BS EN ISO 23161:2018,Soil quality – Determination of selected organotin compounds – Gas-chromatographic method.
BS EN ISO 23161:2018 specifies a gas-chromatographic method for the identification and quantification of organotin compounds (OTCs) in soils as specified in Table l.
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.
2 Normative references
ISO 3696, Water for analytical laboratory use-Specification and test methods;
ISO 11465, Soil quality – Determination of dry matter and water content on a mass basis Gravimetric method;
ISO 16720, Soil quality – Pretreatment of samples by freeze-drying for subsequent analysis;
ISO 22892, Soil quality – Guidelines for the identification of target compounds by gas chromatography and mass spectrometry.
4 Principle
For the ionic and the non-ionic organotin compounds (see Table 1),a different sample pretreatment and sample preparation are necessary. For the determination of organotin cations, laboratory samples are pretreated by freeze drying and grinding. This procedure enables to achieve homogeneity of the sample. The determination of non-ionic TTBT cannot be carried out with freeze-dried materials due to evaporation losses; thus, it shall be determined in the field-moist sample Organotin cations can only be determined after derivatization, whereas TTBT is already peralkylated and can be determined without derivatization (see the flowchart in Figure 1).

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