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目的 为修订《生产性粉尘作业危害程度分级》(GB5817 86)标准提供依据。方法 采用相关和回归方法 ,分析回顾性调查资料和用呼吸同步采样法测尘获得的现场调查资料 ,探讨以呼吸接触总粉尘浓度 (mg/m3)、接尘时间肺总通气量 (m3·d- 1·人- 1)和粉尘中游离SiO2 含量 (% )三者乘积值为呼吸接触游离SiO2 剂量 (mg·d- 1·人- 1) ,作为粉尘作业危害程度分级剂量标准值。结果 利用接触游离SiO2 剂量并结合矽肺的剂量 -效应关系 ,可将粉尘作业危害程度划分为 5级 :0、Ⅰ、Ⅱ、Ⅲ、Ⅳ级 (接触游离SiO2 剂量分别为 0～ 8.0、8.1～ 12 .0、12 .1～ 16.0、16.1～ 2 4.0、>2 4.0mg·d- 1·人 - 1。结论 接触游离SiO2 剂量与矽肺发病关系密切 ,用接触游离SiO2 剂量作为粉尘危害程度分级指标可靠且简捷易行
Objective To provide a basis for revising the “Classification of Hazards of Productive Dust” (GB5817 86). Methods The correlation analysis and regression method were used to analyze retrospective survey data and field survey data obtained by breath synchronous sampling method to investigate the relationship between total dust concentration (mg / m3) and total lung ventilation (m3 · d - 1 · human - 1) and the free SiO2 content (%) in the dust is the respiratory exposure free SiO2 dose (mg · d-1 · human-1), which is used as the grading standard value of dust hazard. Results According to dose-effect relationship of exposure to free SiO2 and combined with silicosis, the hazard degree of dust operation can be divided into 5 grades: 0, Ⅰ, Ⅱ, Ⅲ and Ⅳ (contact free SiO2 dose is 0 ~ 8.0, 8.1 ~ 12 .0,12 .1 ~ 16.0,16.1 ~ 2 4.0,> 2.0 mg · d-1 · human-1.Conclusion The exposure to free SiO2 dose is closely related to the pathogenesis of silicosis. Using the contact free SiO2 dose as a grading index of the degree of dust hazard is reliable And simple and easy