珠三角典型乡镇稻米中重金属含量的测定及污染现状分析  

Study on the Current Situation of Heavy Metal Pollution in Rice from Typical Towns in the Pearl River Delta

作　　者：李盛安 冯敏铃 周嘉诚 文梁洪 LI Shengan;FENG Minling;ZHOU Jiacheng;WEN Lianghong(Zhongshan Food and Drug Inspection Institute,528437 Zhongshan Guangdong,China;Zhongshan Agricul-tural Product Quality and Safety Inspection Institute,528437 Zhongshan Guangdong,China;Agricultural Product Quality and Safety Testing Station in San Township,528463 Zhongshan Guangdong,China)

机构地区：[1]中山市食品药品检验所,广东中山528437 [2]中山市农产品质量安全检验所,广东中山528437 [3]中山市三乡镇农产品质量安全检测站,广东中山528463

出　　处：《粮食加工》2024年第5期101-104,108,共5页Grain Processing

基　　金：中山市社会公益与基础研究项目(2023B2049、2023B2051)。

摘　　要：建立了微波消解-ICP-MS测定稻米中(铬Cr、铅Pb、镉Cd、汞Hg、砷As)5种重金属元素方法。采集珠三角某典型乡镇39份稻米样品,通过微波消解快速处理稻米,对其中5种重金属元素进行监测分析,优化ICP-MS仪器参数条件。结果表明:5种金属元素线性关系良好,相关系数r均大于0.9997。检出限分别为0.0007~0.0025 mg/kg,相对标准偏差(RSD)为2.5%~4.3%之间。加入国家标准物质进行加标回收试验,回收率为81.9%~110.7%,该方法具有较好的加标回收率,准确性能满足日常相关分析检测工作要求。该镇稻米春季(早造)、夏季(晚造)均未检出重金属铅元素,根据《食品安全国家标准食品中污染物限量》(GB 2762—2022)的限量指标,该镇稻米5种重金属均未超过限量标准。This article establishes a microwave digestion ICP-MS method for the determination of five heavy metal elements(chromium Cr,lead Pb,cadmium Cd,mercury Hg,arsenic As)in rice.39 rice samples were collected from a typical township in the Pearl River Delta,and the rice was rapidly treated by microwave digestion.5 kinds of heavy metal elements were monitored and analyzed,and the parameters of ICP-MS instrument were optimized.The results showed that the five metal elements had a good linear relationship,and the correlation coefficient r was greater than 0.9997.The detection limits are 0.0007~0.0025 mg/kg and the relative standard deviation(RSD)is between 2.5%~4.3%.Adding national standard substances for spiked recovery experiments resulted in a recovery rate of 81.9%~110.7%.This method has a good spiked recovery rate and meets the accuracy requirements of daily related analysis and detection work.The heavy metal lead was not detected in the rice of the town in spring(early harvest)and summer(late harvest).According to the limit indicators of the National Food Safety Standard for Pollutants in Food(GB 2762—2022),all five heavy metals in the rice of the town did not exceed the limit standards.

关 键 词：微波消解 ICP-MS 稻米 重金属 

分 类 号：TS207[轻工技术与工程—食品科学]