Geochemical characteristics of copper in soil of Qintang district, Guigang city, Guangxi and its ecological health research
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摘要:
研究目的 铜（Cu）是人体必需的微量元素之一，适量摄入Cu十分重要，但缺乏或过量摄入Cu，对人体健康也有损害。因此，通过获知每个人日摄入Cu含量范围，进而确定农产品与土壤的Cu含量最佳范围对保障人体健康至关重要。
研究方法 本文以广西贵港市覃塘区为研究区，依据研究区内居民膳食结构调查结果，以及1∶5万土地质量地球化学调查获取的土壤、农作物及根系土中Cu含量，研究了土壤与水稻籽实中Cu含量特征与空间分布规律，分析了水稻籽实吸收Cu元素的影响因素，研究构建了水稻籽实Cu含量预测模型，推算出研究区内安全开发、种植水稻的土壤Cu含量最佳范围。
研究结果 研究区土壤Cu含量范围为6~74 mg/kg，平均值、中位值分别为28 mg/kg、26 mg/kg，仅有1.6%超过了GB15618中规定的Cu含量风险筛选值，且主要分布在碳酸盐岩出露区，该地区土壤中普遍发育铁锰结核，土壤Cu等重金属生物活性较低。研究区水稻Cu含量范围为0.790~4.440 mg/kg，平均值、中位值为2.452 mg/kg、2.718 mg/kg，60件水稻样品均未超过NY861-2004规定的Cu限量值。
结论 研究区内为保障人体健康、降低生态风险的水稻Cu含量最佳范围为0.615~8.204 mg/kg。研究区内安全开发、种植水稻的土壤Cu含量最佳范围为684 mg/kg。
Abstract:This paper is the result of environmental geological survey engineering.
Objective Copper (Cu) is an essential trace element for humans, while moderate intake of Cu is important, deficiency or overdose of Cu can also be harmful to human health. Therefore, it is important to determine the optimal range of Cu content in agricultural products and soil by knowing the range of daily Cu intake for each person to safeguard human health.
Methods In this paper, taking the Qintang District of the Guigang City of Guangxi as the study area, based on the investigation results of the dietary structure survey of the residents in Guangxi and the Cu content in the soil, crops, and root soil obtained from the 1∶50000 land quality geochemical survey, the characteristics and spatial distribution of Cu content in the soil and rice were studied, the influencing factors of Cu absorption by rice are analyzed. A prediction model for the Cu content of rice was proposed and derived the optimal range of soil Cu content was for the safe development and cultivation of rice in the study area.
Results The results showed that the soil Cu content in the study area ranged from 6~74 mg/kg, with mean and median values of 28 mg/kg and 26 mg/kg, respectively. Only 1.6% exceeded the risk screening value of Cu content specified in GB15618, and it is mainly distributed in the carbonate rock outcropping area. Fe-Mn nodules are widely distributed in this area, and the soil's biological activity of heavy metals such as Cu is relatively low. The range of rice Cu content in the study area is 0.790~4.440 mg/kg; the mean and median values are 2.452 mg/kg and 2.718 mg/kg, and 60 rice samples do not exceed the limit value of Cu specified in NY861- 2004.
Conclusions To protect human health and reduce ecological risks, the optimal range of copper intake in rice is 0.615~8.204 mg/kg. The prediction model of Cu content in rice is established, and it is concluded that the optimal range of safe development of copper in soil and rice cultivation is 6~84 mg/kg.
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表 1 广西城乡居民18岁以上人群各类食物摄入量（g/人日）
Table 1. Food intake of people over 18 years old in urban and rural areas of Guangxi (g/day)
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表 3 土壤样品元素全量分析方法准确度和精密度要求
Table 3. Accuracy and precision requirements of analytical method for total elements in soil
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表 4 土壤样品元素分析方法准确度和精密度
Table 4. Accuracy and precision of analytical method for elements in soil samples
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表 6 农作物样品分析方法准确度和精密度
Table 6. Accuracy and precision of analytical method for elements in crop samples
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