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The synthesis and purification procedure of dibromo-p-methyl-chlorosulphonazo (DBMCSA) chromogenic agent have been described. This agent was used for spectropho-tometric determination of lead. In 0.16 mol L-1 nitric acid solution lead reacts with DBMCSA to form a 1:2 blue-coloured complex of maximum absorbance at 633 nm. Under the optimum conditions Beer's law was obeyed over Pb(II) concentration...
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