This International Standard specifies a method for the identification and quantification of organotin compounds and/ or cations as mentioned in Table 1 in drinking water, surface water and wastewater containing not more than 2 g/l of suspended material. The working range is 10 ng/l to 1 000 ng/l. The respective anions are not determined. This method can also be applicable to other compounds such as R = methyl, n = 1 to 2 and R = phenyl, n = 1 to 2. This International Standard is also applicable to marine water