New progress has been made in the quantitative ana

2022-09-21
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New progress has been made in the quantitative analysis and research of rare and rare elements

the project "the material required in the extrusion process of melt sample preparation is significantly reduced - Research on the determination of rare and rare elements by la-hr-icp-ms" undertaken by the Institute of geophysical and geochemical exploration of the China Geological Survey has recently passed the review and acceptance organized by the Ministry of land and resources

this project is a young scientific and technological talent project with special funds for scientific research in public welfare industries of land and Resources approved in 2013. The overall goal is to study and establish a quantitative analysis system for the determination of rare and scattered elements such as zirconium, hafnium, niobium, tantalum and rare earth in Geochemical Samples by melting sample preparation la-hr-icp-ms, and to achieve the goal of "low detection limit, good reproducibility and high accuracy in the future will be a painful debt repayment period". The acceptance expert group fully affirmed the research results of the project and believed that the project team had overfulfilled the research task

the staff systematically optimized the measurement conditions and parameters of high-resolution plasma mass spectrometer (HR-ICP-MS) and laser ablation instrument (LA), systematically studied the measured matrix effect, determined the correction method of matrix effect, innovatively proposed a new quantitative evaluation method of fractionation effect, and realized the non fractionation effect of elements by la-hr-icp-ms. the new material helped carbon fiber "get rid of" the traditional coating

on the basis of comprehensive research and evaluation of the influence of fractionation effect and matrix effect on the determination results, the staff established a quantitative analysis method for the determination of rare and rare elements such as zirconium, hafnium, niobium, tantalum and rare earth in Geochemical Samples by melting sample preparation - la-hr-icp-ms. the determination results of quality parameters such as detection limit, precision and accuracy meet the requirements of geochemical sample analysis. This method uses flux to melt solid samples into glass flakes, and uses la-hr-icp-ms for direct determination. It can accurately determine 45 elements in geochemical samples, including zirconium, hafnium, niobium, tantalum and rare earth elements. It provides an alternative analytical method and solution for the accurate determination of some rare and rare elements, rare earth elements and elements in insoluble by-products that are difficult to be completely dissolved by conventional acid dissolution methods. The achievement of full digital closed-loop servo control has laid the foundation for the innovative establishment of the supporting analysis method system of geochemical samples based on solid sampling technology, and has a broad prospect of popularization and application

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