Method for determination of scandium in bauxite by microwave digestion inductively coupled plasma atomic emission spectrometry

Abstract

The invention provides a method for determination of scandium in bauxite by microwave digestion inductively coupled plasma atomic emission spectrometry. Specifically, a sample is digested through hydrofluoric acid, nitric acid, hydrogen peroxide and phosphoric acid under the action of microwave, ultrapure water is added to a constant volume, an inductively coupled plasma emission spectrometer is employed to determine Sc so as to realize accurate determination of the trace element Sc in the bauxite sample. The method provided by the invention reduces tedious operation process, employs microwave to digest the sample and direct instrument determination, and has no need for acid removal. Compared with the traditional sample processing method, the method provided by the invention has the characteristics of simple operation steps, little reagent consumption, and rapid analysis speed. At the same time, the method employs microwave digestion to decompose the sample, and can greatly lower the reagent dosage, reduce the reagent blank and matrix interference, and improve the sensitivity and accuracy of analysis elements.

Description

technical field [0001] The invention relates to the technical field of analysis and determination, in particular to a method for determining scandium in bauxite by microwave digestion inductively coupled plasma spectrometry. Background technique [0002] Scandium is a typical scattered element, which is widely used in various high-tech fields, but because of its rare content and the difficulty of obtaining high-purity metal scandium, it is expensive. According to statistics, 90-95% of scandium in the world occurs in bauxite, phosphate rock and ferro-titanium ore; therefore scandium, as an associated valuable element in bauxite, has been more and more valued by enterprises for its comprehensive utilization, which can be Increasing the economic benefits of enterprises can also promote environmental protection. [0003] Because bauxite has strong chemical stability and often contains a small amount of corundum, it is a relatively difficult sample to handle. The traditional co...

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Problems solved by technology

[0006] At present, there is a Chinese invention patent document with the publication number CN104111207A and the publication date being October 22, 2014, titled "a method for determining the content of active silicon in bauxite", which discloses the use of sodium hydroxide as a microwave digestion solution To decompose the bauxite scheme, similarly, there will be the above-mentioned disadvantages of high-temperature melting samples. In addition to the inability to completely decompose the sample, the existence of a large amount of salt seriously interferes with the stability of the instrument, which is not conducive to the accurate determination of trace pits.

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