Method for using ICP-AES to accurately measure precious metal content in solution

Abstract

The invention discloses a method for using ICP-AES to accurately measure precious metal content in a solution. The method comprises the first step of preparing a precious metal single element standard stocking solution; the second step of preparing an indium internal standard stocking solution; the third step of preparing a precious metal standard working solution, wherein the precious metal standard can be a precious metal single element standard or a standard of mixing of several kinds of precious metal elements); the fourth step of preparing a precious metal sample testing solution; the fifth step of conducting measuring, wherein a proper inductive coupling plasma emission spectrometer (ICP-AES) is selected to test conditions (including setting of an internal standard mode), and a series of solutions like the precious metal standard working solution are measured to draw a working curve, the linearity of the working curve is made larger than or equal to 0.99995, and a sample testing solution B is measured under an equal condition. An instrument automatically searches for the precious metal content value ws in the given sample testing solution B, and the unit is mg / g. The precious metal content Omega p of a precious metal sample is obtained according to fixed weight dilution folds, wherein the formula of Omega p is (ws*m30*100*m27) * 100 / (m28*m25), the unit is %, and the precious metal is Au, Pt, Pd, Rh, Ir, and Ru.

Description

technical field [0001] The invention relates to the field of noble metal analytical chemistry, in particular to a method for accurately measuring the noble metal content in complex high-concentration system noble metal solids or solutions by using ICP-AES. Precious metal solid or solution samples in complex high-concentration systems mainly come from high-content precious metal wastes formed during the use of various precious metal products, intermediate materials and solutions formed in metallurgical recycling processes, etc. Background technique [0002] Due to the special physical and chemical properties of precious metals, such as excellent electrical conductivity, catalytic performance, super corrosion resistance and beautiful color, etc., they have been widely used in the electronics industry, petrochemical industry, environmental protection, aerospace and jewelry industries. Applications. Precious metals are expensive due to their relatively small content on the eart...

AI Technical Summary

Problems solved by technology

In addition, there are factors such as the influence of solution viscosity during volume fractionation and the influence of volume constant by ambient temperature changes in the traditional method of using volume dilution internal standard to control detection accuracy.

Therefore, we have improved the above problems and proposed a method for the accurate determination of precious metal content in complex and high-concentration precious metal solid or solution samples by ICP-AES, which can make the relative standard deviation of precious metal determination reach about 1%, which is close to the traditional capacity method and gravimetric method, can be a good replacement for volumetric and gravimetric methods that cannot be used or have poor accuracy due to interference

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