title: Determination of atrazine, deethylatrazine and simazine in water at parts-per-trillion levels using solid-phase extraction and gas chromatography/ion trap mass spectrometry.
abstract: Methods for trace analysis of atrazine and simazine in water have been developed by using stable-isotope dilution with detection by gas chromatography/mass spectrometry. D(5)-Atrazine was used as the internal standard for the determination of atrazine and deethylatrazine, while (13)C(3)-simazine was used for simazine analysis. Water samples were fortified with known amounts of the internal standards and submitted to solid-phase extraction with a C(18) bonded-silica cartridge. A gas chromatograph coupled with an ion-trap mass spectrometer was used to analyze the water sample extracts. Method detection limits were 38 parts-per-trillion (ppt) for atrazine and deethylatrazine and 75 ppt for simazine. The accuracy of the method, represented by relative analytical errors, was less than 15%, and the method precision was less than 5% (relative standard deviation, n = 9). The method was successfully applied to analyze surface water samples collected from a reservoir and a river at ppt levels.
authors.affiliation: Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, Kowloon, Hong Kong SAR, China.
authors.forename: W T
authors.initials: WT
authors.lastname: Ma
authors.forename: Zongwei
authors.initials: Z
authors.lastname: Cai
authors.forename: G B
authors.initials: GB
authors.lastname: Jiang
mesh_terms: D001280:Atrazine / Q000031:analogs & derivatives* / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D008832:Microchemistry / Q000379:methods*; D044367:Phase Transition; D012098:Reproduction; D045483:Rivers / Q000737:chemistry; D012680:Sensitivity and Specificity; D012839:Simazine / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification; D014867:Water / Q000032:analysis* / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014881:Water Supply / Q000032:analysis
chemical_list: D014874:Water Pollutants, Chemical; D014867:Water; C446541:deethylatrazine; D001280:Atrazine; D012839:Simazine