第一类污染物是指能在环境或动植物内积蓄,对人类产生长远不良影响的污染物质,主要有总汞、烷基汞、总镉、总铬、六价铬、总砷、总铅、总镍、苯并[ɑ]芘、总铍、总银等。目前,对于第一类污染物的排放控制要求,《污水综合排放标准》(GB 8978—1996)4.2.1.1规定:“第一类污染物,不分行业和污水排放方式,也不分受纳水体的功能类别,一律在车间或车间处理设施排放口采样,其最高允许排放浓度必须达到本标准要求。”“5.1采样点”规定:采样点应按4.2.1.1及4.2.1.2第一、第 Pollutants of the first type refer to pollutants that can accumulate in the environment or animals and plants and have long-term adverse effects on human beings. They are mainly total mercury, alkylmercury, total cadmium, total chromium, hexavalent chromium, total arsenic and total lead , Total nickel, benzo [ɑ] pyrene, total beryllium, total silver and so on. At present, for the first type of pollutant emission control requirements, “Integrated Wastewater Discharge Standard” (GB 8978-1996) 4.2.1.1 states: “The first category of pollutants, regardless of industry and sewage discharge methods, regardless of The functional categories of water bodies, all in the workshop or workshop treatment facilities discharge port sampling, the maximum allowable emission concentration must meet the requirements of this standard. ”“ 5.1 Sampling points ”Regulations: sampling points should 4.2.1.1 and 4.2.1.2 First, the first