东莞Cd轻度污染土壤种植水稻安全风险评估  

Safety Risk Assessment of Rice Planting on Cd Slightly Polluted Soil in Dongguan

作　　者：倪卫东 朱凰榕 冯先翠 焦洪鹏 江海燕 NI Wei-dong;ZHU Huang-rong;FENG Xian-cui(Guangdong Province Research Center for Geoanalysis,Guangzhou,Guangdong 510080)

机构地区：[1]广东省地质实验测试中心,广东广州510080

出　　处：《安徽农业科学》2022年第10期41-45,共5页Journal of Anhui Agricultural Sciences

基　　金：广东省财政地勘事业发展经费项目(2016206);国土资源部公益性行业科研专项(201511082);广东省省级环境保护专项项目(粤环[2014]126号)。

摘　　要：[目的]更好地了解东莞重金属污染农田种植粮食的安全风险。[方法]选择在东莞典型的工业聚集区附近的一处轻度Cd污染农田,种植珠江三角洲地区常种的水稻品种天优390,试验区面积共0.33 hm^(2),对产出的糙米进行重金属含量安全风险评估。[结果]试验区土壤Cd全量为0.46~0.71 mg/kg, pH为6.65~7.33,Cd有效态含量为0.12~0.24 mg/kg,且Cd有效态含量占全量的23.1%~33.8%。在试验区的5个田块中,只有1个田块的水稻糙米Cd含量(0.13 mg/kg)低于《食品安全国家标准》(GB 2762—2017)的限量值(0.2 mg/kg);其他4个田块中水稻糙米Cd含量达到0.21~0.30 mg/kg,超过了食品安全国家标准限量值,超标率达到了80%。[结论]在东莞pH偏中性的Cd轻度污染土壤中种植水稻存在很高的安全风险,不适合直接种植水稻,需结合土壤重金属修复技术才能实现安全利用。[Objective] To better understand the safety risks of planting food on farmland contaminated by heavy metals in Dongguan.[Method]Choose a neutral, mildly Cd-polluted farmland near a typical industrial cluster in Dongguan to plant Tianyou 390, a rice variety commonly grown in the Pearl River Delta.The test area was 0.33 hm^(2), and the safety risk assessment of the heavy metal content of the produced brown rice was carried out.[Result]The total amount of Cd in the soil in the test area was 0.46-0.71 mg/kg, the pH was 6.65-7.33, the content of Cd available state was 0.12-0.24 mg/kg, and the content of Cd available state accounted for 23.1%-33.8% of the total amount.Among the 5 plots in the experimental area, only one plot had rice brown rice Cd content(0.13 mg/kg) lower than the limit value(0.2 mg/kg) of the National Food Safety Standard(GB 2762-2017);the Cd content of rice brown rice in the other four fields reached 0.21-0.30 mg/kg, exceeding the limit value of the national food safety standard, and the exceeding rate reached 80%.[Conclusion]Planting rice in the mildly polluted Cd soil with neutral pH in Dongguan poses a high safety risk.It is not suitable for direct planting of rice, and it needs to be combined with soil heavy metal remediation technology to achieve safe use.

关 键 词：Cd轻度污染土壤 水稻 安全风险评估 

分 类 号：X825[环境科学与工程—环境工程]