摘要
根据文献[4]采用银粉、丁二酮肟与汞混合制成的汞合金糊涂布在固体石蜡碳糊电极表面,制作修饰汞合金电极,并应用于线性扫描伏安法测定痕量钴。在pH6.0的氯化铵一柠檬酸铵缓冲溶液中,钴(Ⅱ)一丁二酮肟配合物于-1.18V出现灵敏度的还原峰,钴(Ⅱ)的质量浓度在0.10~2.0mg·L^-1范围内与峰高呈线性关系,方法的检出限(3s/k)为0.02mg·L^-1对0.10mg·L^-1钴(Ⅱ)溶液进行11次平行测定,相对标准偏差(n=11)为1.93%。该法已用于2件水样中钴含量的测定,平均回收率分别为98.8%及105.1%。
The carbon paste electrode was prepared according to the method described in literature[4], and modified by applying a layer of a paste mixture containing silver powder, dimethylglyoxime and mercury. In the base solution of ammonium citrate and ammonium chloride at pH 6. 0, a coordination complex was formed between the dimethylglyoxime of the modified electrode and Co^2+ ion, showing a sensitive reduction peak at the potential of -1. 18 V (vs. SCE), Values of peak height were found to keep linear relationship with mass concentration of Co^2+ ion in the range of 0. 10-2. 0 mg·L^-1 , with a detection limit (3s/k) of 0. 02 mg·L^-1. Based on these facts, a linear seanning-voltammetric method for determination of traces of cobalt ion in water sample was propose& Precision was tested with 0. 10mg·L^-1 Co^2+ for 11 determination with a same electrode, value of RSD found was 1.93%. Two water samples were analyzed by this method, and using these samples as matrixes, recovery was tested by standard addition method, giving values of average recovery of 98. 8% and 105. 1%.
出处
《理化检验(化学分册)》
CAS
CSCD
北大核心
2010年第7期800-802,806,共4页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
基金
广西自然科学基金(桂科自0728214)
广西教育厅科研基金(桂教科200508135)项目资助
关键词
固体汞合金电极
丁二酮肟
伏安法
钴(Ⅱ)
Silver-amalgam solid electrode
Dimethylglyoxime
Voltammetry
Cobalt ion