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Čmelík J, Bábelová M. Determination of Nitrate and Fluoride in Spent Pickling Baths for Stainless Steel by Spectrophotometry and Potentiometry. ANAL LETT 2022. [DOI: 10.1080/00032719.2022.2036182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Affiliation(s)
- Jiří Čmelík
- ORLEN UniCRE, Revoluční 1521/84, Ústí nad Labem, Czech Republic
| | - Monika Bábelová
- ORLEN UniCRE, Revoluční 1521/84, Ústí nad Labem, Czech Republic
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Jothimuthu P, Hsu JL, Chen R, Inayathullah M, Pothineni VR, Jan A, Gurtner GC, Rajadas J, Nicolls MR. Enhanced Electrochemical Sensing with Carbon Nanotubes Modified with Bismuth and Magnetic Nanoparticles in a Lab-on-a-Chip. CHEMNANOMAT : CHEMISTRY OF NANOMATERIALS FOR ENERGY, BIOLOGY AND MORE 2016; 2:904-910. [PMID: 27857882 PMCID: PMC5110256 DOI: 10.1002/cnma.201600174] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Iron plays an especially important role in human physiological functions and pathological impairments. The superior properties of carbon nanotubes (CNTs) and their modification with bismuth and magnetic nanoparticles as developed in this work have led to an extraordinary and novel material to facilitate ultrasensitive detection in the nanomolar range. Here, we present the development of an electrochemical sensor for detection of ferrous (Fe2+) and ferric (Fe3+) iron by means of CNTs modified with bismuth and magnetic nanoparticles for higher sensitivity of detection. The sensor fabrication includes microfabrication methodologies, soft lithography, and electrodeposition. Cyclic voltammetry and differential pulse voltammetry are used for the electroanalytical studies and detection of the ions in samples. The sensor has a dynamic range of detection from 0.01 nm to 10 mm. The performance of the sensor with modified CNTs was explored for sensitivity and specificity. CNTs, modified with bismuth and magnetic nanoparticles by means of electrodeposition, enhanced the detection limit significantly down to 0.01 nm.
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Affiliation(s)
- Preetha Jothimuthu
- Biomaterials and Advanced Drug Delivery Laboratory, Stanford University, Stanford, CA, 94305 (USA)
| | - Joe L. Hsu
- Department of Medicine, Division of Pulmonary & Critical Care Medicine, VA Palo Alto/Stanford University, Stanford, CA, 94305 (USA)
| | - Robert Chen
- Stanford Nanofabrication Facility, Stanford, CA, 94305 (USA)
| | - Mohammed Inayathullah
- Biomaterials and Advanced Drug Delivery Laboratory, Stanford University, Stanford, CA, 94305 (USA)
| | | | - Antony Jan
- Department of Electrical Engineering, Stanford University, Stanford, CA, 94305 (USA)
| | - Geoffrey C. Gurtner
- Department of Surgery, Stanford University School of Medicine, Stanford, CA, 94305 (USA)
| | - Jayakumar Rajadas
- Biomaterials and Advanced Drug Delivery Laboratory, Stanford University, Stanford, CA, 94305 (USA)
| | - Mark R. Nicolls
- Department of Medicine, Division of Pulmonary & Critical Care Medicine, VA Palo Alto/Stanford University, Stanford, CA, 94305 (USA)
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Borman CJ, Sullivan BP, Eggleston CM, Colberg PJS. The use of flow-injection analysis with chemiluminescence detection of aqueous ferrous iron in waters containing high concentrations of organic compounds. SENSORS (BASEL, SWITZERLAND) 2009; 9:4390-406. [PMID: 22408532 PMCID: PMC3291917 DOI: 10.3390/s90604390] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2009] [Revised: 06/01/2009] [Accepted: 06/03/2009] [Indexed: 11/16/2022]
Abstract
An evaluation of flow-injection analysis with chemiluminescence detection (FIA-CL) to quantify Fe(2+) ((aq)) in freshwaters was performed. Iron-coordinating and/or iron-reducing compounds, dissolved organic matter (DOM), and samples from two natural water systems were used to amend standard solutions of Fe(2+) ((aq)). Slopes of the response curves from ferrous iron standards (1 - 100 nM) were compared to the response curves of iron standards containing the amendments. Results suggest that FIA-CL is not suitable for systems containing ascorbate, hydroxylamine, cysteine or DOM. Little or no change in sensitivity occurred in solutions of oxalate and glycine or in natural waters with little organic matter.
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Affiliation(s)
- Christopher J. Borman
- Department of Chemistry, University of Wyoming, Dept 3838, 1000 E. University Avenue, Laramie, Wyoming 82071, USA
| | - B. Patrick Sullivan
- Department of Chemistry, University of Wyoming, Dept 3838, 1000 E. University Avenue, Laramie, Wyoming 82071, USA
| | - Carrick M. Eggleston
- Department of Geology and Geophysics, University of Wyoming, Dept 3006, 1000 E. University Avenue, Laramie, Wyoming 82071, USA; E-Mail: (C.M.E.)
| | - Patricia J. S. Colberg
- Department of Civil and Architectural Engineering, University of Wyoming, Dept 3295, 1000 E. University Avenue, Laramie, Wyoming 82071, USA; E-Mail: (P.J.S.C.)
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