The behaviour of the title substances, which are components of the commercial plant growth stimulator Sviton, in differential pulse voltammetry at a hanging mercury drop electrode was studied and the optimum conditions were established for their quantitation over the concentration region of 1 .10-7 to 1 .10-5 mol l-1. Additional decrease in the limit of determination was achieved in adsorptive stripping voltammetry, by which 4-nitrophenol and 2-nitrophenol can be determined within the concentration regions of 2 .10-10 to 1 .10-7 and 2 .10-8 to 1. 10-7 mol l-1, respectively, and 2,4-dinitrophenol and 2-methoxy-5-nitrophenol within the region of 2 .10-9 to 1 .10-7 mol l-1.
1220 BAREK ET AL. its determination by tast polarography in the concentration range of 2-100 pmol I-', differential pulse polarography at a dropping mercury electrode in the concentration range of 0.2-100 pmol I-', Merentid pulse voltammetry at a hangmg mercury drop electrode in the concentration range of 0.02-10 pmol I-' and adsorptive stripping voltammetry in the concentration range of0.2-100 nmol I-'.
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