This International Standard specifies a guide for the selective quantitative analysis by immunoassays of environmental chemicals such as pesticides (including insecticides) or their metabolites in drinking, ground and surface water. The application range of the procedure for the analysis of pesticides in drinking water applies to mass concentrations ≥ 0,05 μg/l. Therefore, the determination limit should be in this case ≤ 0,05 μg/l.