[CPEO-MEF] PERCHLORATE: Evaluation in feed and dairy products

[Lenny Siegel <lennysiegel@gmail.com>]

Perchlorate in the Feed-Dairy Continuum of the Southwestern United States

C. A. Sanchez, B. C. Blount, L. Valentin-Blasini, S. M. Lesch, and R. I. 
Krieger
Journal of Agricultural and Food Chemistry
June 13, 2008

Abstract:

Perchlorate has the potential to cause thyroid dysfunction by inhibiting 
iodide uptake by the sodium iodide symporter. Perchlorate-contaminated 
waters may lead to human exposure through drinking water and food chain 
transfer in crops by way of irrigation water. Perchlorate has been found 
in dairy milk collected nationally and internationally. This study was 
conducted to evaluate perchlorate in the feed-dairy continuum in the 
southwestern United States. All feed products collected at dairies in 
this study had detectable levels of perchlorate as analyzed by ion 
chromatography-tandem mass spectrometry. The calculated total 
perchlorate intake across dairies ranged from 1.9 to 12.7 mg/cow per 
day. The variation in total perchlorate intake across dairies was 
largely associated with variation in forage and silage products. Alfalfa 
products were the single most important source of perchlorate intake 
variability among dairies. The estimated perchlorate intake from 
drinking water ranged from 0.01 mg per cow per day and was generally 
less than 2% of the total perchlorate intake. The perchlorate content of 
milk ranged from 0.9 to 10.3 µg/L and was similar to levels reported by 
the Food and Drug Administration’s Total Diet Study. The perchlorate 
content of milk was significantly related to the presence of perchlorate 
in feed but the variation of perchlorate in milk could not be explained 
by feed intake alone.

For the original abstract and a link to a full article download (fee 
required), to go http://pubs.acs.org/journals/jafcau/index.html

--


Lenny Siegel
Executive Director, Center for Public Environmental Oversight
a project of the Pacific Studies Center
278-A Hope St., Mountain View, CA 94041
Voice: 650/961-8918 or 650/969-1545
Fax: 650/961-8918
<lsiegel@cpeo.org>
http://www.cpeo.org



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