论文部分内容阅读
采用记录工时定点采样和个体连续采样法在某锅炉房测定煤尘的TWA浓度 ,同时测定其环境瞬时浓度 ;在实验室研究空气湿度对滤膜重量影响等粉尘测定的几个技术问题。现场调查结果表明 ,两种采样方法测得的TWA浓度之间无显著性差异。TWA浓度与我国传统采样法测得的环境瞬时浓度呈一定的函数关系 (y =0 32 6x +0 45 8)。实验室研究显示 ,空气湿度对滤膜重量的影响可忽略不计 ,美国采样头与国产的在采集效率上相近 ,国产滤膜采集效率达 97 9%。结果提示 :我国现行粉尘卫生标准的环境瞬时浓度似可经回归方程公式转换为TWA浓度。现有仪器和实验条件基本可满足TWA浓度测定的技术要求
In this paper, the TWA concentration of coal dust was measured in a boiler room by using fixed-point sampling of time and individual continuous sampling method. Meanwhile, the instantaneous concentration of coal dust was measured. Several technical problems such as the influence of air humidity on the weight of filter membrane were studied in laboratory. Field survey results showed no significant differences between the TWA concentrations measured by the two sampling methods. The concentration of TWA has a certain relationship with the instantaneous concentration of environment as measured by our traditional sampling method (y = 0 32 6x +0 45 8). Laboratory studies have shown that the impact of air humidity on the weight of the filter negligible, the sampling head of the United States and domestic acquisition efficiency is similar to the domestic membrane filtration efficiency of 97 9%. The results suggest that the instantaneous concentration of environmental dust in our country may be converted to TWA concentration by regression equation. The existing instruments and experimental conditions can basically meet the technical requirements of TWA concentration determination