DIN EN ISO 23161:2011-10

This International Standard specifies a method for the identification and quantification of organotin compounds in soils. The method 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 µg/kg. When applying this method to the determination of other organotin compounds not specified in the scope, its suitability should be proven by proper in-house validation experiments, for example, methyltin compounds. Organotin cations can only be determined in accordance with this International Standard after derivatisation. 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 derivatisation. The properties, such as particle size distribution, water content and organic matter content of the solids to be analysed using this International Standard vary widely. Sample pretreatment is designed adequately with respect to both the properties of the organotin compounds and the matrix to be analysed. This standard provides extensive information about the pre-treatment and contains informative material for the validation procedures carried out.