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| Determination of mercury in soil by cold atomic absorption spectrometry with aqua regia digestion |
| Received:June 09, 2019 Revised:July 07, 2019 |
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| DOI：doi:10.3969/j.issn.2095-1035.2020.01.007 |
| KeyWord:Aqua regia digestion;Cold atomic absorption;Atomic fluorescence; Mercury; Soil |
| Author | Institution |
| Liu Jing-long |
铜陵市环境监测中心站,安徽 铜陵 24400 |
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| Abstract: |
| In order to find a more suitable test method for determination of mercury content in soil, cold atomic absorption spectrometry with low detection limit and high precision was combined with convenient and efficient aqua regia water bath digestion method to establish aqua regia digestion - cold atomic absorption spectrometry. To evaluate the effectiveness of the new method, the linear correlation, detection limit, accuracy, precision and standard recovery were determined,which was compared with atomic fluorescence spectrometry. Aqua regia digestion - cold atomic absorption spectrometry showed good linearity in the range of mercury mass concentration 0.0~1.0 g/L, and the detection limit of the method is 0.00075mg/kg, the relative standard deviation of soil standard sample test is 4.0%~10.7%, and the standard recovery of solid samples is 93%~104%, respectively. The detection limit of atomic fluorescence method was 0.0025 mg/kg, the relative standard deviation was 4.8%~13.5%, and the standard recovery was 104%~107%. The results showed that the method of dissolved soil in aqua regia bath was not only suitable for the determination of mercury content by atomic fluorescence method, but also suitable for cold atomic absorption method.The method has lower detection limit, better accuracy and precision, and is beneficial to improve the testing efficiency of soil samples, which is worth popularizing. |
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