Perchlorate in milk.
Perchlorate was unambiguously detected by ion chromatography-suppressed conductivity (IC-CD) and/or ion chromatography-electrospray mass spectrometry (IC-MS) in seven of seven supermarket milk samples bought randomly in Lubbock, TX. Quantitation by IC-MS and IC-suppressed conductivity detection in conjunction with a preconcentration-preelution method provided comparable results. With a sample cleanup procedure that involved protein removal by ethanol and sequential passage though activated alumina and C-18 silica, the limit of detection for perchlorate in milk was 0.5 microg/L. The levels found ranged from 1.7 to 6.4 microg/L. An evaporated milk sample contained perchlorate at 1.1 +/- 0.6 microg/L level, while we did not find detectable levels in a reconstituted powdered milk sample.
Kirk
Andrea B
AB
The Institute of Environmental and Human Health, MS 1163, USA.
Smith
Ernest E
EE
Tian
Kang
K
Anderson
Todd A
TA
Dasgupta
Purnendu K
PK
D000818:Animals; D002417:Cattle; D002852:Chromatography, Ion Exchange; D004784:Environmental Monitoring; D004785:Environmental Pollutants / Q000032:analysis*; D008892:Milk / Q000737:chemistry*; D010472:Perchlorates / Q000032:analysis*; D012016:Reference Values; D017670:Sodium Compounds / Q000032:analysis*; D021241:Spectrometry, Mass, Electrospray Ionization; D013781:Texas
D004785:Environmental Pollutants; D010472:Perchlorates; D017670:Sodium Compounds; C031068:sodium perchlorate