Ultratrace mercury speciation analysis in rice by in-line solid phase extraction - liquid chromatography - atomic fluorescence spectrometry
文献类型： 外文期刊
作者： Yao, Zhenzhen 1 ; Liu, Jixin 1 ; Mao, Xuefei 1 ; Chen, Guoying 4 ; Ma, Zhihong 3 ; Li, Bingru 3 ;
作者机构： 1.Chinese Acad Agr Sci, Inst Qual Stand & Testing Technol Agroprod, Beijing 100081, Peoples R China
2.Minist Agr & Rural Affairs, Key Lab Agrofood Safety & Qual, Beijing 100081, Peoples R China
3.BAAFS Beijing Acad Agr & Forestry Sci, Inst Qual Stand & Testing Technol, Beijing 100097, Peoples R China
4.ARS, USDA, Eastern Reg Res Ctr, 600 E Mermaid Lane, Wyndmoor, PA 19038 USA
5.Beijing Abil Technol Co Ltd, Beijing 100081, Peoples R China
关键词： Mercury speciation; Rice; In-line solid phase extraction; Liquid chromatography - atomic fluorescence spectrometry
期刊名称：FOOD CHEMISTRY （ 影响因子：9.231； 五年影响因子：8.795 ）
ISSN： 0308-8146
年卷期： 2022 年 379 卷
页码：
收录情况： SCI
摘要： For the first time, Hg2+ and methylmercury speciation analysis was accomplished by in-line SPE-LC-AFS. After modification with 0.1 mL of 0.001% (m:v) sodium diethyldithiocarbamate, a C-18 microcolumn retained Hg2+ and MetHg in rice extract within 3 min; the captured Hg species were separated within 12 min in 0.25% (v:v) 2mercaptoethanol + 60 mmol L-1 (m:v) ammonium acetate + 4% (v:v) acetonitrile. Under optimized conditions, the detection limits were 0.3 ng L-1 for Hg2+ and 0.2 ng L-1 for MetHg, respectively, with 10 mL injection vs. 0.1 mL eluent; in-line SPE achieved similar to 100x enrichment. Method precision and accuracy were satisfactory at < 2% relative standard deviations (RSDs) for 20 ng L-1 of Hg2+ and MetHg and 95-102% recoveries for real rice samples. In-line SPE obviated human involvement and avoided invalid transportation between interfaces, rendering this SPE-LC-AFS method easy, compact, robust, yet sensitive in mercury speciation analysis to uphold food safety.
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