This document specifies a gas-chromatographic method for the identification and quantification of organotin compounds (OTCs) in soils as specified in Table 1. This document is also applicable to samples from sediments, sludges and wastes (soil-like materials). The working range depends on the detection technique used and the amount of sample taken for analysis. The limit of quantification for each compound is about 10 ¼g/kg. Table 1 Organotin compounds, which can be determined in accordance with this document R5Ø[ÜSn(4"5Ø[Ü)+ R n Name Acronym Organotin cationsa BuSn3+ Butyl 1 Monobutyltin cation MBT Bu2Sn2+ Butyl 2 Dibutyltin cation DBT Bu3Sn+ Butyl 3 Tributyltin cation TBT OcSn3+ Octyl 1 Monooctyltin cation MOT Oc2Sn2+ Octyl 2 Dioctyltin cation DOT Ph3Sn+ Phenyl 3 Triphenyltin cation TPhT Cy3Sn+ Cyclohexyl 3 Tricyclohexyltin cation TCyT Peralkylated organotin Bu4Sn Butyl 4 Tetrabutyltin TTBT a Organotin compounds are measured after derivatization. Organotin cations can only be determined in accordance with this document after derivatization. The anionic part bound to the organotin cation is mainly dependent on the chemical environment and is not determined using this method. The peralkylated organotin compounds behave in a completely different way from their parent compounds. Tetraalkylated organotin compounds which are already peralkylated, such as tetrabutyltin, are determined directly without derivatization. The properties such as particle size distribution, water content and organic matter content of the solids to be analysed using this document vary widely. Sample pretreatment is designed adequately with respect to both the properties of the organotin compounds and the matrix to be analysed.