Voltammetric behavior of biologically active 5-nitrobenzimidazole (NB) and 2,4,6-trinitrophenol (TNP) was investigated using direct current voltammetry (DCV) and differential pulse voltammetry (DPV) at a polished Ag amalgam composite electrode (p-AgSA-CE). The optimum conditions were found for their determination in Britton- Robinson buffer of pH 5.0 and 2.0 for NB and TNP, respectively. Unfortunately, due to inferior repeatability of measurements, the voltammetric method for NB could not be developed. A probable reason is the formation of a complex of NB with the epoxy resin on the electrode surface. The TNP calibration curves were linear in the concentration ranges 0.1-100 μmol l -1 (DCV) and 2-100 μmol l -1 (DPV), with the limits of quantification (LQ) ≈ 0.1 and 1 μmol l-1 for DCV and DPV, respectively. The applicability of the DCV method was verified by direct determination of TNP in model samples of drinking and river water, with LQ ≈ 0.6 and 2 μmol l -1, respectively.
|Translated title of the contribution||Determination of ecotoxic nitro compounds using polished silver amalgam composite electrode|
|Number of pages||7|
|Publication status||Published - 1 Mar 2012|
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