人造矿物纤维绝热棉职业接触水平测定及其特征分析

Exposure assessment and analysis for the man-made vitreous fibre insulation wools

目的评估人造矿物纤维绝热棉生产企业不同工种作业人员玻璃棉、岩棉的职业接触水平,分析其接触特征。方法选择生产历史较长、生产连续性较好的2家玻璃棉企业(A和B)、2家岩棉(含矿渣棉)企业(C和D)作为调查对象。纤维计数浓度和总粉尘质量浓度分别按照WHO推荐方法和GBZ/T192.1—2007《工作场所空气中粉尘测定第1部分:总粉尘浓度》进行测定。选择代表性的样品,估算不同工种作业人员的日接触时间加权平均浓度(CTWA,8h)和周接触时间加权平均浓度(CTWA,40h)。结果除D岩棉企业2#线翻板工的纤维计数浓度水平较高(>1f/ml)外,其他各工种所接触的玻璃棉或岩棉的纤维计数浓度水平均较低(<1f/ml);玻璃棉企业打包工、岩棉企业生产线和深加工线操作工的总粉尘质量浓度水平高出国家标准规定的总粉尘容许浓度(3mg/m3)。结论对于人造矿物纤维绝热棉这类粗直径的纤维,纤维计数浓度较低时,总粉尘质量浓度仍可能较高。玻璃棉生产企业总体呈现纤维计数浓度低、总粉尘质量浓度也低的特征,岩棉生产企业则总体呈现纤维计数浓度低、总粉尘质量浓度高的特征。

Objective To assess the occupational exposure levels of the different jobs in the man-- made vitreous fibre insulation wools production plants, and analyze the exposure features. Methods 2 glass wool plants （A and B） and 2 rock wool （include slag wool） plants （C and D） with better production continuity were selected as the study sites. Method recommended by WHO was used to determine the number concentration of fibre, determination of dust in the air of workplace - Part 1.. Total dust concentration （GBZ/T 192.1 -- 2007） was used to determine the gravimetric concentration of total dust. Representative samples were used to estimate the exposure concentration per day （CTwA,8h） and per week （CTwA,40h）for different jobs. Results Ex- cept the board--turner in rock wool plant D, the number concentrations of fibre of other jobs from the study