纳米二氧化钛分离富集-原子荧光光谱法测定植物样品中的痕量汞  

Determination of Trace Mercury in Plant Samples by Atomic Fluorescence Spectrometry with Nano-TiO_(2)Separation and Enrichment

作　　者：伊凯杰 叶丹丹 章义辰 李成 平华[3] 苗颖 刘亚轩 YI Kaijie;YE Dandan;ZHANG Yichen;LI Cheng;PING Hua;MIAO Ying;LIU Yaxuan(Tianjin Agricultural University,School of Food Science and Biological Engineering,Tianjin 300392,China;Sichuan Technology Business College,School of Light Industry Engineering,Chengdu,Sichuan 611830,China;Beijing Academy of Agriculture and Forestry Sciences,Institute of Agriculyural Quality Standards and Testing Technology,Beijing 100097,China)

机构地区：[1]天津农学院食品科学与生物工程学院,天津300392 [2]四川工商职业技术学院轻工工程学院,成都611830 [3]北京市农林科学院农业质量标准与检测技术研究所,北京100097

出　　处：《中国无机分析化学》2023年第7期671-676,共6页Chinese Journal of Inorganic Analytical Chemistry

基　　金：农业农村部农产品质量安全监管专项(15208026);北京市农林科学院财政追加专项(CZZJ202102)。

摘　　要：随着汞(Hg)污染研究的不断发展,对检测数据准确度的要求也不断提高。原子荧光光谱法(AFS)自诞生以来一直以其独特的优点作为测汞的主流方法,然而部分植物样品中含量极低的汞难以被准确检测,适宜的分离富集方法很少。采用纳米二氧化钛(TiO_(2))动态分离富集-原子荧光光谱法测定植物样品中的痕量汞,对分离富集条件进行了系统研究。在粒径25 nm、过柱溶液pH值为中性、硝酸为洗脱液用酸、硝酸体积分数5%、洗脱液体积30 mL的最优条件下,建立了汞的检测方法,方法检出限0.27 ng/g,相对标准偏差(RSD)为7.2%,并对国家一级标准物质GBW10014a(圆白菜)、GBW10015a(菠菜)进行检测,测定值均符合参考范围。As mercury contamination research continues to develop,so does the demand for accurate detection data.Since its inception,atomic fluorescence spectrometry(AFS)has been the mainstream method for measuring mercury with its unique advantages.However,some plant samples contain very low levels of mercury that are difficult to be detected accurately,and suitable separation and enrichment methods are rare.In this paper,a dynamic separation and enrichment method using titanium dioxide(TiO_(2))nanoparticles and atomic fluorescence spectrometry(AFS)was developed for the determination of trace mercury in plant samples,and the optimum conditions were:particle size 25 nm,pH neutral over-column solution,nitric acid as eluent,5%volume fraction of nitric acid and 30 mL eluent volume.The method was established with the detection limit of 0.27 ng/g and the precision(RSD)of 7.2%.The national level standards GBW10014a(cabbage)and GBW10015a(spinach)were tested and the measured values were in accordance with the reference range.

关 键 词：原子荧光光谱法 植物样品 汞 纳米TiO_(2) 动态分离富集 

分 类 号：O657.31[理学—分析化学] TH744.16[理学—化学]