Method for determining trace elements and rare earth elements in marine sediments and soil

Abstract

The invention provides a method for determining trace elements and rare earth elements in marine sediments and soil. The method comprises the following steps: drying sediments or soil, and grinding to200 meshes to obtain a sample; putting the sample into an inner container of a polytetrafluoroethylene closed tank, sequentially adding redistilled hydrofluoric acid and redistilled nitric acid, heating for dissolving after sealing, adding redistilled nitric acid, ultrapure water and a rhodium internal standard solution after cooling, sealing, heating for extracting, cooling to room temperature,and adding redistilled nitric acid for fixing the volume to obtain a sample solution; measuring an interference coefficient, drawing a standard curve, and measuring the mass concentration of each element in the sample solution and the blank sample solution by using an inductively coupled plasma mass spectrometer under the same condition; and calculating the mass fractions of the trace elements andthe rare earth elements. According to the method, the sample is digested in a high-temperature and high-pressure closed manner in the reaction kettle, the method has the advantages of complete digestion, low acid consumption, low process blank value and the like, and errors introduced in the pretreatment process of the sample are fully considered, so that the accuracy of the method is improved.

Description

technical field [0001] The invention belongs to the field of chemical detection, in particular to a method for measuring trace elements and rare earth elements in marine sediments and soil. Background technique [0002] The dried and ground marine sediments are similar in appearance to soil, but their components are relatively complex. Common digestion methods include open-open acid dissolution, microwave digestion, and high-temperature alkali fusion. Both open acid solution and microwave digestion have the risk of incomplete digestion of insoluble elements, affecting the accuracy of the measurement of trace and rare earth element content, and the acid gas in the open system is heavy, causing great harm to the health of experimenters; high temperature alkali The melting process is complicated, the total salinity is high, and the matrix interference is serious. [0003] The standard GB / T 20260-2006 stipulates the chemical analysis method for the determination of trace and tr...

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Problems solved by technology

[0002] The dried and ground marine sediments are similar to soil in appearance, but their components are relatively complex. Common digestion methods include open acid dissolution, microwave digestion, high temperature alkali fusion, etc.

Both open acid solution and microwave digestion have the risk of incomplete digestion of insoluble elements, affecting the accuracy of the measurement of trace and rare earth element content, and the acid gas in the open system is heavy, causing great harm to the health of experimenters; high temperature alkali The melting process is complicated, the total salinity is high, and the matrix interference is serious

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