Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5142205 | Arabian Journal of Chemistry | 2016 | 5 Pages |
Abstract
In the present work, a sensitive, and simple kinetic method was developed for the determination of trace amounts of Mo(VI) based on its catalytic effect on the oxidation of 4-Amino-3-hydroxy-naphthalenesulfonic acid (AHNA) with H2O2. To optimize the parameters affecting the aforementioned system, the reaction was followed spectrophotometrically by tracing the oxidized product at 475 nm. The absorption of the solution in the presence and absence of the molybdenum ion in different conditions was compared. The optimum reaction conditions were: 9 mmol Lâ1 AHNA, 35 mmol Lâ1 H2O2, 27 mmol Lâ1 acetate buffer with pH = 5.3 at temperature 40 °C for 30 min. A 0.02% (w/v) di-ethylene tri-amine penta acetic acid (DTPA) was used as a masking reagent for confirming selectivity. The calibration curve was linear in the range 0.1-4.0 ng mLâ1 with a correlation coefficient of 0.999 and the detection limit was 0.04 ng mLâ1 (n = 15) based on the 3Ïbl/m. The proposed method was used for the determination of molybdenum in the different water and waste water samples.
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Authors
Abdolreza Iraj Mansouri, Mohammad Mirzaei, Daryoush Afzali, Farideh Ganjavie,