DMA-80直接测汞仪测定食品中总汞含量  

Determination of Total Mercury in Food Samples by DMA-80 Direct Mercury Analyzer

作　　者：刘华 许文琪 赵华楠 洪丽 徐清 李邦进 王诗凝 许锦华 Liu Hua;Xu Wen-qi;Zhao Hua-nan;Hong Li;Xu Qing;Li Bang-jin;Wang Shi-ning;Xu Jin-hua(Fujian Inspection and Research Institute for Product Quality,Fuzhou,Fujian 350002,China)

机构地区：[1]福建省产品质量检验研究院,福建福州350002

出　　处：《福建分析测试》2024年第4期49-53,共5页Fujian Analysis & Testing

摘　　要：随着新版国家标准CB5009.17-2021的发布,直接进样测汞法作为第二法应用于食品中汞元素的检测。为了对直接进样测汞法进行方法验证,本文主要研究了DMA-80直接测汞仪测定不同基质样品中总汞含量的应用。通过多基质多水平加标回收实验、精密度实验、质控样品的测定,以及与原子荧光光谱法比对实验,多途径验证了直接进样法的准确性和稳定性。结果显示:该方法在0~30ng和40~600ng低高浓度标准曲线范围内均具有良好的线性关系(R^(2)=1.0000;R^(2)=1.0000)。样品的加标回收率在72.0%~109%之间。当称样量为0.10g时,方法检出限为0.00012mg/kg,满足国家标准方法检出限0.0002mg/kg的要求。利用直接进样法对鱼肉泥质控样品P40219进行检测,结果均在特性量值区间;FAPAS比对结果表明,直接进样法结果更接近实验室比对中位值。综上,直接测汞法无需前处理,具有检出限低、稳定性好,准确性高,操作简便快捷的优点,适用于各类食品中总汞含量的分析。With the release of the new National Standard GB 5009.17-2021,the direct sampling method is used as the sec-ond method in the detection of mercury in food.In order to validate the direct sampling method,the application of DMA-80 direct mercury analyzer in the determination of total mercury in different matrix samples was studied in this paper.The accu-racy and stability of the method were verified by the multi-matrix and multi-level recovery experiment,precision experi-ment,quality control sample determination and atomic fluorescence spectrometry comparison experiment.The results show that the method had a good linear relationship in the range of standard curves of low and high concentrations of 0-30 ng and 40-600 ng(R^(2)=1.0000;R^(2)=1.0000);The recoveries of different samples ranged from 72.0%to 109%.When the sample size is 0.10 g,the detection limit is 0.00012 mg/kg;Meet the national standard method detection limit(0.0002 mg/kg)re-quirements.The quality control samples were determined many times,and the results were all in the characteristic value range.The results of FAPAS comparison show that the direct sampling method is more close to the median value of the labo-ratory comparison.In a word,direct determination of mercury does not need pre-treatment,low detection limit,good stabili-ty,accurate results,simple and rapid operation,suitable for all kinds of food analysis of total mercury.

关 键 词：汞 直接测汞仪 食品 

分 类 号：O657.31[理学—分析化学]