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Chemosphere. 2010 Oct;81(6):732-7. doi: 10.1016/j.chemosphere.2010.07.031. Epub 2010 Aug 6.

Perchlorate in dairy milk and milk-based powdered infant formula in South Korea.

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1
Department of Chemistry and Environmental Sciences, Korea Army Academy at Young-Cheon, Young-Cheon, Gyeongbuk 770-849, South Korea.

Abstract

Perchlorate has been detected in dairy milk and milk-based powdered infant formula samples from many different provinces of South Korea. A total of 37 dairy milk samples from 12 different brands and 26 milk-based powdered infant formula samples from four different brands were tested for the presence of perchlorate. These brands and their products, which are analyzed in this study, cover over 95% of the dairy milk and milk-based powdered infant formula market share in South Korea, which has a population of approximately 50 million inhabitants. Perchlorate was explicitly detected by ion chromatography tandem mass spectrometry; the limit of quantification (LOQ) for dairy milk and milk-based powdered infant formula was 0.12 μg L(-1) and 1.0 μg kg(-1), respectively. The perchlorate concentration in all the samples was above the LOQ. The perchlorate detection data is given as follows: 1.99-6.41 μg L(-1) (n = 37, mean concentration = 4.59 ± 0.17 μg L(-1)) for dairy milk and 1.49-33.3 μg kg(-1) (n = 26, mean concentration = 7.83 ± 0.22 μg kg(-1)) for milk-based infant formula. This study provides increasing evidence that perchlorate commonly occurs in dairy products, presumably as the result of perchlorate intake by dairy cattle from water and feed.

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