Watts R R, Wallingford K M, Williams R W, House D E, Lewtas J
U.S. Environmental Protection Agency, National Health and Environmental Effects Research Laboratory, Research Triangle Park, North Carolina 27711, USA.
J Expo Anal Environ Epidemiol. 1998 Apr-Jun;8(2):213-29.
Personal exposure monitoring was conducted for road paving workers in three states. A research objective was to characterize and compare occupational exposures to fine respirable particles (< 2.5 microns) and particle-bound polycyclic aromatic hydrocarbons (PAHs) for road paving workers applying conventional (petroleum derived) asphalt and asphalt containing crumb rubber from shredded tires. Workers not exposed to asphalt fume were also included for comparison (to support the biomarker component of this study). The rubber content of the crumb rubber modified (CRM) asphalt at the three study sites was 12, 15, and 20%. A comparison of some specific job categories from two sites indicates greater potential carcinogenic PAH exposures during CRM asphalt work, however, the site with the greatest overall exposures did not indicate any differences for specific jobs. A statistical analysis of means for fine particle, pyrene and total carcinogenic PAH personal exposure shows, with two exceptions, there were no differences in exposures for these three measurement variables. One site shows significantly elevated pyrene exposure for CRM asphalt workers and another site similarly shows greater carcinogenic PAH exposure for CRM asphalt workers. Conventional and CRM asphalt worker airborne exposures to the PAH carcinogen marker, BaP, were very low with concentrations comparable to ambient air in many cities. However, this study demonstrates that asphalt road paving workers are exposed to elevated airborne concentrations of a group of unknown compounds that likely consist of the carcinogenic PAHs benz(a)anthracene, chrysene and methylated derivatives of both. The research described in this article has been reviewed in accordance with U.S. Environmental Protection Agency policy and approved for publication. Mention of trade names or commercial products does not constitute endorsement or recommendation for use.
对三个州的道路铺设工人进行了个人暴露监测。一项研究目标是，对使用传统（石油衍生）沥青和含有来自废旧轮胎的碎橡胶的沥青的道路铺设工人，其职业暴露于可吸入细颗粒物（<2.5微米）和颗粒结合多环芳烃（PAHs）的情况进行表征和比较。未暴露于沥青烟雾的工人也被纳入比较范围（以支持本研究的生物标志物部分）。三个研究地点的碎橡胶改性（CRM）沥青的橡胶含量分别为12%、15%和20%。对两个地点的一些特定工作类别进行比较表明，在CRM沥青作业期间，潜在致癌PAH暴露的可能性更大，然而，总体暴露量最大的地点在特定工作方面并未显示出任何差异。对细颗粒物、芘和总致癌PAH个人暴露均值的统计分析表明，除了两个例外情况，这三个测量变量的暴露量没有差异。一个地点显示CRM沥青工人的芘暴露显著升高，另一个地点同样显示CRM沥青工人的致癌PAH暴露量更大。传统沥青和CRM沥青工人空气中PAH致癌物标志物苯并[a]芘的暴露量非常低，其浓度与许多城市的环境空气相当。然而，本研究表明，沥青道路铺设工人暴露于空气中一组浓度升高的未知化合物中，这些化合物可能包括致癌PAHs苯并[a]蒽、屈以及两者的甲基化衍生物。本文所述研究已按照美国环境保护局的政策进行审查并批准发表。提及商品名或商业产品并不构成对其使用的认可或推荐。
