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By Jacques Oosthuizen

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Other analytical procedures perform the clean-up before derivatization. Since underivatized OTs have a strong interaction in these adsorbents; polar eluents are needed to achieve quantitative recovery, which leads to poor clean-up efficiency. Tropolone in hexane has been used as an eluent in this case. , 1998) and sodium tetrahydroborate (NaBH4) as a derivatization reagent (Balls, 1987). Hydride generation is more prone to interference and in the case of mono substituted organotin; it leads to very volatile derivatives, which can hardly be further pre-concentrated by evaporation of the extracting solvent.

Also, that dibutyltins (DBTs) and monobutyltins (MBTs) were mostly used as stabilizers in polyvinyl chlorides and as catalysts in the production of polyurethane foams, silicones, and in other industrial processes (Cai and Bayona, 1995; Fent, 1996). , 199) is their use in the manufacture of fungicides, acaricides and insecticides for use in agriculture. , 2000), especially in developed countries. , 1993) and human health (Fatoki, 2000), an international stakeholders’ process (Murmansk-2000) considered a draft treaty to ban the use of TBTs on all hulls worldwide.

As mentioned above, organotin compounds are not involved in biogeochemical process. They rather bind onto the surface of the sediment, hence, the complete dissolution of the later prior to the analysis is, therefore, not considered necessary. , 2000). While the tri- and di-substituted compounds can be extracted quantitatively, only about 60 % or less of the mono-substituted compounds are recovered. g. , 1997). On one hand, recoveries obtained by the first approach are satisfactory for di- and tri-organotin species but a clean-up step is usually needed.

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