Colleges of Environmental Science and Engineering, Guilin University of Technology, Guilin, 541004, China.
Environ Geochem Health. 2020 Nov;42(11):3841-3850. doi: 10.1007/s10653-020-00642-y. Epub 2020 Jun 29.
This study studied the dietary structure, lead (Pb) contents and exposure of the diets of the residents in the mining-affected areas of Nandan County in summer (July to August) and winter (November to December). The weighing method and the Chemical Analysis Method were applied to determine the daily intake amount of trace element Pb in the diets of the residents in the mining-affected areas and a contrast area, and subsequently estimated the Pb exposure of the diets of the residents. Based on the Provisionally Tolerable Weekly Intake (PTWI) and Margin of Exposure (MoE), the risk of Pb poisoning driven by the dietary intake of the residents in the study areas was determined. Among the food types, rice and rice products, vegetables, meat and meat products were the major contributing factors. In the mining-affected areas, Pb contents in meat and meat products ranked the top (2.47 μg/g) among the food types. The Pb contents in rice and rice products, vegetables, and meat and meat products in the mining-affected areas were significantly different from those in the contrast area. The average intake amounts of Pb in all kinds of food of the residents in the mining-affected areas (Chehe Town, Dachang Town and Zhanglao Town) were 958.6 µg/d, 1178 µg/d and 813.7 µg/d, respectively. According to the MoE method, current study confirmed high health risk due to Pb contamination in the diets of the residents in these mining-affected areas. From the dietary contribution rate perspective, meat was the main source of Pb intake of the residents in the mining-affected areas. To reduce the health risk induced by excessive Pb exposure in the dietary intake, local residents should consume more fish and grains instead of meat.
本研究在夏季（7-8 月）和冬季（11-12 月）对广西南丹矿区及对照区居民膳食结构、铅（Pb）含量和暴露水平进行了研究。采用称重法和化学分析法分别测定矿区及对照区居民膳食中微量元素 Pb 的日摄入量，并对居民膳食 Pb 暴露水平进行了估算。基于暂定每周耐受摄入量（PTWI）和暴露边际（MoE），对研究区居民膳食摄入 Pb 中毒的风险进行了判定。在食物种类中，米及米制品、蔬菜、肉及肉制品是主要的贡献因素。在矿区，肉及肉制品中的 Pb 含量（2.47μg/g）最高，在矿区和对照区，米及米制品、蔬菜、肉及肉制品中 Pb 含量的差异均有统计学意义。矿区居民各种食物中 Pb 的平均摄入量分别为 958.6μg/d、1178μg/d 和 813.7μg/d。MoE 法评估结果表明，矿区居民膳食中 Pb 污染对健康存在高风险。从膳食贡献率来看，肉是矿区居民 Pb 摄入的主要来源。为降低居民因膳食摄入 Pb 过量而导致的健康风险，当地居民应减少肉的摄入，增加鱼类和谷物的摄入。
