The usage of vinyl chloride and trichloroethylene in China has been increasing year by year, and they have been detected in both drinking water and environmental water, making them important environmental pollutants. Based on the latest research results on the health effects of vinyl chloride and trichloroethylene, the newly issued, "Standards for Drinking Water Quality (GB5749-2022)" in China has adjusted the standard limit of vinyl chloride from 0.005 mg/L to 0.001 mg/L and the standard limit of trichloroethylene from 0.07 mg/L to 0.02 mg/L. This article analyzed and discussed the relevant technical contents for determining the above standard limits, including the levels and exposure conditions of vinyl chloride and trichloroethylene in the water environment, health effects, derivation of safety reference values, and determination of hygiene standard limits. Suggestions were also made for the implementation of this standard.
氯乙烯和三氯乙烯在我国使用量逐年上升，饮用水和环境水体中均有检出，是重要的环境污染物。基于氯乙烯和三氯乙烯在健康效应方面最新研究成果，我国新颁布的《生活饮用水卫生标准（GB 5749-2022）》将氯乙烯标准限值由原来的0.005 mg/L调整为0.001 mg/L，三氯乙烯标准限值由原来的0.07 mg/L调整为0.02 mg/L。本文对确定上述标准限值的相关技术内容进行了分析和讨论，包括氯乙烯和三氯乙烯在水环境中存在水平和暴露状况、健康效应、安全基准值的推导和卫生标准限值的确定等，并对标准实施后限值要求的落实情况提出建议。.