東北師范大學生命科學學院張振興團隊測定了石油化工企業(yè)附近農(nóng)田土壤-植物（玉米）-人類污染途徑中的代表性微量元素污染狀況。相關(guān)成果發(fā)表于Environmental Pollution（IF=5.714）。

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Highlights

·Studied soils were mildly to moderately polluted by Cd, Cu, Zn and Pb.

·Maize grain was threatened mainly by Zn, Cd and Cu.

·Exposure to studied trace elements through soil ingestion showed no risk.

·Hazard Index for children was higher than adults on noncarcinogenic risks.

·Risk assessment indicated As, Cr and Cd as predominant risk factors by maize intake.

Abstract

The trace elements contamination of agricultural soils near petrochemical industry complexes is a concern due to the risk of accumulating in food systems and subsequently affecting human health. We measured representative trace elements (Cu, Ni, Cr, Pb, Zn, Pb, Hg and As) through the soil-plant (maize)-human contamination pathway near a petrochemical industry complexes in an agricultural region from September 20 to 28, 2016. We found that the soil was mildly to moderately polluted by multiple trace elements, which was also confirmed by the contamination factor and enrichment factor values. Cd (enrichment factor = 2.28), Cu (2.75), Zn (1.85) and Pb (1.70) should be given more attention and prioritized over the other trace elements due to their higher potential risks. Furthermore, the trace elements contamination in maize grains was lower than the corresponding limits. The sequence of the transfer coefficient values was Zn > Cd > Cu > Hg > Ni > As > Cr > Pb. Maize grain safety was threatened mainly by Zn, Cd and Cu. There was no risk to humans through soil ingestion, while a potential health risk from maize grain consumption existed. Children were more sensitive than adults to the non-carcinogenic risks of maize grain consumption. Trace element As was found to be the priority metal for risk control. For carcinogenic risk, adults were more sensitive than children; As, Cr and Cd were the priority metals for risk control, with CRmaize values exceeding the risk threshold (1 × 10?4). Overall, strict, intensive monitoring, especially of Cr and Cd, and soil protection measures are needed to prevent any furthertrace elements contamination and to ensure food safety. This study also provides a reference for similar studies worldwide.

石油化工企業(yè)附近農(nóng)業(yè)土壤的微量元素污染是一個令人關(guān)注的問題，因為它可能在食品系統(tǒng)中積累，進而影響人類健康。本研究于2016年9月20日至28日在一個石油化工企業(yè)工業(yè)區(qū)附近的農(nóng)業(yè)用地，測定了土壤-植物（玉米）-人類污染途徑中的代表性微量元素（Cu、Ni、Cr、Pb、Zn、Pb、Hg和As）污染狀況。結(jié)果表明，土壤中存在多種微量元素輕度至中度污染，污染因子和富集因子值也證實了這一點。Cd（富集因子= 2.28）、Cu（2.75）、Zn（1.85）、Pb（1.70）等微量元素潛在風險較大，應重點關(guān)注。此外，玉米籽粒中的微量元素污染低于相應的限值。轉(zhuǎn)移系數(shù)值依次為Zn > Cd > Cu > Hg > Ni > As > Cr > Pb。玉米籽粒主要受Zn、Pb、Cu的威脅。土壤中的微量元素對人體無危害，但食用玉米存在潛在的健康風險。兒童比成人對食用玉米籽粒的非致癌性風險更敏感。微量元素As被認為是最應當優(yōu)先進行風險控制的重金屬。成人對于致癌風險比兒童更敏感；As、Cr和Cd應當優(yōu)先進行風險控制，CRmaize的值超過了風險閾值（1×10?4）。為了防止進一步的微量元素污染，應當對微量元素，特別是Cr和Cd，進行全面、嚴格、嚴密的監(jiān)測，并采取土壤保護措施，以確保食品安全。本研究也為世界范圍內(nèi)類似的研究提供了參考。

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