水素化物パージアンドトラップ : 誘導結合プラズマ質量分析法による海水中有機スズ化合物のスペシエーション(<特集>質量分析法の応用技術)

概要

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In order to monitor ultra-trace amount of organotin compounds in seawater, a high sensitivity speciation method has been investigated using ICP-MS. Organotin compounds are volatilized from seawater by hydride generation, trapped on chromatographic packing material [Chromosorb GAW DMCS (SP-2100 3%, 60〜80 mesh)], then separated on the basis of different boiling points, and introduced into the ICP-MS. The species under investigation are triphenyltin (TPT), diphenyltin (DPT), monophenyltin (MPT), tributyltin (TBT), dibutyltin (DPT), monobutyltin (MBT) and inorganic tin. The ICP-MS is so highly sensitive that a little loss and/or contamination can produce large errors in speciation. The technical improvements are as follows : 1) a nebulizer was directly connected to a torch ; 2) the top point of the nebulizer was cut ; 3) the length of a teflon tube was shortened from 70cm to 30cm ; 4) its inner diameter was changed from φ 1mm to φ 5mm ; 5) the teflon tube was heated at ca. 120℃ ; 6) the quartz glass tube column for a trap was treated with dimethyl chlorosilan, 7) a water trap was removed ; 8) sodium tetrahydroborate was refined by electrolysis. Consequently a satisfactory chromatogram of seven tin species can obtained. The limits of detection (3σ, ng 1^<-1>) are Sn (IV) 0.02,MBT 0.03,MPT 0.04,DBT 0.33,TBT 0.87,DPT 1.33,TPT 10.78.
社団法人日本分析化学会の論文
1996-06-05