Method for determining content of tin in tin ore by alkali melting-inductively coupled plasma mass spectrometry

Abstract

The invention discloses a method for determining the content of tin in a tin ore by alkali melting-inductively coupled plasma mass spectrometry. The method comprises the steps: melting and decomposinga sample by sodium oxide, leaching by hot water, acidifying by hydrochloric acid, transferring the solution into a volumetric flask, and separately taking a clarifying liquid; diluting by nitric acid, allowing the sample to enter radio frequency plasma through a sample injection system, and carrying out evaporation, dissociation, atomization and ionization in a high temperature rectangular tube;separating ions by a double-cone interface, an ion mirror and a quadrupole mass analyzer according to the mass / charge size; and finally, detecting by an ion detector, quantitatively analyzing the content of tin by a calibration curve method, and thus quickly, accurately and effectively determining the content of tin in the tin ore. At the same time, the method improves the work efficiency, reducesthe labor intensity of operators, does not cause harm to bodies of the operators, and also has significant social benefits.

Description

technical field [0001] The invention relates to the technical field of chemical substance measurement and preparation, in particular to a method for measuring the amount of tin by alkali fusion-inductively coupled plasma mass spectrometry. Background technique [0002] Tin, a carbon group element, is a silver-white soft metal with a specific gravity of 7.3, an atomic number of 50, and an atomic weight of 118.71. The element name comes from Latin. The content of tin in the earth's crust is 0.004%, almost all in the form of cassiterite (tin oxide), in addition to a very small amount of tin sulfide ore. Tin is one of the famous "hardware" - gold, silver, copper, iron, and tin. There are abundant tin mines in my country, especially Gejiu City in Yunnan Province, which is the world-famous "Tin Capital". In addition, provinces such as Guangxi, Guangdong, and Jiangxi also produce tin. The natural reserve of tin in the earth's crust is 11 million tons, and the exploitable reserve ...

AI Technical Summary

Problems solved by technology

This method is a classic old chemical method, which is widely used in major domestic geological laboratories, but the disadvantage is that the analysis process is long and takes time for analysts. In addition, this method is an extraction and stripping process involving organic matter. The process will cause great harm to the health of analysts

Although the polarographic method still appears in books, with the emergence of large precision instruments, various laboratories no longer use this backward method to analyze the amount of tin

Emission spectroscopy is widely used in the analysis of regional geochemical exploration samples. Usually, only tin in geochemical exploration samples can be analyzed by this method. The upper limit of analysis is 200ug / g, and due to various reasons, the precision and stability are not ideal.

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