Determination of Nitrate-Nitrogen in Water Using a Coated Wire Electrode
Goodroad, L. L.
Shuman, Larry M.
Pitts, R. B.
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Monitoring nitrate (N0 ) in water has important implications to public health and environmental quality. Of the analytical methods available, ion selective electrodes have potential for simple, rapid determination of N0 concentrations in water. Use of ion selective electrodes has been limited due to interference by a variety of ions, relatively high detection limits, and short operational lifetimes (Tabatabi and Dick, 1983). According to Langmuir and Jacobson (1970) chloride (Cl) and bicarbonate (HC0) were the chief interfering anions in most waters when using a commercially available liquid junction N0 specific electrode. Lee et al (1986) described a procedure for making coated wire nitrate-selective electrodes. In this paper, we report the characteristics of the coated wire N0 selective electrode and the possible application to N0 analysis in water.