Citation: LYU Zhao-Hui, MAO Xue-Fei. Rapid Determination of Mercury in Soil by Metal Ceramics Electrothermal Vaporization-Atomic Fluorescence Spectrometry[J]. Chinese Journal of Analytical Chemistry, ;2022, 50(9): 1399-1406. doi: 10.19756/j.issn.0253-3820.221197 shu

Rapid Determination of Mercury in Soil by Metal Ceramics Electrothermal Vaporization-Atomic Fluorescence Spectrometry

LYU Zhao-Hui ^1,2 ,
MAO Xue-Fei ^1,2,,

1.
Institute of Quality Standard and Testing Technology for Agro-products, Chinese Academy of Agricultural Sciences, Beijing 100081, China;
2.
Key Laboratory of Agro-food Safety and Quality, Ministry of Agriculture and Rural Affairs, Beijing 100081, China

Corresponding author: MAO Xue-Fei, mxf08@163.com
Received Date: 22 April 2022
Revised Date: 10 May 2022

Fund Project: Supported by the National Key Research and Development Program of China (No.2021YFD2000202) and the Science and Technology Project of Tibet Autonomous Region, China (No.XZ202001ZY0048N).

A metal-ceramic heater (MCH) was used for the first time as a solid direct sampling electrothermal vaporizer (ETV), and a new mercury analyzer was thus fabricated by combining MCH-ETV with an atomic fluorescence spectrometer (AFS). The instrumental conditions, such as vaporization power, atomizer flame, working gas flow rate, etc., were optimized, and a direct solid sampling analysis method for Hg in soil was thereby established without sample digestion. Under the optimal conditions, the detection limit (LOD) of Hg was 0.16 ng/g with sample size of 50 mg, and the regression coefficient (R²) was 0.996 in the linear range of 8-590 ng/g. The Hg values of three soil certified reference materials (CRMs) measured by this method were within their ranges of the certified values; further, the Hg values of the nine real soil samples were consistent with the results by the standard method, and the recoveries were 96%-107%, proving favorable analytical accuracy. Moreover, the relative standard deviations (RSDs) of repeated measurements for real soil samples ranged from 2% to 11%, indicating acceptable analytical precision. Due to canceling gold amalgamation, the whole analysis time of this method was less than 3 min. As well, the MCH-ETV power consumption was below 200 W with a small size, which was thereby suitable for the miniaturization of commercialized mercury analyzer in the future.
- Metal-ceramic heater,
- Electrothermal vaporization,
- Solid sampling,
- Soil,
- Mercury
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