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《Metallurgical Analysis》 2008-09
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Spectrophotometric determination of trace germanium with 1,5-di(2-hydroxy-5-chlorophenyl)-3-cyanoformazane

CHEN Wen-bin,MA Wei-xing,XU Xing-you,XU Guo-xiang (Department of Chemical Engineering,Huaihai Institute of Technology,Lianyungang 222005,China)  
The color reaction of chromogenic agent 1,5-di(2-hydroxy-5-chlorophenyl)-3-cyanoformazane(HCPCF) with Ge  was studied in the presence of cetyltrimethylammonium bromide(CTMAB).A novel spectrophotometric determination of trace Ge with high sensitivity was established.The results showed that the color agent could form a stable blue complex with Ge in Na2B4O7-NaOH buffer solution at pH 10.0 and the molar ratio of reagent∶metal was 4∶1.The maximum absorption peak of the complex was located at 632 nm with the apparent molar absorptivity of 2.7×105 L·mol-1·cm-1.Beer's law was obeyed in the concentration range of 0.002-0.32 μg/mL for Ge.The detection limit of this method was 0.80 mg/ mL.After eliminating the interference by extracting and separating Zn with sodium diethyl dithiocarbamate-carbon tetrachloride(DDTC-CCl4),the method is applied to the determination of trace Ge in zinc concentrate with the recovery of 103.7%-104.6% and the RSD of lower than 3%(n=6).
【Fund】: 淮海工学院海洋生物技术重点建设实验室基金项目(2005HS010 2005HS001);; 江苏省科技厅自然科学基金(BK2005045);; 淮海工学院自然科学基金(Z2006001)
【CateGory Index】: O614.338
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