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  • Title: Synthesis of amido black diazoaminoazobenzene and its application to the spectrophotometric determination of micrograms of cadmium.
    Author: Zhang PF, Gao HW, Li Y.
    Journal: Talanta; 1998 Oct; 47(2):355-9. PubMed ID: 18967336.
    Abstract:
    A new azoamino reagent amido black diazoaminoazobenzene (ABDAB) has been synthesized, and found to be a good chromogenic reagent for cadmium. In pH 10.4 Na(2)B(4)O(7)NaOH buffer solution cadmium reacts with ABDAB to form an orange-red chelate (1:2), exhibiting an absorption maximum at 520 nm. The apparent molar absorptivity is 1.62x10(5) l mol(-1) cm(-1). Beer's law is obeyed in the range 0-8 mug/25 ml Cd. The method is simple and rapid, with high sensitivity and good selectivity and is applied to the determination of trace amounts of cadmium in waste water and metal materials with satisfactory results.
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