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Chemical Education Today
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Letters
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Using Periodate with Nitrite Solutions for Capillary Electrophoresis (J.
Chem. Educ. 1998, 75, 1588-1590)
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Gregorio Cruz
Research Chemist, Badajoz, Spain
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October 2003
Vol. 80 No. 10
p. 1138
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In the article “Determination of Nitrate and Nitrite in Water by Capillary Electrophoresis” (1), Hage et al. describe a method for analyzing both nitrate and nitrite using this relatively recent technique (CE). Nitrite solutions are oxidized to nitrate by such oxidants as permanganate or peroxides. Using sodium periodate, a strong oxidizer, as internal standard is therefore a potential problem. Thus, one can argue that when no nitrites appear in an assay this might be due, apart from the sensitivity of detection, to the oxidation of nitrite during sample preparation and the CE procedure. Typical limits for nitrite in drinking water are 0.5 mg/L (e.g., EU Council Directive 98/83/EC; see ref 2 ). For such levels, spectrophotometry gives good sensitivity. Ionic chroma-tography and modern polarography are other techniques used by water analysts. Literature Cited- Hage, D. S.; Chattopadhyay, A.; Wolfe, C. A. C.; Grundman, J.; Kelter, P. B. J. Chem. Educ. 1998, 75, 1588–1590.
- EU Council Directive 98/83/EC (accessed Jul 2003).
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| More Information |
 Citation |
Cruz, Gregorio. J. Chem. Educ. 2003 80 1138.
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Keywords |
Analytical Chemistry; Electrochemistry; Environmental Chemistry; Instrumental Methods; Laboratory Instruction; Quantitative Analysis
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History |
Created:
Last Updated: |
September 2, 2003
February 28, 2005
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