Citation: ZHOU Qiao-Li, GUO Peng-Ran, PAN Jia-Chuan, LEI Yong-Qian, LIU Ning. Activated Carbon Enrichment Combined with Pyrolysis Zeeman Atomic Absorption Spectroscopy for Determination of Trace Amounts of Mercury in Water[J]. Chinese Journal of Analytical Chemistry, ;2016, 44(8): 1270-1276. doi: 10.11895/j.issn.0253-3820.160247 shu

Activated Carbon Enrichment Combined with Pyrolysis Zeeman Atomic Absorption Spectroscopy for Determination of Trace Amounts of Mercury in Water

Guangdong Provincial Public Laboratory of Analysis Testing Technology, Guangdong Provincial Key Laboratory of Emergency Test for Dangerous Chemicals, China National Analytical Center(Guangzhou), Guangzhou 510070, China

Received Date: 31 March 2016
Revised Date: 6 June 2016

Fund Project: This work was supported by the National Natural Science Foundation of China (No.21307120)

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A method for determination of trace mercury in water was established. The trace mercury in water was adsorbed quantitatively by activated carbon, and then determined by electrical pyrolysis atomic absorption spectrometry. In comparison with the detection methods of total mercury in water at present, the method avoids the steps of digestion, reduces the mercury pollution and the loss of the mercury, and is simple in operation. The effects of particle size of activated carbon, acid treatment method, acid medium and enrichment time on the enrichment efficiency were investigated. The effect of the pyrolysis temperature and the interfering ions on the determination results was investigated. Three standard addition procedures including activated carbon blank addition, solution blank addition and environmental water samples addition were studied. Regression correlation coefficients of three standard curves drawn by the three methods reached 0.9999. The slope of the three standard curves had no difference by statistical test, indicating that the determination of mercury in environmental water samples under the experiment conditions was not interfered by the coexistent elements, which showed that the activated carbon blank addition method could be directly used for preparing standard curve of the method. The water samples containing 5 ng/L and 50 ng/L mercury were determined by the method, and the relative standard deviation were 7.2% and 4.2% (n=11), respectively, with a detection limit of 1.2 ng/L. The recovery experiment was carried out after adding 10 ng/L mercury to the surface water and tap water samples, and the recoveries were between 92.0% and 103.0%. Analysis results were compared with ICP-MS as control and the deviation of the two methods were between 2.9% and 3.4%, indicating that the method was accurate and reliable, and had good precision.
- Water,
- Mercury,
- Activated carbon enrichment,
- Pyrolysis,
- Zeeman atomic absorption spectrometry
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