Determination of Trace Mercury in Rocks by Dual-channel Atomic Fluorescence Spectrometry and Solid Sampling-Cold Atomic Absorption Spectrometry

LIN Jian-qi

doi:10.15898/j.cnki.11-2131/td.202006180093

2021 Vol. 40, No. 4

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LIN Jian-qi. Determination of Trace Mercury in Rocks by Dual-channel Atomic Fluorescence Spectrometry and Solid Sampling-Cold Atomic Absorption Spectrometry[J]. Rock and Mineral Analysis, 2021, 40(4): 512-521. doi: 10.15898/j.cnki.11-2131/td.202006180093

Citation:

LIN Jian-qi. Determination of Trace Mercury in Rocks by Dual-channel Atomic Fluorescence Spectrometry and Solid Sampling-Cold Atomic Absorption Spectrometry[J]. Rock and Mineral Analysis, 2021, 40(4): 512-521. doi: 10.15898/j.cnki.11-2131/td.202006180093

Determination of Trace Mercury in Rocks by Dual-channel Atomic Fluorescence Spectrometry and Solid Sampling-Cold Atomic Absorption Spectrometry

LIN Jian-qi

Beijing Haiguang Instrument Co., LTD, Beijing 101312, China

Received Date: 18 June 2020

Revised Date: 30 November 2020

Accepted Date: 28 May 2021

Publish Date: 28 July 2021

Abstract

Abstract

BACKGROUND
The detection of trace mercury in rocks typically provides biased and non-reliable results because of the complex internal unit cell structure, incomplete hot water bath acid hydrolysis extraction, volatilization loss, and contact pollution.
OBJECTIVES
To establish a more effective method for the determination of trace mercury concentrations in rocks.
METHODS
Dual-channel atomic fluorescence spectrometry (AFS) and domestic solid sampling-cold atomic absorption spectrometry (AAS) were used to detect the total concentration of trace mercury in rocks.
RESULTS
Under the optimized conditions of dual-channel AFS, the samples were extracted in a boiling water bath with 80% aqua regia solution for 50min. The current was 30mA, the negative high voltage was 280V, the carrier gas flow was 600mL/min, and the shielding gas flow was 1000mL/min. The concentration range was 0.05-2μg/L, and the linear correlation coefficient was greater than 0.999. The sample weight was 0.2g, method detection limit was 0.285μg/kg, and relative standard deviation was 7.3%-15.3%. For domestic solid sampling-cold AAS, the sample was determined by direct injection without chemical digestion. The carrier gas flow was 180mL/min, pyrolysis process was conducted for 60s at 700℃. The concentration range was determined to be 0.05-5ng, and the linear correlation coefficient was greater than 0.999. The sample weight was 0.1g, method detection limit was 0.046μg/kg, and relative standard deviation was 1.3%-4.2%.
CONCLUSIONS
The solid sampling-cold AAS was found to be more effective than dual-channel AFS in terms of operation, detection limit, and stability. It is more suitable for the determination of trace mercury in rocks.
- rock /
- trace mercury /
- dual-channel atomic fluorescence spectrometry /
- solid sample-cold atomic absorption spectrometry

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References

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