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Application of a Gas Chromatography/Mass Spectrometric Method for the Determination of Butyltin Compounds in Sediment

  • Won, Yong-Il (Department of Chemistry, KyungNam University) ;
  • Jung, Pyong-Gil (Department of Chemistry, KyungNam University) ;
  • Chung, Min-Young (Organic Analysis Group, Division of Chemical Metrology and Materials Evaluation, Korea Research Institute of Standards and Science) ;
  • Kim, Byung-Joo (Organic Analysis Group, Division of Chemical Metrology and Materials Evaluation, Korea Research Institute of Standards and Science) ;
  • Yim, Yong-Heon (Organic Analysis Group, Division of Chemical Metrology and Materials Evaluation, Korea Research Institute of Standards and Science) ;
  • So, Hun-Young (Organic Analysis Group, Division of Chemical Metrology and Materials Evaluation, Korea Research Institute of Standards and Science) ;
  • Kim, Yong-Seong (Department of Chemistry, KyungNam University)
  • Published : 2004.10.20

Abstract

A gas chromatography/mass spectrometric (GC/MS) method has been developed for the determination of trace mono-n-butyltin (MBT), di-n-butyltin (DBT), and tri-n-butyltin (TBT) compounds in sediments. Samples were extracted by 10% acetic acid in methanol containing 0.03% tropolone and were then derivatized for GC/MS analysis. Ethylation by sodium tetraethylborate and phenylation by sodium tetraphenylborate were evaluated as a derivatization reaction of the organotins in sample extract. n-Hexane was added into reaction media in the beginning of the reaction for the continuous extraction of derivatized organotins. Ethylation requires less than 2 hours to get proper derivatization yields for MBT, DBT, and TBT altogether and produces relatively low amounts of side reaction products. Compared to ethylation, phenylation requires much longer time but provides relatively lower yield and produces considerable amounts of side reaction products. Therefore, the ethylation reaction was applied for the analysis of organotin compounds in sediment. An isotope dilution mass spectrometric (IDMS) method based on GC/MS has been applied to the accurate determination of DBT compounds in the sediments. The IDMS results from the analyses of sediment samples showed a reasonable repeatability and a good agreement with the values obtained by IDMS based on liquid chromatography/induced coupled plasma/mass spectrometry.

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