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| Determination of organic carbon in chlorine-containing geological samples by sulfuric acid pre-heating and volumetric method |
| Received:April 21, 2021 Revised:April 26, 2021 |
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| DOI：10.3969/j.issn.2095-1035.2021.05.007 |
| KeyWord:sulfuric acid pre-heating, chlorine-containing geological samples, organic carbon |
| Author | Institution |
| Wang Xin |
河北省地质实验测试中心 |
| Zhang Jinming |
河北省地质实验测试中心 |
| YANG Jinrong |
1.河北省地质实验测试中心;2.河北省矿产资源与生态环境监测重点实验室 |
| YUAN Zhiwei |
1.河北省地质实验测试中心;2.河北省矿产资源与生态环境监测重点实验室 |
| GAO Lu |
1.河北省地质实验测试中心;2.河北省矿产资源与生态环境监测重点实验室 |
| GE Min |
1.河北省地质实验测试中心;2.河北省矿产资源与生态环境监测重点实验室 |
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| Abstract: |
| The presence of chloride ion affects the determination of organic carbon which leading to high results. In this paper, the samples were dissolved ore system which was preheated by sulfuric acid and oxidized by potassium dichromate.And in the process, the chloride ions were converted into hydrogen chloride and volatilized, thus eliminating the interference of chloride ions. The constant temperature electrothermal plate digestion avoided the pollution of oil bath to sample and environment. Based on the quantitative test of chloride ion interference, pre-heating temperature, pre-heating time and other conditions, the best experimental conditions were determined. On the premise of not affecting the normal reaction of organic carbon and potassium dichromate, the interference of chlorine ion on the determination of organic carbon is effectively eliminated, and the accurate determination of organic carbon in geological samples containing chlorine is realized. After the determination of the national standard chlorine-containing reference materials such as soil reference materials and marine sediments，the relative error was less than 1.50% and the relative standard deviation was less than 7.28%.This method which has good reproducibility, high accuracy, simple operation and no secondary pollution to the environment, is easy to spread and apply. |
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