and 15N/14N ratios were measured by gas chromatography-isotope ratio mass spectrometry (GC/IRMS), except for desphenylchloridazon, for which liquid chromatography (LC/IRMS) and derivatization-GC/IRMS were used, respectively. The method validated in this study is an important step towards analyzing isotope ratios of pesticide mixtures in aquatic systems and holds great potential for multi-element CSIA applications to trace pesticide degradation in complex environments.
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Affiliation(s)
- Clara Torrentó
- Centre for Hydrogeology and Geothermics (CHYN), University of Neuchâtel, 2000 Neuchâtel, Switzerland.
| | - Rani Bakkour
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Dübendorf, Switzerland
| | - Gaétan Glauser
- Neuchâtel Platform of Analytical Chemistry (NPAC), University of Neuchâtel, 2000 Neuchâtel, Switzerland
| | - Aileen Melsbach
- Helmholtz Zentrum München, Institute of Groundwater Ecology, 85764 Neuherberg, Germany
| | - Violaine Ponsin
- Centre for Hydrogeology and Geothermics (CHYN), University of Neuchâtel, 2000 Neuchâtel, Switzerland.
| | - Thomas B Hofstetter
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Dübendorf, Switzerland
| | - Martin Elsner
- Helmholtz Zentrum München, Institute of Groundwater Ecology, 85764 Neuherberg, Germany and Technical University of Munich, Chair of Analytical Chemistry and Water Chemistry, 81377 Munich, Germany
| | - Daniel Hunkeler
- Centre for Hydrogeology and Geothermics (CHYN), University of Neuchâtel, 2000 Neuchâtel, Switzerland.
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Melsbach A, Ponsin V, Torrentó C, Lihl C, Hofstetter TB, Hunkeler D, Elsner M. 13C- and 15N-Isotope Analysis of Desphenylchloridazon by Liquid Chromatography-Isotope-Ratio Mass Spectrometry and Derivatization Gas Chromatography-Isotope-Ratio Mass Spectrometry. Anal Chem 2019; 91:3412-3420. [PMID: 30672693 DOI: 10.1021/acs.analchem.8b04906] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The widespread application of herbicides impacts surface water and groundwater. Metabolites (e.g., desphenylchloridazon from chloridazon) may be persistent and even more polar than the parent herbicide, which increases the risk of groundwater contamination. When parent herbicides are still applied, metabolites are constantly formed and may also be degraded. Evaluating their degradation on the basis of concentration measurements is, therefore, difficult. This study presents compound-specific stable-isotope analysis (CSIA) of nitrogen- and carbon-isotope ratios at natural abundances as an alternative analytical approach to track the origin, formation, and degradation of desphenylchloridazon (DPC), the major degradation product of the herbicide chloridazon. Methods were developed and validated for carbon- and nitrogen-isotope analysis (δ13C and δ15N) of DPC by liquid chromatography-isotope-ratio mass spectrometry (LC-IRMS) and derivatization gas chromatography-IRMS (GC-IRMS), respectively. Injecting standards directly onto an Atlantis LC-column resulted in reproducible δ13C-isotope analysis (standard deviation <0.5‰) by LC-IRMS with a limit of precise analysis of 996 ng of DPC on-column. Accurate and reproducible δ15N analysis with a standard deviation of <0.4‰ was achieved by GC-IRMS after derivatization of >100 ng of DPC with 160-fold excess of (trimethylsilyl)diazomethane. Application of the method to environmental-seepage water indicated that newly formed DPC could be distinguished from "old" DPC by the different isotopic signatures of the two DPC sources.
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Affiliation(s)
- Aileen Melsbach
- Helmholtz Zentrum München , Institute of Groundwater Ecology , 85764 Neuherberg , Germany
| | - Violaine Ponsin
- Centre for Hydrogeology and Geothermics (CHYN) , University of Neuchâtel , 2000 Neuchâtel , Switzerland
| | - Clara Torrentó
- Centre for Hydrogeology and Geothermics (CHYN) , University of Neuchâtel , 2000 Neuchâtel , Switzerland
| | - Christina Lihl
- Helmholtz Zentrum München , Institute of Groundwater Ecology , 85764 Neuherberg , Germany
| | - Thomas B Hofstetter
- Swiss Federal Institute of Aquatic Science and Technology (Eawag) , 8600 Dübendorf , Switzerland
| | - Daniel Hunkeler
- Centre for Hydrogeology and Geothermics (CHYN) , University of Neuchâtel , 2000 Neuchâtel , Switzerland
| | - Martin Elsner
- Helmholtz Zentrum München , Institute of Groundwater Ecology , 85764 Neuherberg , Germany.,Chair of Analytical Chemistry and Water Chemistry , Technical University of Munich , 81377 Munich , Germany
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11
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Llana-Ruíz-Cabello M, Pichardo S, Jiménez-Morillo N, González-Vila F, Guillamón E, Bermúdez J, Aucejo S, Camean A, González-Pérez J. Pyrolysis-gas chromatography–isotope ratio mass spectrometry for monitoring natural additives in polylactic acid active food packages. J Chromatogr A 2017; 1525:145-151. [DOI: 10.1016/j.chroma.2017.10.023] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Revised: 09/28/2017] [Accepted: 10/07/2017] [Indexed: 11/17/2022]
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Elsner M, Imfeld G. Compound-specific isotope analysis (CSIA) of micropollutants in the environment - current developments and future challenges. Curr Opin Biotechnol 2016; 41:60-72. [PMID: 27340797 DOI: 10.1016/j.copbio.2016.04.014] [Citation(s) in RCA: 91] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Revised: 03/14/2016] [Accepted: 04/12/2016] [Indexed: 10/21/2022]
Abstract
Over the last decade, the occurrence of micropollutants in the environment has become a worldwide issue of increasing concern. Compound-specific stable-isotope analysis (CSIA) of natural isotopic abundance may greatly enhance the evaluation of sources and transformation processes of micropollutants, such as pesticides, personal care products or pharmaceuticals. We summarize recent advances from laboratory studies, review current limitations and analytical challenges associated with low concentrations and high polarity of micropollutants, and delineate the potential of micropolluant CSIA for field applications. We highlight future challenges and prospects regarding source apportionment, identification of biotic and abiotic transformation reactions on a mechanistic level, as well as integrative evaluation of degradation hot spots on the catchment scale. Such advances may feed into a framework for risk assessment of micropollutants that includes CSIA.
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Affiliation(s)
- Martin Elsner
- Institute of Groundwater Ecology, Helmholtz Zentrum München, Ingolstädter Landstraße 1, 85764 Neuherberg, Germany.
| | - Gwenaël Imfeld
- Laboratoire d'Hydrologie et de Géochimie de Strasbourg (LHyGeS), UMR 7517, Université de Strasbourg/EOST, CNRS, 1 rue Blessig, 67084 Strasbourg Cedex, France
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13
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Schürner HKV, Maier MP, Eckert D, Brejcha R, Neumann CC, Stumpp C, Cirpka OA, Elsner M. Compound-Specific Stable Isotope Fractionation of Pesticides and Pharmaceuticals in a Mesoscale Aquifer Model. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:5729-39. [PMID: 27100740 DOI: 10.1021/acs.est.5b03828] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Compound-specific isotope analysis (CSIA) receives increasing interest for its ability to detect natural degradation of pesticides and pharmaceuticals. Despite recent laboratory studies, CSIA investigations of such micropollutants in the environment are still rare. To explore the certainty of information obtainable by CSIA in a near-environmental setting, a pulse of the pesticide bentazone, the pesticide metabolite 2,6-dichlorobenzamide (BAM), and the pharmaceuticals diclofenac and ibuprofen was released into a mesoscale aquifer with quasi-two-dimensional flow. Concentration breakthrough curves (BTC) of BAM and ibuprofen demonstrated neither degradation nor sorption. Bentazone was transformed but did not sorb significantly, whereas diclofenac showed both degradation and sorption. Carbon and nitrogen CSIA could be accomplished in similar concentrations as for "traditional" priority pollutants (low μg/L range), however, at the cost of uncertainties (0.4-0.5‰ (carbon), 1‰ (nitrogen)). Nonetheless, invariant carbon and nitrogen isotope values confirmed that BAM was neither degraded nor sorbed, while significant enrichment of (13)C and in particular (15)N corroborated transformation of diclofenac and bentazone. Retardation of diclofenac was reflected in additional (15)N sorption isotope effects, whereas isotope fractionation of transverse dispersion could not be identified. These results provide a benchmark on the performance of CSIA to monitor the reactivity of micropollutants in aquifers and may guide future efforts to accomplish CSIA at even lower concentrations (ng/L range).
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Affiliation(s)
- Heide K V Schürner
- Institute of Groundwater Ecology, Helmholtz Zentrum München , Ingolstädter Landstraße 1, 85764 Neuherberg, Germany
| | - Michael P Maier
- Institute of Groundwater Ecology, Helmholtz Zentrum München , Ingolstädter Landstraße 1, 85764 Neuherberg, Germany
| | - Dominik Eckert
- Center for Applied Geosciences, University of Tübingen , Hölderlinstraße 12, 72074 Tübingen, Germany
| | - Ramona Brejcha
- Institute of Groundwater Ecology, Helmholtz Zentrum München , Ingolstädter Landstraße 1, 85764 Neuherberg, Germany
| | - Claudia-Constanze Neumann
- Institute of Groundwater Ecology, Helmholtz Zentrum München , Ingolstädter Landstraße 1, 85764 Neuherberg, Germany
| | - Christine Stumpp
- Institute of Groundwater Ecology, Helmholtz Zentrum München , Ingolstädter Landstraße 1, 85764 Neuherberg, Germany
| | - Olaf A Cirpka
- Center for Applied Geosciences, University of Tübingen , Hölderlinstraße 12, 72074 Tübingen, Germany
| | - Martin Elsner
- Institute of Groundwater Ecology, Helmholtz Zentrum München , Ingolstädter Landstraße 1, 85764 Neuherberg, Germany
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14
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Mogusu EO, Wolbert JB, Kujawinski DM, Jochmann MA, Elsner M. Dual element ((15)N/(14)N, (13)C/(12)C) isotope analysis of glyphosate and AMPA by derivatization-gas chromatography isotope ratio mass spectrometry (GC/IRMS) combined with LC/IRMS. Anal Bioanal Chem 2015; 407:5249-60. [PMID: 25967147 DOI: 10.1007/s00216-015-8721-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2015] [Revised: 04/16/2015] [Accepted: 04/17/2015] [Indexed: 10/23/2022]
Abstract
To assess sources and degradation of the herbicide glyphosate [N-(phosphonomethyl) glycine] and its metabolite AMPA (aminomethylphosphonic acid), concentration measurements are often inconclusive and even (13)C/(12)C analysis alone may give limited information. To advance isotope ratio analysis of an additional element, we present compound-specific (15)N/(14)N analysis of glyphosate and AMPA by a two step derivatization in combination with gas chromatography/isotope ratio mass spectrometry (GC/IRMS). The N-H group was derivatized with isopropyl chloroformate (iso-PCF), and remaining acidic groups were subsequently methylated with trimethylsilyldiazomethane (TMSD). Iso-PCF treatment at pH <10 gave too low (15)N/(14)N ratios indicating an incomplete derivatization; in contrast, too high (15)N/(14)N ratios at pH >10 indicated decomposition of the derivative. At pH 10, and with an excess of iso-PCF by 10-24, greatest yields and accurate (15)N/(14)N ratios were obtained (deviation from elemental analyzer-IRMS: -0.2 ± 0.9% for glyphosate; -0.4 ± 0.7% for AMPA). Limits for accurate δ(15)N analysis of glyphosate and AMPA were 150 and 250 ng injected, respectively. A combination of δ(15)N and δ(13)C analysis by liquid chromatography/isotope ratio mass spectrometry (LC/IRMS) (1) enabled an improved distinction of commercial glyphosate products and (2) showed that glyphosate isotope values during degradation by MnO2 clearly fell outside the commercial product range. This highlights the potential of combined carbon and nitrogen isotopes analysis to trace sources and degradation of glyphosate.
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Affiliation(s)
- Emmanuel O Mogusu
- Helmholtz Zentrum München, Institute of Groundwater Ecology, Ingolstädter Landstrasse 1, 85764, Neuherberg, Germany
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15
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Maier MP, De Corte S, Nitsche S, Spaett T, Boon N, Elsner M. C & N isotope analysis of diclofenac to distinguish oxidative and reductive transformation and to track commercial products. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2014; 48:2312-20. [PMID: 24397428 DOI: 10.1021/es403214z] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Although diclofenac is frequently found in aquatic systems, its degradability in the environment remains imperfectly understood. On the one hand, evidence from concentration analysis alone is inconclusive if an unknown hydrology impedes a distinction between degradation and dilution. On the other hand, not all transformation products may be detectable. As a new approach, we therefore developed GC-IRMS (gas chromatography-isotope-ratio mass-spectrometry) analysis for carbon and nitrogen isotope measurements of diclofenac. The method uses a derivatization step that can be conducted either online or offline, for optimized throughput or sensitivity, respectively. In combination with on-column injection, the latter method enables determination of diclofenac isotope ratios down to the sub-μgL(-1) range in environmental samples. Degradation in an aerobic sediment-water system showed strong nitrogen isotope fractionation (εN = -7.1‰), whereas reductive diclofenac dechlorination was associated with significant carbon isotope fractionation (εC = -2.0‰). Hence dual element isotope analysis bears potential not only to detect diclofenac degradation, but even to distinguish both transformation pathways in the environment. In an explorative survey, analysis of commercial diclofenac products showed significant differences in carbon and nitrogen isotope ratios, demonstrating a further potential to track, and potentially even to authenticate, commercial production batches.
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Affiliation(s)
- Michael P Maier
- Helmholtz Zentrum Muenchen, German Research Center, Institute of Groundwater Ecology , Ingolstädter Landstrasse 1, Neuherberg D-85764, Germany
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16
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Zhang L, Thevis M, Piper T, Jochmann MA, Wolbert JB, Kujawinski DM, Wiese S, Teutenberg T, Schmidt TC. Carbon Isotope Ratio Analysis of Steroids by High-Temperature Liquid Chromatography-Isotope Ratio Mass Spectrometry. Anal Chem 2014; 86:2297-302. [DOI: 10.1021/ac403353x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Lijun Zhang
- Instrumental
Analytical Chemistry, University Duisburg-Essen, Universitätsstr. 5, 45141 Essen, Germany
| | - Mario Thevis
- Institute
of Biochemistry,
Center for Preventive Doping Research, German Sport University Cologne, Am Sportpark
Muengersdorf 6, 50933 Cologne, Germany
| | - Thomas Piper
- Institute
of Biochemistry,
Center for Preventive Doping Research, German Sport University Cologne, Am Sportpark
Muengersdorf 6, 50933 Cologne, Germany
| | - Maik A. Jochmann
- Instrumental
Analytical Chemistry, University Duisburg-Essen, Universitätsstr. 5, 45141 Essen, Germany
| | - J. Benjamin Wolbert
- Instrumental
Analytical Chemistry, University Duisburg-Essen, Universitätsstr. 5, 45141 Essen, Germany
| | - Dorothea M. Kujawinski
- Instrumental
Analytical Chemistry, University Duisburg-Essen, Universitätsstr. 5, 45141 Essen, Germany
| | - Steffen Wiese
- Institute of Energy and Environmental Technology e.V., (IUTA), Bliersheimer Strasse 60, 47229 Duisburg, Germany
| | - Thorsten Teutenberg
- Institute of Energy and Environmental Technology e.V., (IUTA), Bliersheimer Strasse 60, 47229 Duisburg, Germany
| | - Torsten C. Schmidt
- Instrumental
Analytical Chemistry, University Duisburg-Essen, Universitätsstr. 5, 45141 Essen, Germany
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17
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Enantioselective stable isotope analysis (ESIA) of polar herbicides. Anal Bioanal Chem 2013; 405:2825-31. [DOI: 10.1007/s00216-013-6745-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2012] [Revised: 01/07/2013] [Accepted: 01/13/2013] [Indexed: 10/27/2022]
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18
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Milosevic N, Qiu S, Elsner M, Einsiedl F, Maier MP, Bensch HKV, Albrechtsen HJ, Bjerg PL. Combined isotope and enantiomer analysis to assess the fate of phenoxy acids in a heterogeneous geologic setting at an old landfill. WATER RESEARCH 2013; 47:637-649. [PMID: 23168311 DOI: 10.1016/j.watres.2012.10.029] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2012] [Revised: 09/20/2012] [Accepted: 10/14/2012] [Indexed: 06/01/2023]
Abstract
Phenoxy acid herbicides and their potential metabolites represent industrial or agricultural waste that impacts groundwater and surface waters through leaching from old landfills throughout the world. Fate assessment of dichlorprop and its putative metabolite 4-CPP (2-(4-chlorophenoxy)propionic acid) is frequently obstructed by inconclusive evidence from redox conditions, heterogeneous geologic settings (e.g. clay till) and ambiguous parent-daughter relationships (i.e. 4-CPP may be daughter product or impurity of dichlorprop). For the first time, a combination of four methods was tested to assess transformation of phenoxy acids at a contaminated landfill (Risby site): analysis of (i) parent and daughter compound concentrations, (ii) enantiomer ratios (iii) compound-specific isotope analysis and (iv) enantiomer-specific isotope analysis. Additionally, water isotopes and chloride were used as conservative tracers to delineate two distinct groundwater flow paths in the clay till. Metabolite concentrations and isotope ratios of chlorinated ethenes demonstrated dechlorination activity in the area with highest leachate concentrations (hotspot) indicating favorable conditions also for dechlorination of dichlorprop to 4-CPP and further to phenoxypropionic acid. Combined evidence from concentrations, enantiomer ratios and isotope ratios of dichlorprop and 4-CPP confirmed their dechlorination in the hotspot and gave evidence for further degradation of 4-CPP downgradient of the hotspot. A combination of 4-CPP enantiomer and isotope analysis indicated different enantioselectivity and isotope fractionation, i.e. different modes of 4-CPP degradation, at different locations. This combined information was beyond the reach of any of the methods applied alone demonstrating the power of the new combined approach.
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Affiliation(s)
- N Milosevic
- Department of Environmental Engineering, Technical University of Denmark, Miljoevej, Building 113, DK-2800 Kgs. Lyngby, Denmark.
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19
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Kujawinski DM, Wolbert JB, Zhang L, Jochmann MA, Widory D, Baran N, Schmidt TC. Carbon isotope ratio measurements of glyphosate and AMPA by liquid chromatography coupled to isotope ratio mass spectrometry. Anal Bioanal Chem 2013; 405:2869-78. [DOI: 10.1007/s00216-012-6669-0] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2012] [Revised: 12/06/2012] [Accepted: 12/17/2012] [Indexed: 11/28/2022]
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20
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Spahr S, Huntscha S, Bolotin J, Maier MP, Elsner M, Hollender J, Hofstetter TB. Compound-specific isotope analysis of benzotriazole and its derivatives. Anal Bioanal Chem 2012; 405:2843-56. [DOI: 10.1007/s00216-012-6526-1] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2012] [Revised: 10/19/2012] [Accepted: 10/24/2012] [Indexed: 10/27/2022]
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21
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Kujawinski DM, Zhang L, Schmidt TC, Jochmann MA. When Other Separation Techniques Fail: Compound-Specific Carbon Isotope Ratio Analysis of Sulfonamide Containing Pharmaceuticals by High-Temperature-Liquid Chromatography-Isotope Ratio Mass Spectrometry. Anal Chem 2012; 84:7656-63. [DOI: 10.1021/ac300116w] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - Lijun Zhang
- Instrumental
Analytical Chemistry, University of Duisburg-Essen, 45141 Essen, Germany
| | - Torsten C. Schmidt
- Instrumental
Analytical Chemistry, University of Duisburg-Essen, 45141 Essen, Germany
| | - Maik A. Jochmann
- Instrumental
Analytical Chemistry, University of Duisburg-Essen, 45141 Essen, Germany
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22
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Reinnicke S, Juchelka D, Steinbeiss S, Meyer A, Hilkert A, Elsner M. Gas chromatography/isotope ratio mass spectrometry of recalcitrant target compounds: performance of different combustion reactors and strategies for standardization. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2012; 26:1053-60. [PMID: 22467455 DOI: 10.1002/rcm.6199] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
RATIONALE Compound-specific isotope analysis (CSIA) relies on continuous flow combustion of organic substances to CO(2) and N(2) in a miniature reactor to measure (13)C/(12)C and (15)N/(14) N stable isotope ratios. Accurate analysis is well established for many volatile hydrocarbons. In contrast, compounds which contain hetero and halogen atoms are less volatile and may be more recalcitrant to combustion. METHODS This study tested carbon and nitrogen isotope analysis of atrazine, desethylatrazine (DEA), dichlobenil and 2,6-dichlorobenzamide (BAM) by gas chromatography/isotope ratio mass spectrometry (GC/IRMS) with multiple reactor tubes of two different kinds (conventional CuO/NiO/Pt and a NiO tube/CuO-NiO reactor prototype). RESULTS The advantages of the NiO tube/CuO-NiO reactor were the absence of an additional reduction reactor, the possibility of routine reoxidation in nitrogen isotope analysis, and reliable atrazine and DEA measurements over several hundred injections. In contrast, BAM analysis showed good accuracy for carbon, but notable variations in the trueness of nitrogen isotope ratios. Accurate carbon and nitrogen analysis was nevertheless possible by bracketing samples with external compound-specific standards and subsequent offset correction. CONCLUSIONS We conclude that instrument data should never be taken at its 'face value', but must consistently be validated with compound-specific standards of the respective analytes.
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Affiliation(s)
- Sandra Reinnicke
- Institute of Groundwater Ecology, Helmholtz Zentrum Muenchen, Ingolstaedter Landstr. 1, 85764, Neuherberg, Germany
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23
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Elsner M, Jochmann MA, Hofstetter TB, Hunkeler D, Bernstein A, Schmidt TC, Schimmelmann A. Current challenges in compound-specific stable isotope analysis of environmental organic contaminants. Anal Bioanal Chem 2012; 403:2471-91. [DOI: 10.1007/s00216-011-5683-y] [Citation(s) in RCA: 202] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2011] [Revised: 12/15/2011] [Accepted: 12/18/2011] [Indexed: 11/30/2022]
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24
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Zhang L, Kujawinski DM, Jochmann MA, Schmidt TC. High-temperature reversed-phase liquid chromatography coupled to isotope ratio mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2011; 25:2971-2980. [PMID: 21953951 DOI: 10.1002/rcm.5069] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Compound-specific isotope analysis (CSIA) by liquid chromatography coupled to isotope ratio mass spectrometry (LC/IRMS) has until now been based on ion-exchange separation. In this work, high-temperature reversed-phase liquid chromatography was coupled to, and for the first time carefully evaluated for, isotope ratio mass spectrometry (HT-LC/IRMS) with four different stationary phases. Under isothermal and temperature gradient conditions, the column bleed of XBridge C(18) (up to 180 °C), Acquity C(18) (up to 200 °C), Triart C(18) (up to 150 °C), and Zirchrom PBD (up to 150 °C) had no influence on the precision and accuracy of δ(13) C measurements, demonstrating the suitability of these columns for HT-LC/IRMS analysis. Increasing the temperature during the LC/IRMS analysis of caffeine on two C(18) columns was observed to result in shortened analysis time. The detection limit of HT-RPLC/IRMS obtained for caffeine was 30 mg L(-1) (corresponding to 12.4 nmol carbon on-column). Temperature-programmed LC/IRMS (i) accomplished complete separation of a mixture of caffeine derivatives and a mixture of phenols and (ii) did not affect the precision and accuracy of δ(13)C measurements compared with flow injection analysis without a column. With temperature-programmed LC/IRMS, some compounds that coelute at room temperature could be baseline resolved and analyzed for their individual δ(13)C values, leading to an important extension of the application range of CSIA.
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Affiliation(s)
- Lijun Zhang
- Instrumental Analytical Chemistry, University of Duisburg-Essen, Essen, Germany
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25
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Henderson W, Nicholson BK, Ujam OT. Further investigations on the methylation chemistry of [Pt2(µ-S)2(PPh3)4]. J COORD CHEM 2011. [DOI: 10.1080/00958972.2011.606366] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- William Henderson
- a Department of Chemistry , University of Waikato , Private Bag 3105, Hamilton 3240 , New Zealand
| | - Brian K. Nicholson
- a Department of Chemistry , University of Waikato , Private Bag 3105, Hamilton 3240 , New Zealand
| | - Oguejiofo T. Ujam
- a Department of Chemistry , University of Waikato , Private Bag 3105, Hamilton 3240 , New Zealand
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26
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Direct analysis of fatty acid profile from milk by thermochemolysis–gas chromatography–mass spectrometry. J Chromatogr A 2011; 1218:316-23. [DOI: 10.1016/j.chroma.2010.11.011] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2010] [Revised: 10/31/2010] [Accepted: 11/08/2010] [Indexed: 10/18/2022]
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27
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Elsner M. Stable isotope fractionation to investigate natural transformation mechanisms of organic contaminants: principles, prospects and limitations. ACTA ACUST UNITED AC 2010; 12:2005-31. [PMID: 21038038 DOI: 10.1039/c0em00277a] [Citation(s) in RCA: 238] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Gas chromatography-isotope ratio mass spectrometry (GC-IRMS) has made it possible to analyze natural stable isotope ratios (e.g., (13)C/(12)C, (15)N/(14)N, (2)H/(1)H) of individual organic contaminants in environmental samples. They may be used as fingerprints to infer contamination sources, and may demonstrate, and even quantify, the occurrence of natural contaminant transformation by the enrichment of heavy isotopes that arises from degradation-induced isotope fractionation. This review highlights an additional powerful feature of stable isotope fractionation: the study of environmental transformation mechanisms. Isotope effects reflect the energy difference of isotopologues (i.e., molecules carrying a light versus a heavy isotope in a particular molecular position) when moving from reactant to transition state. Measuring isotope fractionation, therefore, essentially allows a glimpse at transition states! It is shown how such position-specific isotope effects are "diluted out" in the compound average measured by GC-IRMS, and how a careful evaluation in mechanistic scenarios and by dual isotope plots can recover the underlying mechanistic information. The mathematical framework for multistep isotope fractionation in environmental transformations is reviewed. Case studies demonstrate how isotope fractionation changes in the presence of mass transfer, enzymatic commitment to catalysis, multiple chemical reaction steps or limited bioavailability, and how this gives information about the individual process steps. Finally, it is discussed how isotope ratios of individual products evolve in sequential or parallel transformations, and what mechanistic insight they contain. A concluding session gives an outlook on current developments, future research directions and the potential for bridging the gap between laboratory and real world systems.
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Affiliation(s)
- Martin Elsner
- Institute of Groundwater Ecology, Helmholtz Zentrum München - German Research Center for Environmental Health, Ingolstädter Landstr. 1, 85764, Neuherberg, Germany.
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