检出限
电位滴定法
化学
氯
安培法
氯化物
离子
分析化学(期刊)
电极
色谱法
电化学
物理化学
有机化学
作者
Xingguang Chen,Chu Bei-bei,Huiting Xi,Junjun Xu,Lai Li-zhi,Huifeng Peng,Dewei Deng,Ganhui Huang
标识
DOI:10.3168/jds.2018-14395
摘要
Chloride ion concentration in milk was determined by pulsed amperometric detection in a flow injection system. Results showed that the Au electrode lost 3 electrons at 1.10 V and formed chloroaurate ions (AuCl4−) by combining with chloride ions, after which AuCl4− was partly reduced to Au at 0.6 V. Based on the electrochemical process, a triple waveform with detection potential of 1.15 V, detection time of 150 ms, oxidation potential of 1.4 V, oxidation time of 550 ms, reduction potential of 0 V, and reduction time of 400 ms was applied to the Au electrode for detecting chloride ion concentration in milk. The approach is rapid and automatic and features a detection limit of 0.005 g/L. The relative standard deviation obtained by 60 repetitive injections reached 1.48% at 2 g/L of NaCl. The method developed using the Au electrode without modification was used to analyze the chloride ion concentration in raw milk without preprocessing. The method showed good agreement with potentiometric titration.
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