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Original Article Potassium Hydrogen Sulphate - A New Ionic Strength Adjustor for Determination of Nitrate in Potable Waters and Denitration Plant Effluents using Ion Selective Electrode

An Ion Selective Electrode (ISE) method using potassium hydrogen sulphate (KHSO4) as a new ionic strength adjustor (ISA) is described for the rapid determination of nitrate in potable waters and in the denitration plant effluents. Effluent samples containing ammonium nitrate (in the concentration range of 0.1-150 g L -1 ), generated during the denitration plant operations and potable water samples from Anantpur district were analyzed by this method. Nitrate could be quantified in the range of 5-1000 mgL -1 with a detection limit of 1.5 mgL -1 . The calibration slope was found to be 54.3±1.1 mV/decade concentration of nitrate. In the case of potable water samples, the interferences from bicarbonate, nitrite, carbonate, sulphate and phosphate were found to be insignificant. Chloride concentration greater than 100 mgL -1 notably affected the nitrate measurement. A column separation step was employed for chloride removal prior to the analysis. Standard addition method applied to samples showed > 95 % recovery. The relative standard deviation (RSD) was found to be between 4-6% (for n = 6). The results obtained by this method showed good agreement with those obtained by ion chromatography technique (R 2 = 0.99). The analysis throughput using ion selective electrode (ISE) was 20 samples per hour.