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A variety of sample presentation and atomisation methods have been examined to obtain sufficient sensitivity for the trace determination of tin tetraalkyls and alkyltin chlorides (R,,SnCl,,; R = methyl or ethyl; n = 1-4)after their separation by gasliquid or by high-performance liquidliquid chromatography. Detection limits range from 10-20 pg (flame atomisation) to 1 pg (direct pyrolysis) and 2-20 pg (hydride reduction followed by direct pyrolysis). The construction of systems including an automated hydride generator is described. Keywords : Gasliquid and high-performance liquidliquid chromatography ; tin tetraalkyls and alkyltin chlorides ; pyrolysis ; hydride generation ; tube furnace

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