This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Diamond Thin-Film Electrodes for Monitoring Heavy Metal Ions in Water Supplies Using Anodic Stripping Voltammetry
Technical Paper
2005-01-2888
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Conductive diamond is a new electrode material that functions well in anodic stripping voltammetry (ASV); a technique used for the determination of heavy metal ions in aqueous media. Work to adapt a previously developed ground-based method for targeted use onboard the International Space Station (ISS) is the subject of this paper. It is demonstrated that increasing the solution pH from 4.5 to 5.2 (a value near that acceptable for on-board use) did not cause significant alteration in the detection figures of merit for five priority metal ions (Ag(I), Cu(II), Pb(II), Cd(II) and Zn(II)). It is also shown that the addition of Ca(II) and Mg(II) salts at concentrations identical to those presently used in the potable water caused less than a 4% change in the signal obtained for most of the priority metal ions tested. Finally, elimination of the deoxygenation step (nitrogen purge) did not affect the signals for Ag(I) and Cd(II), but did cause a decrease in the signals for Pb(II) and Cu(II). Even with the decreased signals, though, a linear calibration curve was still obtained for Pb(II) with a detection limit of 50 ppb. The long-term electrode response stability for Cd(II) is also reported on. The signal remained constant (RSD ~5%) over a period of several weeks. The method was applied to the analysis of Ag(I) in simulated potable and technical water samples. Analysis of Ag(I) in the potable water sample yielded a result of 430 ± 2 ppb, which is within 2% of the expected value of 422 ppb. Analysis of Ag(I) in the technical water sample yielded a result of 530 ± 16 ppb, which is 9% higher than the expected value of 480 ppb.
Recommended Content
Technical Paper | ISS Potable Water Sampling and Chemical Analysis: Expeditions 4 & 5 |
Technical Paper | Quality of Water Supplied by Shuttle to ISS |
Technical Paper | Chemical Sampling and Analysis of ISS Potable Water: Expeditions 1-3 |
Authors
Topic
Citation
McGaw, E., Sonthalia, P., and Swain, G., "Diamond Thin-Film Electrodes for Monitoring Heavy Metal Ions in Water Supplies Using Anodic Stripping Voltammetry," SAE Technical Paper 2005-01-2888, 2005, https://doi.org/10.4271/2005-01-2888.Also In
References
- Plumlee, D.K. Mudgett, P.D. Schultz, J.R. Chemical Sampling and Analysis of ISS Potable Water: Expeditions 1–3 32 nd International Conference on Environmental Systems, SAE 2002-01-2537. San Antonio , TX July 2002
- Mudgett, P.D. Benoit, M.J. Schultz, J.R. Quality of Water Supplied by Shuttle to ISS 32 nd International Conference on Environmental Systems, SAE 2002-01-2532. San Antonio , TX July 2002
- Plumlee, D.K. Mudgett, P.D. Schultz, J.R. ISS Potable Water Sampling and Chemical Analysis: Expeditions 4 & 5 33 rd International Conference on Environmental Systems, SAE 2003-01-2401. Vancouver , BC July 2003
- Swain, G. M. Electroanalytical Chemistry Bard, A.J. Rubinstein, I. Marcel Dekker, Inc. 22 2004 181 277
- Show, Y. Witek, M.A. Sonthalia, P. Swain, G.M. Characterization and Electrochemical Responsiveness of Boron-Doped Nanocrystalline Diamond Thin-Film Electrodes, Chem. Mater 2003 15 879
- Sonthalia, P. McGaw, E. Show, Y. Swain, G.M. Metal Ion Analysis in Contaminated Water Samples using Anodic Stripping Voltammetry and Nanocrystalline Diamond Thin-film Electrodes Anal. Chim. Acta 2004 522 35
- Fischer, A.E. Show, Y. Swain, G. M. Electrochemical Performance of Diamond Thin-Film Electrodes from Different Commercial Sources Anal. Chem 2004 76 2553