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Aspectrophotometric determinationmethod for microamount of zirconium with anew chromogenic reagent DBMCA is de-scribed. In 1.6 mol/L HCl medium thereagent reacts with zirconium to form a 3:1blue complex, The molar absorptivity is 3.7¡Á10£þ4L¡¤mol£þ(-1)¡¤cm£þ(-1) at 640nm, Beer's lawis obeyed for 0¡«15¦Ìg of zirconium in 25mLsolution.
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    In 0. 24 mol¡¤L£þ(-1)H_(3)PO_(4) medium,barium reacts with the reagentto form a blue complex which has an absorpionmaximum at 632 nm with a molar absorptivityof 7, 31¡Á 10£þ4 L¡¤mol£þ(-1). cm£þ(-1).
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    Gallium forms a blue complex with 1,5-di-(2-hydroxy-5-sulfophenyl)-3-cyanoformazan disodium salt(DSPCF)at PH 4(HAc-NaAc buffer).
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    A 1¡Ã1 blue complex of bromosulfonazo(¢ó) and Ba(¢ò) was fromed in a wide range of acid media.
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    A color-reaction of bismuth with arsenazo ¢ó is investigated. A blue complex was formed in the medium of HClO_4 (0.50 mol/L). The molar absorptivity of the complex is 1.7210~4 L/(molcm) at 606 nm.
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