Effect of Organic Matter in Water Samples on the Hydrogen Stable Isotope Ratio Determination by Thermal Conversion/Elemental Analysis-Isotope Ratio Mass Spectrometry

Xin-li HAO; Si-hang HAN; Lei YANG; Yi-zhu DAI; Lu-yao HUANG; Jing-zheng WANG

doi:10.15898/j.cnki.11-2131/td.201811150121

2019 Vol. 38, No. 5

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Xin-li HAO, Si-hang HAN, Lei YANG, Yi-zhu DAI, Lu-yao HUANG, Jing-zheng WANG. Effect of Organic Matter in Water Samples on the Hydrogen Stable Isotope Ratio Determination by Thermal Conversion/Elemental Analysis-Isotope Ratio Mass Spectrometry[J]. Rock and Mineral Analysis, 2019, 38(5): 503-509. doi: 10.15898/j.cnki.11-2131/td.201811150121

Citation:

Xin-li HAO, Si-hang HAN, Lei YANG, Yi-zhu DAI, Lu-yao HUANG, Jing-zheng WANG. Effect of Organic Matter in Water Samples on the Hydrogen Stable Isotope Ratio Determination by Thermal Conversion/Elemental Analysis-Isotope Ratio Mass Spectrometry[J]. Rock and Mineral Analysis, 2019, 38(5): 503-509. doi: 10.15898/j.cnki.11-2131/td.201811150121

Effect of Organic Matter in Water Samples on the Hydrogen Stable Isotope Ratio Determination by Thermal Conversion/Elemental Analysis-Isotope Ratio Mass Spectrometry

1.
School of Water Resources & Environment, Hebei GEO University, Shijiazhuang 050031, China
2.
Hebei Province Key Laboratory of Sustained Utilization & Development of Water Recourse, Hebei GEO University, Shijiazhuang 050031, China
3.
Hebei Province Collaborative Innovation Center for Sustainable Utilization of Water Resources and Optimization of Industrial Structure, Hebei GEO University, Shijiazhuang 050031, China

Received Date: 15 November 2018

Revised Date: 08 March 2019

Accepted Date: 09 April 2019

Abstract

Abstract

BACKGROUNDIn the study of hydrology and water resources, the hydrogen stable isotope ratio (δ²H) of water is an important detection parameter, and its changing patterns can be used to identify and quantify the source of water, and reveal the evolution process and formation mechanism of the water cycle. Therefore, the accuracy of δ²H value is very important, which promotes the development of isotope detection technology. High-temperature combustion pyrolysis-element analysis isotope ratio mass spectrometry is a highly efficient and accurate method for the determination of hydrogen isotopes. It is suitable for the detection of water samples containing organic matter. OBJECTIVESTo explore the influence of organic matter content in water on the hydrogen stable isotope ratio (δ²H) and establish a relationship curve between them. Use the relationship to modify the δ²H value of H₂O and trace the organic source in organic polluted water. METHODSThermal conversion/elemental analysis-isotope ratio mass spectrometry (TC/EA-IRMS) was used as the main detection method. Ethanol water samples with different volume ratios (r) were prepared, and the δ²H values of the samples were determined by TC/EA-IRMS. Taking r and δ²H as variables, the curve relationship and equation were established. RESULTSA good linear relationship was established by using the ethanol content and the δ²H value as variable with R² of 0.9996, indicating that the organic matter in the water sample will linearly change the δ²H value. As the organic matter content increased, the δ²H value measured by the water sample gradually shifted toward the δ²H value of the organic matter. Using this linear relation, the δ²H value of H₂O in the sample can be corrected when the volume ratio of the organic matter is known. Taking the ethanol experiment as an example, the relative error between the corrected result and the true value was 1.7%. By correcting, the δ²H value of the water molecules in the water sample can be obtained, which helped to accurately understand the state and regularity of the water cycle. At the same time, the linear relationship can also be used to trace the source of the organic matter. In the ethanol experiment that simulated the traceability of the source ethanol, the relative error was only 0.4%. CONCLUSIONSThe linear relationship between organic matter and δ²H has a good application prospect in organic matter tracing.
- stable isotope ratio mass spectrometry /
- thermal conversion/elemental analysis /
- hydrogen stable isotopes /
- ethanol /
- organic matter tracing

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