Citation: ZHAO Jian, ZHANG Lin-Nan, LEI Yong-Qian, PAN Jia-Chuan, GUO Peng-Ran. Determination of Trace Total Mercury in Water by Headspace Solid Phase Microextraction and Electropyrolytic Zeeman Atomic Absorption Spectrometry[J]. Chinese Journal of Analytical Chemistry, ;2021, 49(8): 1393-1401. doi: 10.19756/j.issn.0253-3820.211133 shu

Determination of Trace Total Mercury in Water by Headspace Solid Phase Microextraction and Electropyrolytic Zeeman Atomic Absorption Spectrometry

ZHAO Jian ^1,2,3 ,
ZHANG Lin-Nan ¹ ,
LEI Yong-Qian ^2,3 ,
PAN Jia-Chuan ^2,3 ,
GUO Peng-Ran ^2,3,,

1.
School of Environmental and Chemical Engineering, Shenyang University of Technology, Shenyang 110870, China;
2.
Guangdong Provincial Key Laboratory of Emergency Test for Dangerous Chemicals, Institute of Analysis, Guangdong Academy of Sciences, China National Analytical Center, Guangzhou 510070, China;
3.
Guangdong Provincial Engineering Research Center for Online Monitoring of Water Pollution, Institute of Analysis, Guangdong Academy of Sciences, China National Analytical Center, Guangzhou 510070, China

Corresponding author: GUO Peng-Ran, prguo@fenxi.com.cn
Received Date: 20 February 2021
Revised Date: 27 May 2021

Fund Project: Supported by the National Natural Science Foundation of China (No.21777150), the Guangdong Provincial Key Research Development Programme (No.2020B1111350002) and the Scientific and Technological Project of Guangzhou (No.201803030042).

A new and portable method for extraction, enrichment and detection of trace total mercury in water by a headspace solid phase microextraction probe loaded with gold and wood stickswas developed. The surface morphology and elemental composition of the gold-loaded probe were characterized by scanning electron microscopy and energy dispersive analysis (SEM-EDS). The effects of solution pH, salinity, dissolved organic matter (DOM) concentration and co-existing metal ions on SnCl₂ reduction of different forms of mercury (inorganic mercury, methyl mercury and ethyl mercury) were investigated. The results showed that the pH, salinity and DOM concentration of the solution had only weak effect on the reduction of different forms of mercury by SnCl₂. Except for Cu²⁺, low concentration of metal ions (≤1 mg/L) had little effect on reduction of different forms of mercuryby SnCl₂. High concentrations (100 mg/L) of Fe³⁺, Zn²⁺, Ni²⁺, As³⁺, Cr³⁺, Cu²⁺, V⁵⁺ and Pb²⁺ inhibited the reduction of organic mercury to different degrees by SnCl₂, especially V⁵⁺and Pb²⁺. The relative standard deviations (RSD, n=10) for reduction of inorganic mercury, MeHg and EtHg in solution by SnCl₂ were 3.0 %, 3.7 % and 3.5 %, respectively, indicating that the stability of three forms of mercury in SnCl₂ solution was good. The detection limit (LOD) of the method for total mercury in water was 0.03 μg/L, the RSD was less than 6.1% (n=6) and the standard recoveries was between 82.0% and 90.0%. This method was simple, less time-consuming and stable and could be applied to the detection of trace total mercury in surface water and tap water.
- Headspace solid phase microextraction,
- Electropyrolytic Zeeman atomic absorption spectrometry,
- Water,
- Trace total mercury
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