title: Stir bar sorptive extraction with in situ derivatization and thermal desorption-gas chromatography-mass spectrometry for trace analysis of methylmercury and mercury(II) in water sample.
abstract: A method for the trace analysis of methylmercury (MeHg) and Hg(II) in water sample was developed, which involved stir bar sorptive extraction (SBSE) with in situ alkylation with sodium tetraethylborate and thermal desorption (TD)-gas chromatography-mass spectrometry (GC-MS). The limits of quantification of MeHg and Hg(II) are 20 and 10 ng L(-1) (Hg), respectively. The method shows good linearity and the correlation coefficients are higher than 0.999. The average recoveries of MeHg and Hg(II) in tap or river water sample are 102.1-104.3% (R.S.D.: 7.0-8.9%) and 105.3-106.2% (R.S.D.: 7.4-8.5%), respectively. This simple, accurate, sensitive, and selective analytical method may be used in the determination of trace amounts of MeHg and Hg(II) in tap and river water samples.
authors.affiliation: Department of Analytical Chemistry, Faculty of Pharmaceutical Sciences, Hoshi University, Ebara, Tokyo, Japan.
authors.forename: Rie
authors.initials: R
authors.lastname: Ito
authors.forename: Migaku
authors.initials: M
authors.lastname: Kawaguchi
authors.forename: Norihiro
authors.initials: N
authors.lastname: Sakui
authors.forename: Noriya
authors.initials: N
authors.lastname: Okanouchi
authors.forename: Koichi
authors.initials: K
authors.lastname: Saito
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Seto
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Nakazawa
mesh_terms: D000327:Adsorption; D001881:Borates / Q000032:analysis; D002138:Calibration; D002849:Chromatography, Gas / Q000379:methods*; D004867:Equipment Design; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D006358:Hot Temperature; D013058:Mass Spectrometry / Q000379:methods*; D008628:Mercury / Q000032:analysis*; D008767:Methylmercury Compounds / Q000032:analysis; D015203:Reproducibility of Results; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods*; D014881:Water Supply
chemical_list: D001881:Borates; D008767:Methylmercury Compounds; D014874:Water Pollutants, Chemical; C080440:sodium tetraethylborate; D008628:Mercury