Determination of chlorine ions in raw milk by pulsed amperometric detection in a flow injection system

Journal of Dairy Science
Xingguang ChenGanhui Huang

Abstract

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.

References

Dec 24, 2014·ISA Transactions·Siuli DasBhaswati Goswami
Dec 1, 2015·Food Chemistry·Adrian A Chetty, Surendra Prasad

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