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Monitoring of nitrite, nitrate, chloride and sulfate in environmental samples using electrophoresis microchips coupled with contactless conductivity detection

This report describes the development of an analytical methodology on microchip electrophoresis (ME) devices coupled with capacitively coupled contactless conductivity detection (C4D) to monitor inorganic anions in environmental samples. The buffer composition as well as detection operating paramete...

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Bibliographic Details
Published in:Talanta (Oxford) 2016-01, Vol.147, p.335-341
Main Authors: Freitas, Camilla Benevides, Moreira, Roger Cardoso, de Oliveira Tavares, Maria Gizelda, Coltro, Wendell K.T.
Format: Article
Language:English
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Summary:This report describes the development of an analytical methodology on microchip electrophoresis (ME) devices coupled with capacitively coupled contactless conductivity detection (C4D) to monitor inorganic anions in environmental samples. The buffer composition as well as detection operating parameters were optimized to achieve the best separation selectivity and detector sensitivity, respectively. Electrophoretic separations of Cl−, NO3−, SO42− and NO2− were successfully performed within 60s using a running buffer composed of 30mmolL−1 latic acid and 15mmolL−1l-histidine (His). The best detectability levels were found applying a sinusoidal wave with 1100-kHz-frequency and 60-Vpp amplitude. Quantitative analyzes of inorganic anions were carried out in the presence of Cr2O72− ion as internal standard (IS), which ensured great repeatability in terms of migration times (
ISSN:0039-9140
1873-3573
DOI:10.1016/j.talanta.2015.09.075