BS EN ISO 23161:2018

This standard BS EN ISO 23161:2018 Soil quality. Determination of selected organotin compounds. Gas-chromatographic method is classified in these ICS categories:

• 13.080.10 Chemical characteristics of soils

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 µg/kg.

Table 1

Organotin compounds

RnSn(4−n)+	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

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.

^a Organotin compounds are measured after derivatization.