危险系数
环境化学
微粒
健康风险评估
污染物
环境科学
健康风险
遗传算法
化学
重金属
环境卫生
医学
进化生物学
生物
有机化学
作者
Winifred U. Anake,Nsikak U. Benson,I.T. Tenebe,PraiseGod Chidozie Emenike,Godson R. E. E. Ana,Suojiang Zhang
标识
DOI:10.1080/10807039.2018.1504672
摘要
Quantification of PM2.5 (particulate matter <2.5 µm) bound heavy metals and their potential health risks were carried out around a cement manufacturing company in Ewekoro, Nigeria. The PM2.5 samples were collected using Environtech gravimetric sampler. A four-staged sequential extraction procedure was used to fractionate PM2.5 bound chromium (Cr), lead (Pb), aluminum (Al), copper (Cu), and silver (Ag), and further analyzed using inductively coupled plasma mass spectrometry. Chemical speciation results reveal bioavailable levels of Pb (4.05 µg/m3), Cr (10.75 µg/m3), Al (16.47 µg/m3), Cu (4.38E-01 µg/m3), and Ag (1.22E-02 µg/m3) in the airborne particulates. Pb and Cr levels exceeded the World Health Organization allowable limit of 0.5 and 2.5E-05 µg/m3, respectively. The labile phases showed strong indication of the presence of Cr and Cu metal. Excess cancer risks exposure for adults, outdoor workers and children were higher than the acceptable risk target level of 1E-06. Non-carcinogenic health risk estimated using hazard quotients (HQs) and hazard indices (HIs) showed ingestion route within the safe level of HI <1 implying no adverse effect while inhalation route exceeded the safe level for all receptors. Enforcement of pollution control by authorized agencies, and screening of greenbelts as sinks for air pollutants is strongly recommended.
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