Packaging for drinking water/food testing

Water quality - Determination of polychlorinated biphenyls - Gas chromatography-mass spectrometry warning: Polychlorinated biphenyls are toxic, have carcinogenic, teratogenic, and mutagenic effects. Avoid ingestion and contact with skin. The organic solvents used in the analysis process, such as n-hexane, are toxic to the human body. Analysts should wear gloves and a gas mask with an activated carbon layer, and operate in a fume hood to minimize respiratory and skin contact. This standard specifies the gas chromatography-mass spectrometry method for the determination of 18 types of polychlorinated biphenyls in water. This standard is applicable to the determination of 18 types of polychlorinated biphenyls in surface water, groundwater, industrial wastewater, and domestic sewage. When the sampling volume is 1L, the detection limit of this method is 1.4-2.2 ng/L, and the lower limit of determination is 5.6-8.8 ng/L. Please refer to Appendix A. 2 Normative References This standard refers to the following documents or their clauses. For undated references, their valid versions are applicable to this standard. H/T 91 Technical Specification for Surface Water and Wastewater Monitoring HJT164 Technical Specification for Groundwater Environment Monitoring 3 Method principle: The liquid liquid extraction method or solid phase extraction method is used to extract polychlorinated biphenyls in the sample. The extraction liquid is dehydrated, concentrated, purified, and fixed volume, and then separated and determined by gas chromatography-mass spectrometry. Qualitative analysis is based on retention time, fragment ion mass to charge ratio, and different ion abundance ratios, while quantitative analysis is performed using internal standard method

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