K. Markusova et al., PROGRAMMED-POTENTIAL VOLTAMMETRIC DETERMINATION OF NITRATE AT A STATIC MERCURY DROP ELECTRODE IN NATURAL-WATERS AND SOIL EXTRACTS, Electroanalysis, 8(6), 1996, pp. 582-584
Linear-scan or differential pulse voltammetry with electrode surface m
odified at a mercury drop presweep potential of -1.8 V is used for the
determination of nitrate in the presence of trivalent cations. The me
thod has been applied to the determination of nitrate in drinking and
riverwaters, and in soil extracts with determination limit of 0.3 mu M
(20 mu g L(-1)).