Sun Chaoyang: REE carbonate rocks test methods

December 7 , Zhejiang sixth academic report analyzing test was held in Hangzhou. The meeting by the Zhejiang large scientific instruments and analytical writing shared management office hosted Testing Association , Zhejiang Province , attracting industry experts , efficient, and many famous enterprises on behalf of more than 600 active participants , to discuss environmental monitoring , food safety, health and quarantine application and development of instruments and other fields . During the meeting, Sun Chaoyang from the Institute of Geology and Mineral Resources of Zhejiang Province as a " test method REE carbonate rocks " reports.

We know that the determination of rare earth elements for geological age, explain the causes of the demo minerals , diagenesis and mineralization of geochemical conditions , material sources , magma evolution provide useful information. As a geochemical study of rocks and minerals , " showing Chen agent" is widely used in the field of modern geological science , and REE and trace elements can help restore a variety of original rock characteristics determine the tectonic setting of its formation.

Spectrophotometry is commonly used test methods of rare earth elements , rare earth elements are widely used in various types of analysis and testing samples . With the continuous improvement of synthesis technology , many new chromogenic reagent REE be applied , although the sensitivity and selectivity spectrophotometry has been greatly improved , the stability has also been enhanced , but still can not meet the requirements of the detection limit difficult to achieve measured REE component . Although genetic spectrophotometric simultaneous realization of multi-component determination of rare earth , but to chemometrics , operate more complicated, in practical applications easily restricted. The biggest drawback XRF determination of rare earth elements is less than the detection limit , it is difficult to test geological samples used in the analysis of trace rare earth.

Inductively coupled plasma atomic emission spectrometry (ICP-AES) has the advantage of a wide range of linear and multi-element determination , has become an important means of analysis of rare earth elements , but the direct determination of analytical sensitivity can not meet the requirements , then , there is more severe matrix effects , spectral interferences and other issues. Therefore, these methods have lost their superiority , unable to meet the current Analysis of Rare Earth testing requirements.

Finally Sun Chaoyang come Summary: Inductively Coupled Plasma Mass Spectrometry (ICP-MS) with high sensitivity , low detection limit , can be directly measured REE carbonate rocks . For some carbonate rocks, using hydrochloric acid, nitric acid, hydrofluoric acid, lactic acid, sulfuric acid decomposition easily lead portion of the heavy rare earth analysis of low sodium oxide should be melted decomposition. Since no suitable means of chemical separation of europium barium content will bring high sample error Jiaotong University , the exact exchange resin separation should be determined by barium or measured using high-resolution ICP-MS .


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