Digestion method and detection method of Tungsten-base class sample

Abstract

The invention discloses a digestion method of a Tungsten-base class sample, wherein the digestion method comprises the following steps: weighting and putting the tungsten-base class sample in a container, rinsing the wall of the container with a right amount of water; adding nitric acid and phosphoric acid, and then carrying out sample digestion and complex reaction by virtue of microwaves withinthe closed container; and after microwave processing is finished, cooling and diluting until an appropriate volume is achieved, thereby obtaining a sample solution used for detection. In addition, inductive coupling plasma atomic emission spectrum method and other detection methods are chosen to determine elements.

Description

technical field [0001] The invention relates to the field of detection and analysis of metal or alloy products such as tungsten carbide, metal tungsten, and cemented carbide, etc., with tungsten as the main matrix component. Simultaneously use the inorganic complexing agent phosphoric acid to complex tungsten, so that the tungsten matrix is ​​stably stored in the solution in the form of tungsten without tungstic acid precipitation. The method for preparing sample solutions such as tungsten carbide, metal tungsten or hard alloy, and A method for elemental detection of prepared sample solutions using analytical methods such as inductively coupled plasma atomic emission spectrometry (ICP-AES) Background technique [0002] Metal tungsten and its alloys are one of the most important functional materials in modern industry, national defense and high-tech applications. They are used in many fields such as aerospace, atomic energy, marine automobiles, electronics, petrochemicals, me...

AI Technical Summary

Problems solved by technology

This type of method obviously has many disadvantages: for example, the composition of the digestion system is complex, the matrix composition of the prepared sample solution is complex and the concentration of salts is too high, and the digestion of samples with alkaline reagents such as ammonia water and sodium peroxide is very unsuitable for ICP-AES, Determination requirements for detection instrument methods such as ICP-MS; in particular, organic complexing reagents such as ammonium citrate and tartaric acid used in large quantities are mostly used in traditional chemical analysis methods and are not suitable for instrumental analysis methods, such as serious carbides caused by ICP-AES Molecular spectral interference, causing undecomposed or deposited carbide particles to block the injection cone for ICP-MS, and carbide molecular scattering interference for AAS, etc., all affect the accuracy of the detection results

Therefore, the detection and applicability of this technique are limited

[0010] In short, the existing chemical analysis methods and instrumental analysis methods have not yet solved the technical problems of sample solution preparation and element detection in the digestion of tungsten carbide and metal tungsten samples and the use of complexation reactions to avoid tungsten-based precipitation.

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