论文部分内容阅读
目的比较定点采样法估算时间加权平均浓度(TWA)和个体实测8小时时间加权平均浓度(8 h-TWA),探讨有效估算作业工人个体接触水平的方法。方法从2008年12月2~21日连续3周对某聚氯乙烯厂3个氯乙烯相关车间同时进行作业场所定点采样和作业工人的8 h连续个体采样,应用二硫化碳解析-气相色谱法检测空气中氯乙烯浓度。将定点采样结果结合作业工人活动时间间接估算8 h-TWA,并与个体采样实测TWA比较分析。结果作业场所空气中氯乙烯浓度和作业工人8 h-TWA均低于国家职业卫生标准;应用定点采样估算的TWA值是个体采样实测值的1.33~5.19倍;估测值和实测值之间存在一定的线性关系(R=0.661,P<0.01),可以用回归方程Log(8 h-TWA实测值)=0.890×Log(8 h-TWA估测值)-0.453,R2=0.437来估算作业工人实际TWA。结论当8 h-TWA实测值范围在0.17~12.51 mg/m3时,本研究中所得的回归方程可以用于估测该厂3个车间冬季氯乙烯个体接触水平。
OBJECTIVE: To compare the time-weighted average concentration (TWA) of fixed-point sampling method with the 8-hour time-weighted average concentration (8 h-TWA) measured by individual to explore the effective method to estimate the individual exposure level of workers. Methods From March 2, 2008 to December 21, 2008, three PVC-related workshops of a PVC plant were used to carry out fixed-point sampling and continuous 8-h continuous sampling of working workers at the same time. The air was detected by carbon disulfide analysis-gas chromatography Medium vinyl chloride concentration. The results of fixed-point sampling combined with the activity time of workers indirectly estimated 8 h-TWA, and compared with the actual sampling TWA analysis. Results The concentration of vinyl chloride in the air and the 8 h-TWA of working workers were lower than the national occupational health standards. The TWA estimated by fixed-point sampling was 1.33-5.19 times the measured value of individual samples. There was a difference between the estimated value and the measured value (R = 0.661, P <0.01), the regression equation Log (8 h-TWA measured value) = 0.890 × Log (8 h-TWA estimated value) -0.453, and R2 = 0.437 can be used to estimate the number of workers Actual TWA. Conclusion The regression equation obtained in this study can be used to estimate the level of winter vinyl chloride exposure in three plants in this plant when the measured value of 8 h-TWA ranges from 0.17 to 12.51 mg / m3.