title: Rapid and selective determination of free chlorine in aqueous solution using electrophilic addition to styrene by gas chromatography/mass spectrometry.
abstract: We developed a rapid and selective method for determination of free chlorine in aqueous solution by gas chromatography/mass spectrometry for the first time. Free chlorine was converted to styrene chlorohydrin using electrophilic addition to styrene in sodium acetate buffer solution (pH 5). The chlorine derivative obtained was extracted with chloroform, and then analyzed by GC/MS. The calibration curve showed good linearity from 0.2-100 μg/mL (as available chlorine). The detection limit was 0.1 μg/mL, and the intra- and interday accuracy were measured at concentrations of 10, 50, and 75 μg/mL to be -1.3 to 6.9% (intraday) and 3.8-8.0% (interday) as % Bias. The precision was between 1.4 and 4.5% as % RSD. These results indicate that this method is a superior technique for the identification of free chlorine. This method was successfully applied to quantification in commercial samples and in samples of a criminal case.
authors.affiliation: Graduate School of Systems Life Sciences, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.
authors.forename: Kengo
authors.initials: K
authors.lastname: Wakigawa
authors.forename: Akinaga
authors.initials: A
authors.lastname: Gohda
authors.forename: Sunao
authors.initials: S
authors.lastname: Fukushima
authors.forename: Takeshi
authors.initials: T
authors.lastname: Mori
authors.forename: Takuro
authors.initials: T
authors.lastname: Niidome
authors.forename: Yoshiki
authors.initials: Y
authors.lastname: Katayama
mesh_terms: D057886:Bleaching Agents / Q000032:analysis*; D002138:Calibration; D002713:Chlorine / Q000032:analysis*; D002728:Chlorohydrins / Q000737:chemistry*; D004202:Disinfectants / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry; D006801:Humans; D007564:Japan; D057230:Limit of Detection; D020058:Styrene / Q000737:chemistry*; D014867:Water / Q000032:analysis*
chemical_list: D057886:Bleaching Agents; D002728:Chlorohydrins; D004202:Disinfectants; D014867:Water; D020058:Styrene; D002713:Chlorine