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Abstract
A method is presented that allows the determination of trace amounts of nitrate in 1 M potassium chloride extracts of environmental soil samples from Northern Europe. To avoid the interference of bromine ions on the evaluation of the nitrate peak, 50 µL of a 50 mg/L nitrate standard solution are added to a 5 mL soil extract. This makes sure that the overall nitrate concentration in the spike is >500 µg/L which allows an exact and reliable determination of the nitrate concentration. Analyses of the soil extracts are carried out by anion-exchange HPLC with ultra-violet detection at λ = 210 nm using 0.1 M KCl as eluent. Concentrations down to 25 µg/L of nitrate can be analyzed.