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Iminostilbene As New Spectrophotometric Reagent For Determination Of Chromium(VI) In Soils And Industrial Effluents

Akheel Ahmed Syed, Salman Khan, D.A.Manoharan

New oxidative electrophilic coupling method is developed for spectrophotometric determination of trace amounts of chromium(VI) in soil and industrial effluent samples. The method is based on the reduction of chromium(VI) by an electrophilic coupling reagent, 3-methyl-2- benzothiozoline hydrazone hydrochloride hydrate(MBTH) which subsequently couples with iminostilbene(ISB) in acidic medium to form a green colored product having λmax at 700nm. The color is stable up to 24h and obeyed Beer’s law in the concentration range of 0.1-4.0μg ml-1. The optimum reaction conditions and other important analytical parameters are established to enhance the sensitivity of the proposed methods. Interference due to various non-target ions is also investigated. The proposed method can be applied to the analysis of chromium(VI) in selected soils and industrial effluents. The performance of proposed methods can be evaluated in terms of recovery tests by standard addition method and the results indicate the significance of proposed method over reference spectrophotometric method.