Stability Constants of Cobalt(II) and Copper(II) Complexes with 3-[(o-Carboxy-p-nitrobenzene)azo]chromotropic Acid and Selective Determination of Copper(II) by Competition Coordination
نویسندگان
چکیده
A method for selective determination of copper(II) based on the reactions of copper(II) or cobalt(II) with 3(o-carboxy-p-nitrobenzene)azo chromotropic acid (CNBAC) at pH = 11.4 was developed. Results have shown that two complexes, Co(CNBAC)2 and Cu(CNBAC), were formed, whose cumulative stability constants were 5.22 10 and 7.61 10 dm mol, respectively, and their molar absorption coefficients were 1.19 10 and 2.12 10 dm mol cm at 610 nm. The competition coordination of Cu and Co with CNBAC was applied for selective determination of Cu by the spectral correction technique. In the absence of any masking reagent, the recommended method was selective and was applied for quantitative determination of copper(II) in river and waste water samples.
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