SU515950A1 - Mixture for the spectral determination of tungsten in tantalum - Google Patents

Description

one

This invention relates to the field of spectral analysis.

Several mixtures are known for the spectral determination of tungsten in tantalum and some other products.

The most common is a mixture consisting of a buffer mixture based on silver chloride and a sample oxidized to tioxane tantalum in a ratio of 1: 3 weight. h

When using such a mixture, the sensitivity of the determination of tungsten in tantalum is insufficient (.), Which does not allow controlling the production of tantalum at a higher frequency.

The aim of the invention is to create a mixture that makes it possible to increase the sensitivity of the determination of tungsten in tantalum by enhancing the blackening of the tungsten line, which in turn will make it possible to control the production of high-purity tantalum.

For this purpose, a phosphorus-containing compound is injected into the mixture, preferably having up to 0.1-0.6 wt. % phosphorus in the sample, for example, by mixing in a ratio of 3: 1 weight. including a sample oxidized to tantalum pentoxide with a buffer mixture consisting of silver chloride and ammonium phosphate.

The use of the mixture makes it possible to increase the detection sensitivity to 2 ..

on samples of tantalum;

samples are presented in

Table 1

In tab. Table 2 shows the comparative data on the results of chemical and spectral methods for the determination of tungsten in tantalum powder (relatively “dirty samples”).

The obtained results show good reproducibility; the accuracy of determination of tungsten with the mixture under consideration is 15–18%.

Claims (2)

The analysis is carried out by mixing a sample oxidized to tantalum peroxide in a ratio of 3: 1 weight. with a buffer mixture consisting of silver chloride and ammonium phosphate. Pavescu Table 2 (30 mg) of the sample, mixed with the buffer mixture, is loaded into a “glass electrode, excites the spectrum in an alternating current arc of 16-18 a; exposure time 25 sec. The spectrum of fik10 15 20 is sorted onto a photographic plate using a diffraction spectrograph, for example, DFS-13. As an analytical line using tW-4008, 8A. The results are found according to the calibration graph, which is constructed according to the well-known method of the three standards. Claim 1. A mixture for the spectral determination of tungsten in tantalum, containing a sample oxidized to tantalum pentoxide and a buffer mixture based on silver chloride in a ratio of 3: 1 weight. h., characterized in that, in order to increase the sensitivity of the determination of tungsten, a phosphorus-containing compound is introduced into it, preferably having up to 0.1-0.6 wt. % phosphorus in the sample. 2. A mixture of l. 1, characterized in that ammonium phosphate is used as the phosphorus-containing product.