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2.1 Solubilized nitrate is determined potentiometrically using a nitrate ion-selective electrode (ISE) in conjunction with a double-junction reference electrode and a pH meter with an expanded millivolt scale (mV), or an ISE meter capable of being calibrated directly in terms of nitrate concentration. 2.2 Standards and samples are mixed 50:1 (v/v) with an ionic strength adjustment solution. Calibration is performed by analyzing a series of standards and plotting mV vs. nitratenitrogen concentration on semilog paper, or by calibrating the ion meter directly in terms of nitrate concentration.
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