Tiêu chuẩn quốc tế

• Số hiệu / Standard Number: ISO DIS 23646:2020
• Năm ban hành / Publication date: 2020
• Tình trạng / Status: A - Còn hiệu lực
• Tên tiếng Anh / Title in English: Soil quality — Determination of organochlorine pesticides by gas chromatography with mass selective detection (GC-MS) and gas chromatography with electron-capture detection (GC-ECD)
• Chỉ số phân loại Quốc tế (ICS) / By field: 13.080.10 - Ðặc tính hoá học của đất
• Số trang / Page: 37

Phạm vi áp dụng / Scope of standard

This International Standard specifies a method for quantitative determination of organochlorine pesticides and semi-volatile chlorobenzenes in soil and sediment, using GC-MS and GC-ECD

The limit of detection and the limit of application depends on the determinants, the sample intake, the equipment used, the quality of chemicals used for the extraction of the sample and the clean-up of the extract.

Under the conditions specified in this document, lower limits of application from 1 μg/kg (expressed as dry matter) for soils to 10 μg/kg (expressed as dry matter) for sediments can be achieved. The necessity to achieve these lower limits of application depends on the analyses order and the current limit values.

Soils and sediments may differ in properties as well as in the expected contamination levels of OCP and the presence of interfering substances. These differences make it impossible to describe one general procedure. Based on the properties of the samples, this document contains decision tables regarding drying-, extraction- and clean-up procedures to be used. This method is "performance based". It is permitted to modify the method if all performance criteria given in this method are met.

The method may be applied to the analysis of other chlorinated compounds not specified in the scope, provided suitability is proven by proper in-house validation experiments.