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- W2020479920 abstract "A new IC-ESI-MS/MS method, with simple sample preparation procedure, has been developed for quantification and confirmation of perchlorate (ClO4-) anions in water, fresh and canned food, wine and beer samples at low part-per-trillion (ng l(-1)) levels. To the best of our knowledge, this is the first time an analytical method is used for determination of perchlorate in wine and beer samples. The IC-ESI-MS/MS instrumentation consisted of an ICS-2500 ion chromatography (IC) system coupled to either an API 2000 or an API 3200 mass spectrometer. The IC-ESI-MS/MS system was optimized to monitor two pairs of precursor and fragment ion transitions, i.e., multiple reaction monitoring (MRM). All samples had oxygen-18 isotope labeled perchlorate internal standard (ISTD) added prior to extraction. Chlorine isotope ratio (35Cl/37Cl) was used as a confirmation tool. The transition of 35Cl16O4- (m/z 98.9) into 35Cl16O3- (m/z 82.9) was monitored for quantifying the main analyte; the transition of 37Cl16O4- (m/z 100.9) into 37Cl16O3- (m/z 84.9) was monitored for examining a proper isotopic abundance ratio of 35Cl/37Cl; and the transition of 35Cl18O4- (m/z 107.0) into 35Cl18O3- (m/z 89.0) was monitored for quantifying the internal standard. The minimum detection limit (MDL) for this method in de-ionized water is 5 ng l(-1) (ppt) using the API 2000 mass spectrometer and 0.5 ng l(-1) using the API 3200 mass spectrometer. Over 350 food and beverage samples were analyzed mostly in triplicate. Except for four, all samples were found to contain measurable amounts of perchlorate. The levels found ranged from 5 ng l(-1) to 463.5+/-6.36 microg kg(-1) using MRM 98.9-->82.9 and 100 microl injection." @default.
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- W2020479920 date "2006-05-01" @default.
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- W2020479920 title "Analysis of perchlorate in foods and beverages by ion chromatography coupled with tandem mass spectrometry (IC-ESI-MS/MS)" @default.
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- W2020479920 doi "https://doi.org/10.1016/j.aca.2006.03.012" @default.
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