海水中の一置換体及び二置換体有機スズ化合物の固相抽出

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タイトル別名
  • Solid-phase extraction of mono-and di-substituted organotin compounds in seawater.
  • カイスイチュウ ノ 1 チカンタイ オヨビ 2 チカンタイ ユウキ スズ カゴウブツ ノ コソウ チュウシュツ

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The solid-phase extraction (SPE) of organotin compounds, such as monobutyltin (MBT), monophenyltin (MPT), dibutyl tin (DBT) and diphenyl tin (DPT) in seawater has been developed. An ion exchange-type solid-phase sorbent (Excelpak SPE-ION/C224, Yokogawa Analytical Systems Inc., Japan) having a hydrophilic and strong acidic sulfo propyl group and a cation-exchange resin (CK08P, Mitsubishi Chemicals, Japan) were comparatively investigated. The recovery of organotin compounds was measured by atomic-absorption spectrometry, and hydride purge & trap/ICP-MS in the case of ultra trace organotin compounds. The variables affecting SPE were investigated by using a 2.5% sodium chloride solution instead of seawater, such as the amounts of sorbent, the conditioning of cation exchange resins, the flow rate and pH of sample solutions, the effect of the amounts of sodium ion, removing of adsorbed sodium, and an eluting agent. After all, the cation exchange resin was chosen to be a SPE sorbent, because it has a higher ion-exchange capacity and exhibits better recoveries of organotin compounds. Ten to twelve ml of a strong acidic cation exchange resin (pH 1.0) of sample solutions and a flow rate of 5 6 ml min-1 gave good results. For removing adsorbed sodium ions from the resins, 100 ml of 0.5 M hydrochloric acid was rinsed after injecting every 125 ml of a sample solution of 2.5% sodium chloride solution containing organotin compounds. The eluent was 14 ml of 0.5 M hydrochloric acid-methanol solution. DBT and DPT were completely recovered from the solution up to 500 ml of artificial seawater, also MBT and MPT were also recovered up to 250 ml. Ultra traces of MBT, MPT, DBT and DPT were determined perfectly by using the present SPE system followed by the hydride purge & trap/ICP-MS.

収録刊行物

  • 分析化学

    分析化学 48 (2), 245-252, 1999

    公益社団法人 日本分析化学会

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