Determination of NTA and EDTA and Speciation of Their Metal Complexes in Aqueous Solution by Capillary Electrophoresis

Owens, Gary; Ferguson, Verity K.; McLaughlin, Michael J.; Singleton, Ian; Reid, Rob J.; Smith, F. A.

Abstract

The interest in the use of chelates for enhancing metal uptake by plants during phytoremediation and their widespread use in plant nutrient research requires that an easy, reproducible method be developed for chelate detection in a variety of systems. This work examined the use of capillary electrophoresis for chelate analysis. Electropherograms for nitrilotriacetic acid (NTA) and ethylenediaminetetraacetic acid (EDTA) and their metal complexes were obtained by capillary electrophoresis in a phosphate buffer by direct UV detection at 185 nm. The metals used were Ca(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II), Pb(II), and Fe(III). For the majority of metals studied, linear calibration curves were obtained in the concentration range of 10−1000 μM. The direct method of determination at 185 nm was found to give a higher detection sensitivity than direct detection at 254 nm. Limits of detection for the metal chelate complexes were in the range of 2−50 μM. The analysis was fast (

Citation

Owens, G., Ferguson, V. K., McLaughlin, M. J., Singleton, I., Reid, R. J., & Smith, F. A. (2000). Determination of NTA and EDTA and Speciation of Their Metal Complexes in Aqueous Solution by Capillary Electrophoresis. Environmental science & technology, 34(5), 885-891. https://doi.org/10.1021/es990309m

• Journal Article Type: Article
• Online Publication Date: Jan 21, 2000
• Publication Date: 2000-03
• Deposit Date: Aug 5, 2016
• Journal: Environmental Science & Technology
• Electronic ISSN: 0013-936X
• Publisher: American Chemical Society
• Peer Reviewed: Peer Reviewed
• Volume: 34
• Issue: 5
• Pages: 885-891
• DOI: https://doi.org/10.1021/es990309m
• Keywords: Chemistry(all); Environmental Chemistry
• Public URL: http://researchrepository.napier.ac.uk/Output/328293