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1989年4-10月,我们按照统一调查方案,对密县67家乡镇煤矿进行了现场劳动卫生学调查,对1626名接尘工人作了健康检查。结果:85个粉尘样品中,粉尘浓度超过国家卫生标准的52个,样品超标率61.18%,浓度范围2.16～626.75mg/m~3,最高浓度超标62.68倍;粉尘分散度小于5微来的粒子占78.02%;游离SiO_2含量
From April to October 1989, in accordance with the unified investigation plan, we conducted on-site labor hygiene surveys on 67 villages and towns coal mines in Minxian County and conducted health checks on 1,626 dust-pick-up workers. Results: Among 85 dust samples, the dust concentration exceeded the national health standards by 52, the sample exceeded the standard rate of 61.18%, the concentration range of 2.16 ~ 626.75mg / m ~ 3, the highest concentration of 62.68 times exceeded; dust dispersion less than 5 micro particles Accounting for 78.02%; free SiO_2 content