ULTRA TRACE SPECTROPHOTOMETRIC DETERMINATION OF CHROMIUM IN PRESENCE OF CATIONIC MICELLAR SOLUTION

H. KHAN, F. N. TALPUR, A. SHAH, A. BALOUCH

Abstract


A  very  simple,  fairy  selective,  direct  and  fast  spectrophotmetric  method is offered  for the analysis of chromium(VI) with 1,5-diphenylthiocarbazone (dithizone). Dithizone worked as a new spectrophotometric reagent in fairly acidic (0.003-0.012M H2SO4) micellar media with max = 520nm. The existence of micelle reduces the cost, avoids the earlier solvent extraction steps and  increasing the selectivity, sensitivity. 0.05 – 10 mg L-1 was the observed linear calibration graphs for Cr(VI) with the 1:3 (CrVI: dithizone) stoichiometric composition of the chelate. 20 ng cm-2 and 1.2×105 L mol-1cm-1 were the obtained average Sandell’s sensitivity and molar absorption coefficient for Cr(VI), respectively. The effect of more than 50 complexing agents, anions and cations, and has been analyzed at 1 mg L-1 of Cr(VI). The developed procedure was productively employed in the measurement of Cr(VI) in numerous complex synthetic mixtures, environmental waters (polluted and potable) and soil samples.

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