Determination of Trace Copper (Ⅱ) in Water Samples by Kinetic-spectrophotometry

查看全文 作　　者：QI Yanxia JI Hongwei XIN Huizhen LIU [1]Li

机构地区：[1]College of Chemistry and Chemical Engineering, Key Laboratory of Marine Chemistry Theory and Technology, the Ministry of Education, Ocean University of China, Qingdao 266100, P. R. China

出　　处：《Journal of Ocean University of China》索引2007年第6卷第2期,共4页

摘　　要：A new kinetic-spectrophotometric method is proposed for the determination of copper (Ⅱ). The method is based on the catalytic effect of copper (Ⅱ) on the oxidation of weak acid brilliant blue dye (RAWL) by hydrogen peroxide. The copper (Ⅱ) can be determined spectrophotometrically by measuring the decrease of absorbance of RAWL at λ = 626 nm using the fix-time method. The optimum reaction conditions are as follows: pH 7.20, buffer solution NaOH-KH2PO4, RAWL (200 mg L-1) 5.00 mL, H2O2 (30%) 0.50 mL, reaction temperature 80℃ and reaction time 20 min. The linear range of this method is between 0 μg L-1 and 12 μg L-1 and the limit of detection is 0.011 μg L-1, the relative standard deviation (RSD) in five replicate determinations for 2 and 8 μg L-1 copper (Ⅱ) are 3.2% and 2.3%, respectively. Twenty ions do not interfere in the determination of copper (Ⅱ). The method has been applied satisfactorily to the determination of copper (Ⅱ) in freshwater samples (tap water and Yellow River water from Lijin, Shandong, China) and seawater samples (from the South China Sea), the recovery rates are 98.0%, 102.5% and 96.0%, respectively. 关键词：海水水样痕量铜分析方法动态分光光度法

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Determination of Trace Copper (Ⅱ) in Water Samples by Kinetic-spectrophotometry

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