期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 543, 期 -, 页码 620-627出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2015.10.126
关键词
PCBs; Rice; TEQs; Human health risks; Pakistan
The current study presents health risk surveillance by investigating the levels of polychlorinated biphenyls (PCBs) in rice (Otyza sativa L.) grains and rice straw. Samples were collected from four districts (Okara, Sahiwal, Lahore and Sheikhpura) of Punjab Province, Pakistan for congener specific analysis of PCBs, and to observe the spatial distribution pattern and point sources. Level of Sigma(30) PCB (ng g(-1)) in rice grains and rice straw ranged from 4.31 to 29.68 and 6.11-2535, respectively. Tetra-CBs were found predominant in rice straw (49%) and grains (38%) over other PCB homologs. No significant variation (P>0.005) was observed for most of the screened PCBs congeners except, PCB-66, -77, -60, -101, -74, -138, -153 and -105 in rice grains and PCB-66 in rice straw. Reported toxicity equivalency (TEQ) values for dioxin like PCBs in rice grains were found lower than the previously published reports from Asian countries, however higher TEQ values are reported for rice straw in this study. Health was found at risk of cancer among one in million by consumption of the study area food stuffs, though no considerable carcinogenic risks to human health was found. (C) 2015 Elsevier B.V. All rights reserved.
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