天津市和平区苯作业场所空气中苯浓度调查

目的：了解苯作业场所空气中苯浓度，推测苯作业发展趋势，方法：采用和平区1993－1999年39家工业企业，220个苯作业点，660个空气样品中的苯浓度值，按不同作业工种分为油漆组，化工（原料）组，粘胶组及印刷组，通过成组设计的多个样本比较的秩和检验进行分析。结果：1997年内不同作业组空气中苯平均浓度差异有显著性（H＝8．00000 P＜0．05），印刷组苯平均浓度高于其它作业组，其余年度中差异无显著性（P＞0．05），1993－1999年，印刷组苯作业场所的苯平均浓度差异无显著性（P＞0．05），结论：和平区苯作业开始由较低浓度过渡到较高浓度，以油漆业为主过渡到以印刷业为主，并且，1997年印刷组苯平均浓度超过国家卫生标准，应引起重视。

Survey of the benzene concentration in benzene work environment in Heping District,Tianjin

Objective:To understand the benzene distribution in work places,calculate the developing result of benzene work. Mathods:To analyze the dates that come from survey in 39 factorys,660 concentration dates by Krudkal-Wallis test.These dates are divided into four different groups: paint group,industrial chemical group,binder group and printing group. Reuslts:There is remarkable difference of the benzene concentration dates(H=8.0000 P<0.05) in 1997 and the benzene concentration dates in the printing group are higher than other groups.In other years,there are no remarkable differences(P>0.05). Conclusion:The benzene work in Heping Distract began to transfer from low concentration to high concentration,from paint industry to printing industry. One of the average benzene concentration dates in 1997 exceeds the nation hygience standard.So we should pay much attention on it.