Electrochemical behavior of dibutyltin(IV) compounds and their determination at ppb levels by differential pulse anodic stripping voltammetry.

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概要

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• The electrochemical behavior of dibutyltin(IV) compounds (Bu<SUB>2</SUB>SnX<SUB>2</SUB>) (X=chloride, laurate (L), and 6-methylheptyl maleate (MHM)) in 50% (v/v) and 80% (v/v) ethanol–water media (apparent pH 7.3) containing 0.002% Triton X-100 has been investigated by polarography and cyclic voltammetry. It has been found that Bu<SUB>2</SUB>SnX<SUB>2</SUB> gives a two-electron transfer step at about −0.8 V <I>vs.</I> SCE, which consists of very close two one-electron steps, and a two-electron step at about −1.4 V in both media. Over the potential range of either side of the first reduction wave, both Bu<SUB>2</SUB>SnX<SUB>2</SUB> and their reduction products are significantly adsorbed on the surface of a mercury electrode in 50% (v/v) ethanol, but not in 80% (v/v) ethanol. The adsorbed reduction products are readily re-oxidized at the mercury electrode in 50% ethanol. The re-oxidation peak was successfully utilized for the determination of traces of Bu<SUB>2</SUB>SnCl<SUB>2</SUB> by means of the differential pulse anodic stripping voltammetry (DPASV) over the concentration range of 3–50 ppb (μg dm<SUP>−3</SUP>) at the deposition time of 60 s. The DPASV behavior of Bu<SUB>2</SUB>SnX<SUB>2</SUB> (X=chloride, L, MHM, and 1-dodecanethiolate) has been investigated in a 50% ethanol medium in detail. Further, a procedure has been developed for determining Bu<SUB>2</SUB>SnX<SUB>2</SUB> in natural water down to ppb levels.

• 公益社団法人 日本化学会の論文

著者

• Nakamoto Masao

  Environmental Pollution Control Center Of Osaka Prefecture

• Kitamura Hideki

  Environmental Pollution Control Center, Osaka Prefectural Government

• Nakamoto Masao

  Environmental Pollution Control Center, Osaka Prefectural Government

• Sugimae Akiyoshi

  Environmental Pollution Control Center, Osaka Prefectural Government

関連論文

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• The correlation between the electron-capture detector response and the chemical structure for polychlorinated biphenyls.
• Electrochemical behavior of dibutyltin(IV) compounds and their determination at ppb levels by differential pulse anodic stripping voltammetry.

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