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《Journal of Baoji College of Arts and Science(Natural Science Edition)》 2005-03
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Spectrophotometric and catalytic determination of trace amounts of copper with the system of H_2O_2 and alizarin

SHA Ren (Coll. Chem. & Envmt. Sci., Inner Mongolia Normal Univ., Hohhot 010022, Inner Mongolia, China)  
A new system was investigated for the determination of trace Cu(Ⅱ) with the kinetic spectrophotometric method. Buffer medium is ammonia and ammonia chloride solution (pH=10.0). It had been found that the decolouring oxidation of alizarin by hydrogen peroxide using trace Cu(Ⅱ) as catalyst was investigated. The suitable condition and kinetic character were studied. A new spectrophotometric method for the determination of trace Cu(Ⅱ) was developed. The selectivity of the method is relatively high. Many foreign ions don't interfere with the determination of Cu(Ⅱ). The linear range is 0~1.2×10 -7 g/mL. A detection limit of 1.76×10 -10 g/mL. The measurement of trace Cu(Ⅱ)was applied to agricultural product samples and Mongolian medicine samples. The relative standard deviations (RSD) were between 1.1%~3.2%.
【Fund】: 内蒙古自然科学基金资助项目(200408020213)
【CateGory Index】: O657.3
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