Urban water supply parameter detection

5.1.1 Scope This standard specifies the determination of dichloromethane, 1,1-dichloroethane, and 1.2-dichloroethane in drinking water and its source water using headspace gas chromatography. The wood method is applicable to the determination of dichloromethane, 1.1-dichloroethane, and 1,2-dichloroethane in drinking water and its source water. The lowest detection quality and concentration of this method are: 9 ug/1 for dichloromethane, 8 ug/1 for 1,1-dichloroethane, and 13 ug/i for 1.2-dichloroethane, Under the operating conditions of this method, other halogen burning methods do not interfere. 5.1.2 Principle: In a sealed headspace bottle, volatile halogenated molecules escape from the liquid phase into the gas above the liquid surface. At a certain temperature, the halogenated molecules reach dynamic equilibrium between the gas and liquid phases. At this time, the concentration of halogenated molecules in the gas phase is proportional to its concentration in the liquid phase. By measuring the concentration of halogenated molecules in the gas phase, the mass concentration of halogenated light in the water sample can be calculated

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