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- W2490068072 abstract "The kinetics of reduction of Cr(VI) by thiourea has been studied spectrophotometrically in an HClO 4 medium. The reaction follows overall third order kinetics, first order each in Cr(VI), thiourea and HClO 4 . The reactionis HClO 4 catalyzed. Addition of Mn(II) and Ce(IV) ions largely decrease the reaction rate. The reaction rate is increased by addition of EDTA. The spectrophotometric study indicates that the reduction of chromium(VI) follows the sequence formula math. where, R=reductant (thiourea). The reaction is considered to proceed through the formation of a ternary EDTA-chromium(VI)-thiourea complex which decomposes giving the reduced Cr(IV)-EDTA complex, followed by fast reduction with thiourea. The reduction products of chromium(VI) have been found to be Cr(III)-thiourea (λ m a x = 425 and 600 nm) and cr(III)-EDTA (λ m a x = 410 and 550 nm), respectively, in the absence and presence of EDTA." @default.
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- W2490068072 date "2004-05-01" @default.
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- W2490068072 title "A kinetic study of the reduction of chromium(VI) by thiourea in the absence and presence of manganese(II), cerium(IV) and ethylenediaminetetra acetic acid (EDTA)" @default.
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