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Solihat NN, Acter T, Kim D, Plante AF, Kim S. Analyzing Solid-Phase Natural Organic Matter Using Laser Desorption Ionization Ultrahigh Resolution Mass Spectrometry. Anal Chem 2018; 91:951-957. [DOI: 10.1021/acs.analchem.8b04032] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Nissa Nurfajrin Solihat
- Department of Chemistry, Kyungpook National University, Daegu 41566, Republic of Korea
- Research Center for Biomaterials, Indonesian Institute of Sciences (LIPI), Cibinong 16911, Indonesia
| | - Thamina Acter
- Department of Chemistry, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Donghwi Kim
- Department of Chemistry, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Alain F. Plante
- University of Pennsylvania, 240 South 33rd Street, Philadelphia, Pennsylvania 19104, United States
| | - Sunghwan Kim
- Department of Chemistry, Kyungpook National University, Daegu 41566, Republic of Korea
- Green-Nano Materials Research Center, Daegu 41566, Republic of Korea
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Schittich AR, Wünsch UJ, Kulkarni HV, Battistel M, Bregnhøj H, Stedmon CA, McKnight US. Investigating Fluorescent Organic-Matter Composition as a Key Predictor for Arsenic Mobility in Groundwater Aquifers. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:13027-13036. [PMID: 30339396 DOI: 10.1021/acs.est.8b04070] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Dissolved organic matter (DOM) is linked to the heterogeneous distribution of elevated arsenic (As) in groundwater used for drinking and irrigation purposes, but the relationship between DOM characteristics and arsenic mobility has yet to be fully understood. Here, DOM from groundwater sampled in the Bengal Basin region was characterized using both conventional bulk emission-excitation (EEM) spectroscopy and high-performance size-exclusion chromatography coupled to spectroscopy (HPSEC-EEM). Notably, application of the novel HPSEC-EEM approach permitted the total fluorescence of individual samples to be independently resolved into its underlying components. This allowed the external validation of the bulk-sample fluorescence decomposition and offered insight into the molecular size distribution of fluorescent DOM. Molecular size distributions were similar for the UVA fluorescent (C310 and C340) as well as the three visible fluorescent (C390, C440, and C500) components. There was a greater visible fluorescence in shallow aquifer samples (10-33 m) with high As (SH, up to 418 μg/L) than in samples from the same depth with lower As (up to 40 μg/L). This indicated a link between DOM quality and As mobility within the shallow aquifer. The deep aquifer samples (170-200 m) revealed DOM characteristics similar to SH samples but had low As concentrations (<4 μg/L), signifying that the deep aquifer is potentially vulnerable to As contamination. These findings pave the way for a more comprehensive assessment of the susceptibility of drinking water aquifers, thereby supporting the management of groundwater resources.
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Affiliation(s)
- Anna-Ricarda Schittich
- Department of Environmental Engineering , Technical University of Denmark , Bygningstorvet, Building 115 , 2800 Kongens Lyngby , Denmark
| | - Urban J Wünsch
- Water Environment Technology , Chalmers University of Technology, Architecture, and Civil Engineering , Sven Hultins Gata 6 , 41296 Gothenburg , Sweden
- National Institute of Aquatic Resources , Technical University of Denmark , Kemitorvet, Building 202 , 2800 Kongens Lyngby , Denmark
| | - Harshad V Kulkarni
- Department of Geology , Kansas State University , Manhattan , Kansas 66502 , United States
| | - Maria Battistel
- Department of Environmental Engineering , Technical University of Denmark , Bygningstorvet, Building 115 , 2800 Kongens Lyngby , Denmark
| | - Henrik Bregnhøj
- School of Global Health , University of Copenhagen , 1353 Copenhagen K , Denmark
| | - Colin A Stedmon
- National Institute of Aquatic Resources , Technical University of Denmark , Kemitorvet, Building 202 , 2800 Kongens Lyngby , Denmark
| | - Ursula S McKnight
- Department of Environmental Engineering , Technical University of Denmark , Bygningstorvet, Building 115 , 2800 Kongens Lyngby , Denmark
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Hawkes JA, Radoman N, Bergquist J, Wallin MB, Tranvik LJ, Löfgren S. Regional diversity of complex dissolved organic matter across forested hemiboreal headwater streams. Sci Rep 2018; 8:16060. [PMID: 30375497 PMCID: PMC6207752 DOI: 10.1038/s41598-018-34272-3] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2018] [Accepted: 10/03/2018] [Indexed: 11/30/2022] Open
Abstract
Dissolved organic matter (DOM) from soils enters the aquatic environment via headwater streams. Thereafter, it is gradually transformed, removed by sedimentation, and mineralised. Due to the proximity to the terrestrial source and short water residence time, the extent of transformation is minimal in headwaters. DOM has variable composition across inland waters, but the amount of variability in the terrestrial end member is unknown. This gap in knowledge is crucial considering the potential impact large variability would have on modelling DOM degradation. Here, we used a novel liquid chromatography –mass spectrometry method to characterise DOM in 74 randomly selected, forested headwater streams in an 87,000 km2 region of southeast Sweden. We found a large degree of sample similarity across this region, with Bray-Curtis dissimilarity values averaging 8.4 ± 3.0% (mean ± SD). The identified variability could be reduced to two principle coordinates, correlating to varying groundwater flow-paths and regional mean temperature. Our results indicate that despite reproducible effects of groundwater geochemistry and climate, the composition of DOM is remarkably similar across catchments already as it leaves the terrestrial environment, rather than becoming homogeneous as different headwaters and sub-catchments mix.
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Affiliation(s)
- Jeffrey A Hawkes
- Analytical Chemistry, Department of Chemistry - BMC, Uppsala University, Uppsala, Sweden.
| | - Nikola Radoman
- Analytical Chemistry, Department of Chemistry - BMC, Uppsala University, Uppsala, Sweden.,Department of Environmental Science and Analytical Chemistry, Stockholm University, Stockholm, Sweden
| | - Jonas Bergquist
- Analytical Chemistry, Department of Chemistry - BMC, Uppsala University, Uppsala, Sweden
| | - Marcus B Wallin
- Department of Earth Sciences, Uppsala University, Uppsala, Sweden
| | - Lars J Tranvik
- Limnology, Department of Ecology and Genetics, Uppsala University, Uppsala, Sweden
| | - Stefan Löfgren
- Department of Aquatic Sciences and Assessment; Section for Geochemistry and Hydrology, Swedish University of Agricultural Sciences (SLU), Uppsala, Sweden
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Kim D, Lee J, Kim B, Kim S. Optimization and Application of Paper-Based Spray Ionization Mass Spectrometry for Analysis of Natural Organic Matter. Anal Chem 2018; 90:12027-12034. [DOI: 10.1021/acs.analchem.8b02668] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Donghwi Kim
- Department of Chemistry, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Joonhee Lee
- Center for Analytical Chemistry, Division of Chemical & Medical Metrology, Korea Research Institute of Standards and Science, Daejeon 34113, Republic of Korea
| | - Byungjoo Kim
- Center for Analytical Chemistry, Division of Chemical & Medical Metrology, Korea Research Institute of Standards and Science, Daejeon 34113, Republic of Korea
| | - Sunghwan Kim
- Department of Chemistry, Kyungpook National University, Daegu 41566, Republic of Korea
- Green-Nano Materials Research Center, Daegu 41566, Republic of Korea
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