 ISSN 0235-7216 ISSN 2424-4538 (online) |
2008 m. Nr. 2 Tetrazolium violet – a new spectrophotometric reagent for molybdenum determination
The interaction of Mo(VI) and tetrazolium violet (TV) has been examined. The ion-associate formed is extracted into 1,2-dichloroethane. The tetrazolium violet : molybdenum(VI) : 3,4,5-trihydroxybenzoic acid ratio (R) is 2 : 1 : 2. The optimum conditions have been established. Beer’s law is obeyed in the range of 0.2–5 μg ml–1 molybdenum(VI). The molar absorptivity of the complex is (1.30 ± 0.08) × 105 L mol–1 cm–1. The sensitivity of the method is 7.4 × 10–4 μg cm–2. It is possible to extract and determine molybdenum in the presence of a large number of cations and anions. The characteristic values for the extraction and the aqueous phase equilibria were determined. A sensitive and selective method for determination of molybdenum(VI) microquantities in soils has been developed. Keywords: molybdenum determination, extraction-spectrophotometry, tetrazolium violet, soils |
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