Adsorptive Voltammetric Determination of Copper by the Reaction of Cu(Ⅱ)-ARS Complex at Carbon Paste Electrode
摘 要
基于铜(Ⅱ)-茜素红S络合物在碳糊电极上的还原波,提出了吸附伏安法测定痕量铜的方法.在极谱分析仪上采用二次导数线性扫描伏安法进行分析,在含有1.0×10-5mol·L-1茜素红S的pH 4.0的乙酸-乙酸钠缓冲介质中,当富集电位为0 mV,富集时间为180 s,扫描速率为100 mV·s-1时,铜(Ⅱ)-茜素红S络合物吸附在碳糊电极表面,于-316 mV(vs.SCE)处产生一灵敏的还原峰,络合物的峰电流与铜(Ⅱ)的浓度在1.0×10-9~2.0×10-7mol·L-1范围内呈线性关系,检出限(3S/N)为6.0×10-10mol·L-1.方法用于锌合金中铜的测定,测定值的相对标准偏差(n=7)均小于3.5%.用标准加入法进行了回收试验,测得回收率在96.0%~102.0%之间.
Abstract
In an acetate buffer of pH 4.0,a complex of Cu(Ⅱ)-ARS was formed through the reaction of Cu(Ⅱ) ion with alizarin red S (ARS in short) with its concentration of 1.0×10-5mol·L-1.The adsorptive voltammetric behavior of the Cu(Ⅱ)-ARS complex at the carbon paste electrode was studied under the conditions of accumulation at the potential of 0 mV for 180 s and of rate of scanning at 100 mV·s-1,a sensitive reduction peak was observed at -316 mV (vs.SCE) due to adsorption and stripping of the copper complex on and from the surface of the electrode.Linear relationship between values of 2nd derivatives of the stripping peak current and concentration of Cu(Ⅱ) ion was kept in the range of 1.0×10-9-2.0×10-7mol·L-1.Detection limit (3S/N) found for the method was 6.0×10-10mol·L-1.The proposed method was applied to the determination of copper contents in samples of zinc alloys,giving values of RSD′s (n=7) less than 3.5%.Recovery of the method was tested by standard addition method,and values of recovery found were in the range from 96.0%-102.0%.
中图分类号 O657.1
所属栏目 工作简报
基金项目 衡阳市科学技术局科技项目(2007KJ001)和衡阳师范学院科学基金青年项目(07A19)
收稿日期 2008/3/16
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备注邓培红(1975-),女,广西南宁人,硕士,讲师,主要从事电分析化学研究.
引用该论文: DENG Pei-hong,ZHANG Jun,LI Ju-nan. Adsorptive Voltammetric Determination of Copper by the Reaction of Cu(Ⅱ)-ARS Complex at Carbon Paste Electrode[J]. Physical Testing and Chemical Analysis part B:Chemical Analysis, 2009, 45(8): 972~974
邓培红,张军,黎拒难. 铜(Ⅱ)-茜素红S络合物在碳糊电极上吸附伏安法测定铜[J]. 理化检验-化学分册, 2009, 45(8): 972~974
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参考文献
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【3】ZHAO Jing-zhong,SUN De-zhi,JIN Wen-rui.Adsorption voltammetry of copper-[(4-diethyl-amino-2-hydroxyphenyl)azo]-5-hydroxynaphthalene-2,7-disulfonic acid(Beryllon Ⅲ)[J].Anal Chim Acta,1992,268(2):293-299.
【4】张正奇,骆国均,曹祖祥.用8-羟基喹啉吸附伏安法同时测定镍、铜、铅、镉[J].理化检验-化学分册,1993,29(1):25-27.
【5】NIL E F,MOREIRA J C,FOGG A G.Adsorptive stripping voltammetric behaviour of copper(Ⅱ) at a hanging mercury drop electrode in the presence of excess of imidazole[J].Analyst,1991,116(4):369-372.
【6】何平,谢永平.铜-1-(2-吡啶偶氮)-2-萘酚络合物吸附波的研究[J].岩矿测试,1999,18(3):229-231.
【7】王瑞侠,汪新,陈平,等.铜(Ⅱ)-6-苄基氨基嘌呤络合物吸附波的研究及应用[J].分析化学,2006,34(1):111-114.
【8】GAO Zhi-qiang,IVASKA A,LI Pin.Determination of trace amounts of copper with a chemically modified carbon paste electrode[J].Analytical Sciences,1992,8:337-343.
【9】兰雁华,陆光汉.甲壳素修饰碳糊电极测定痕量铜[J].分析化学,1998,26(10):1192-1195.
【10】李陟,齐菊锐,黄振,等.茜素红S修饰活性炭碳糊电极对铜离子的测定[J].吉林大学学报:理学版,2005,43(2):209-213.
【11】谢红旗,李益恒,胡朝晖.茜素修饰碳糊电极吸附伏安法测定痕量铜[J].分析试验室,2001,20(1):39-41.
【12】王敔清,赵凯元.碳糊微电极溶出伏安法测定铝合金中微量铜[J].冶金分析,2005,25(3):5-8.
【13】王宪章.铜-茜素红络合物吸附波的研究[J].矿冶工程,1985,5(2):45-49.
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