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Determination of trace Cu(Ⅱ) in river water by spectrophotometry after cloud point with 5-Br-PADAP

XIAO Xue-ming,HUANG Hui,GUO Yu-ping (Department of Chemical and Bio-engineering,Sanming Univertity,Sanming 365004,Fujian,China)  
Aim To determine trace Cu(Ⅱ) in water from Shaxi River,Sanming City,Fujian,China and help to monitor pollutants in the river.Methods The cloud point method was proposed to extract and preconcentrate Cu(Ⅱ) in the river water.At pH 6.8 phosphoric acid buffer solution,the analyte Cu(Ⅱ) is complexed with 5-Br-PADAP {2-(5-bromo-2-pyridylazo)-5-diethylaminophenol}.Triton X-114 is added as a surfactant,in the presence of Triton X-114 the complex is soluble in water.The enriched analyte was determined by spectrophotometric methods.Results The maximum wave-length of absorption of the complex is 556 nm,ε=3.204×105 L·mol-1·cm-1.The detection limit is 0.011 2 μg·mL-1.Analytical graphs are linear relation in the concentration range of 0~0.4 μg·mL-1.Conclusion The method is sensitive,stable,simple,reproducible and relatively free from interference from co-existing species.It was successfully applied to the determination of Cu(Ⅱ) in every kinds of water samples.The analytical results of synthetic samples are satisfactory,with relative standard deviations of six determinations of 1.01%.
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