Our scientific researchers establish a high-precision method for determination of mercury isotope composition

Recently, researchers from the Institute of Geochemistry of the Chinese Academy of Sciences have conducted detailed and systematic studies on the isotope geochemical cycle of mercury in the Wanshan mercury mining area in Guizhou. They found an effective tool for tracing the source of mercury in the soil, and found that mercury migration and transformation in the rice body can cause large mercury isotope changes, and the mercury ore smelting process can cause mercury isotope fractionation.

It is understood that Feng Xinbin's research group of the State Key Laboratory of Environmental Geochemistry has taken the lead in establishing a high-precision method for the determination of mercury isotope composition in China. At present, the technology has been successfully applied to trace research on mercury pollution sources in typical ecosystems.

Recently, researchers have determined the mercury isotope composition of the surface soil in different mercury contaminated areas in Guizhou Province, and found that there are different mercury isotope composition characteristics of mercury in different mercury contaminated areas. Studies have confirmed that the two-dimensional system of mercury mass isotope "mass fractionation (MDF)-non-mass fractionation (MIF)" may become an effective tool for tracing soil mercury sources in the future. In particular, the MIF characteristics of mercury isotopes play an important role in tracking and quantifying the contribution rate of atmospheric mercury in surface soils.

Another study found that large mercury isotope fractionation can occur during the migration and transformation of mercury in rice, which laid the foundation for further explanation of mercury migration and transformation in plants. By measuring the isotopic composition of soil mercury and atmospheric mercury separately, the researchers obtained a binary isotope mixed model of mercury in different parts of rice plants, and estimated the relative atmospheric mercury relative to the strength of non-mass fractionation of mercury isotopes in different parts of rice. proportion.

The researchers also determined the mercury ore and mercury smelting waste samples from the Wanshan Mercury Mine and found that the mercury ore smelting process can lead to mass fractionation of mercury isotopes, which is of great significance to the environmental effects of different mercury pollution sources in trace mercury mines. They also extracted bioavailable mercury from the soil of the mercury mining area, and determined the mercury isotopic composition, which provided an important basis for mercury-contaminated soil remediation technology.

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