Determination of trace level perchlorate in drinking water and ground water by ion chromatography.
Ammonium perchlorate, a key ingredient in solid rocket propellants, has recently been found in ground and surface waters in the USA in a number of states, including California, Nevada, Utah, and West Virginia. Perchlorate poses a health risk and preliminary data from the US Environmental Protection Agency reports that exposure to less than 4-18 micrograms/l provides adequate human health protection. An ion chromatographic method was developed for the determination of low microgram/l levels of perchlorate in drinking and ground waters based on a Dionex IonPac AS11 column, a 100 mM hydroxide eluent, large loop (1000 microliters) injection, and suppressed conductivity detection. The method is free of interferences from common anions, linear in the range of 2.5-100 micrograms/l, and quantitative recoveries were obtained for low microgram/l levels of perchlorate in spiked drinking and ground water samples. The method detection limit of 0.3 microgram/l permits quantification of perchlorate below the levels which ensure adequate health protection. A new polarizable anion analysis column, the IonPac AS16, and its potential applicability for this analysis is also discussed.
Jackson
P E
PE
Dionex Corporation, Sunnyvale, CA 94088-3606, USA.
Laikhtman
M
M
Rohrer
J S
JS
D000838:Anions / Q000032:analysis; D002852:Chromatography, Ion Exchange / Q000379:methods*; D010472:Perchlorates / Q000032:analysis*; D014867:Water / Q000737:chemistry*; D014881:Water Supply
D000838:Anions; D010472:Perchlorates; D014867:Water