Determination of iodine in milk powder by combing microwave digestion with inductively coupled plasma mass spectrometry

Authors

ZHU Jia-jun, Guangzhou Inspection Testing and Certification Group Co., Ltd., Guangzhou, Guangdong 510000 , China ；National Center for Quality Inspection of Processed Food, Guangzhou, Guangdong 510000 , China
LI Liang, Guangzhou Inspection Testing and Certification Group Co., Ltd., Guangzhou, Guangdong 510000 , China ；National Center for Quality Inspection of Processed Food, Guangzhou, Guangdong 510000 , China
HE Shuang, Guangzhou Huaxin Testing Technology Co., Ltd., Guangzhou, Guangdong 510663 , China
CHEN Jing-zhou, Guangzhou Inspection Testing and Certification Group Co., Ltd., Guangzhou, Guangdong 510000 , China ；National Center for Quality Inspection of Processed Food, Guangzhou, Guangdong 510000 , China

Abstract

Objective:This study aimed to establish an efficient and accurate method for the determination of total iodine in milk powder by microwave digestion combining with inductively coupled plasma mass spectrometry (ICP-MS). Methods:Firstly, 0.2 mL of precipitant and 5 mL of ultrapure water were added for mixing and standing, and then 5 mL of nitric acid was added for microwave digestion. After cooling, the volume was fixed to 35 mL with ultrapure water, and then 10 mL of ammonia, 1 mL of stabilizer and 50 μL of TritonX-100 were added in sequence, avoiding the iodine loss. Results:The detection limit was 0.044 mg/kg,while iodine presented favorable linearity in the range of 0~20 μg/L with correlation coefficient (r) of 0.999 9. The precision of the method (RSD %) was less than 5%, and the spiked recoveries of real samples is 90.2% ~ 107.7%. The measured values of various standard substances are consistent with the labeled values. The iodine content of the same milk powder was similar to that of GB 5009.267—2020. Conclusion:The method showed the advantages of high efficiency, good recovery and accurate for the determination of iodine contents in milk powder, ensures personnel safety and reduces instrument maintenance cost.

Publication Date

11-23-2022

First Page

50

Last Page

54

DOI

10.13652/j.spjx.1003.5788.2022.90188

Recommended Citation

Jia-jun, ZHU; Liang, LI; Shuang, HE; and Jing-zhou, CHEN (2022) "Determination of iodine in milk powder by combing microwave digestion with inductively coupled plasma mass spectrometry," Food and Machinery: Vol. 38: Iss. 10, Article 9.
DOI: 10.13652/j.spjx.1003.5788.2022.90188
Available at: https://www.ifoodmm.cn/journal/vol38/iss10/9

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