都安县玉米籽粒重金属累积特征与健康风险评价

采集广西都安瑶族自治县19个乡镇64片玉米种植区中玉米,分析和评价了其重金属超标状况和人体健康风险,为当地的粮食安全生产提供科学依据.结果表明,都安县玉米籽粒中Pb和Zn均超标,其超标率分别为7.81%和4.69%,总超标率为10.9%;都安县部分玉米对Pb的富集能力较高,在高岭、地苏和东庙三个乡镇需关注玉米Pb污染风险.玉米籽粒健康风险评价结果表明,都安县玉米中重金属对人体的高危商和高危指数均小于1,尚未对人体健康构成威胁.

Accumulation Characteristics and Health Risk Assessment of Heavy metals in Corn Kernel in Du'an Yao Autonomous County

Earlier studies have found serious heavy metal pollution in soils collected from Du'an Yao Autonomous County in Guangxi Zhuang Autonomous Region, which has resulted in heavy metal contamination of rice in this area. However, heavy metal contamination in another main crop corn was not documented yet. Here we collected corn and soil samples from 64 planting zones distributed in 19 towns in the County to investigate concentrations of heavy metals including cadmium(Cd), arsenic(As), nickel(Ni), zinc(Zn), chromium(Cr), copper(Cu) and lead(Pb). The potential health risk for local residents was assessed. Lead and Zn content in 7.81% and 4.69% of corn samples was higher than the limits of the National Food Health Standard, respectively, with total 10.9% of corn samples exceeding the standards. According to the Hazard Index(HI), the health risks of corn consumption to people in Du'an County was still at low level, implying that corn could be planted in Du'an County because of its low accumulating ability for heavy metals. However, the potential risk of lead pollution in Gaoling, Disu, and Dongmiao towns should be controlled.