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目的通过对苯等化学致癌物慢性暴露致癌风险的定量评价,为我国职业危害因素的控制以及职业肿瘤等严重职业病的预防和管理提供科学依据,进行职业危害防控。方法选取某大型石油化工企业新建50万t/年苯乙烯装置作为研究对象,以目前国际上普遍采用的健康风险评价四段法的步骤,即风险辨识、剂量-反应评价、暴露评价和风险表征等,以苯致癌风险概率作为评价目标进行定量化分析;应用ERDEM软件对内暴露剂量进行数值模拟,采用多阶模型分析暴露剂量与致癌反应之间定量关系;针对暴露与风险的不确定性,采用Crystal ball蒙特卡洛模拟方法分析概率分布规律。结果该装置工人苯暴露的致癌风险明显超过了美国EPA制定的人体致癌风险值1×10-6,需要采取相关措施降低风险。结论利用ERDEM暴露分析软件及crystal ball蒙特卡洛模拟软件对内暴露剂量及风险概率进行数值模拟,可以得到致癌风险值的概率分布及其统计分布特征,从而为风险管理者提供更准确的信息。
Objective To quantitatively evaluate the carcinogenic risk of chemical carcinogens, such as benzene, to provide a scientific basis for the prevention and management of occupational hazards and occupational hazards in occupational diseases in our country and to prevent occupational hazards. Methods A 500,000 t / a styrene plant was selected as a research object in a large-scale petrochemical enterprise. Based on the four steps of health risk assessment commonly used internationally, namely risk identification, dose-response evaluation, exposure evaluation and risk characterization And so on, the probability of carcinogenic risk of benzene was used as the quantitative evaluation target. The ERDEM software was used to simulate the internal exposure dose and the multi-order model was used to analyze the quantitative relationship between exposure dose and carcinogenic response. According to the uncertainty of exposure and risk, Crystal ball Monte Carlo simulation method to analyze the law of probability distribution. Results The benzene exposure risk of the device workers significantly exceeded the value of 1 × 10-6 for the human carcinogen set by the U.S. EPA, and related measures are needed to reduce the risk. Conclusions Using ERDEM software and crystal ball Monte Carlo simulation software to simulate the dose and risk probability of internal exposure, we can get the probability distribution of cancer risk value and its statistical distribution, so as to provide more accurate information for risk managers.