Determination of nitrite in aqueous solutions using the linear sweep voltammetry technique
Journal Article
·
· Analytical Letters
- Univ. Federal do Ceara, Fortaleza-Ceara (Brazil). Dept. de Quimica Analitica e Fisico-Quimica
The nitrite ion plays an important role in the chemistry of the environment since it can be present naturally or as a pollutant in waters and in other environmental materials. An electrochemical method using linear sweep voltammetry techniques was developed to determine nitrite ion in aqueous solution in the presence of nitrate. Nitrate solutions exhibited a well-defined oxidation wave at +1.0V vs SCE at vitreous carbon, while no oxidation process was observed for nitrate solutions. The pH of the nitrite solutions varied from 2.37 to 5.60 and no change was observed in the EP values, except for the pH 5.60 solution, where little change was verified. The potential also did not vary with change in the nitrite concentration in the 5.0 {times} 10{sup {minus}5} to 7.0 {times} 10{sup {minus}4} and L{sup {minus}1} range. Very good straight lines for plots of current versus nitrite concentration in the 7.0 {times} 10{sup {minus}5} to 7.0 {times} 10{sup {minus}4} mol L{sup {minus}1} range were obtained; the correlation coefficient was never worse than 0.990. The nitrite determination was also performed in the presence of 1.0 {times} 10{sup {minus}3} mol L{sup {minus}1} of NO{sub 3}{sup {minus}} ions. The addition of NO{sub 3}{sup {minus}} did not change significantly the current values even when it was added in one hundred times molar excess.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 351529
- Journal Information:
- Analytical Letters, Journal Name: Analytical Letters Journal Issue: 6 Vol. 32; ISSN ANALBP; ISSN 0003-2719
- Country of Publication:
- United States
- Language:
- English
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