GOST 12561.2-78

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  ГОСТ 12561.2-78

GOST 12561.2−78 Alloys palladium-silver-copper. Method of spectral analysis (with Change No. 1)

GOST 12561.2−78

Group B59

STATE STANDARD OF THE USSR

ALLOYS PALLADIUM-SILVER-COPPER

Method of spectral analysis

Palladium-silver-copper alloys. Method of spectral analysis

AXTU 1709*
______________
* Introduced advanced Edit. N 1.

Valid from 01.07.1979
prior to 01.07.1984*
_______________________________
* Expiration removed by Protocol No. 3−93
The interstate Council for standardization,
Metrology and certification (ICS No. 5/6, 1993). -
Note the manufacturer’s database.

DEVELOPED by Sverdlovsk factory on processing of nonferrous metals

GL. engineer A. A. Kuranov

Heads: G. S. Haak, V. G. Levin, V. D. Ponomareva

Performers: S. M. Pies, R. M. Bogdanova

INTRODUCED by the Ministry of nonferrous metallurgy of the USSR

Member Of The Board Of A. P. Snurnikov

The draft all-Union scientific research Institute of standardization (VNIIS)

Director A. V. Gichev

APPROVED AND promulgated by the Decree of the State Committee of standards of Ministerial Council of the USSR of March 24, 1978 N 795

REPLACE GOST 12561−67 in part of sec. 5

The Change N 1, approved and put into effect by the Decree of the USSR State Committee for standards from 24.11.88 N 3815 from 01.07.89

Change No. 1 made by the manufacturer of the database in the text IUS N 2, 1990


This standard establishes a spectral method for the determination of platinum, rhodium, iridium, gold, iron, bismuth, and lead (with a mass fraction of platinum, rhodium and iridium from 0.01 to 0.20%, gold and iron from 0.005 to 0.10%, of bismuth and lead from 0.001 to 0.02%) in a palladium-silver-copper alloys.

The method is based on measuring the intensity of impurity lines in an arc spectrum. Quantification of the mass fraction of impurities is set by calibration with the test samples.

(Changed edition, Rev. N 1).

1. GENERAL REQUIREMENTS

1.1. General requirements for method of analysis according to GOST 22864−83.

(Changed edition, Rev. N 1).

1.2. The numerical value of the result of the analysis must end with the digit the same category, and permissible differences.

(Added, Rev. N 1).

2. APPARATUS, REAGENTS AND SOLUTIONS

The quartz spectrograph medium dispersion type of ISP-30.

Arc generator AC type IVS-28.

Microphotometer geregistreerde.

Standard samples of the enterprise.

Clips (electrode holders) with forced cooling.

Photographic plates of the spectral type II sensitivity of 10−15 units.

The N developer 1 and fixer.

Hydrochloric acid by the GOST 3118−77, diluted 1:1.

(Changed edition, Rev. N 1).

3. PREPARATION FOR ASSAY

3.1. Samples and control samples must be in the form of two cast rods with a diameter of 6 mm and a length of 25−30 mm, is ground to a hemisphere.

To remove surface contamination, the samples are placed in the cups, pour hydrochloric acid diluted 1:1, boiled for 2 min, rinsed and dried.

4. ANALYSIS

4.1. Photographing spectra is produced when the width of the slit of a spectrograph 0.01 mm, the distance between the electrodes is 1 mm, the strength of the arc current is 5 A, the time of the preliminary firing 20, exposure time 30 s.

The spectra are photographed on photographic plates of the spectral type II. Along with the study samples on the same plate photographed spectra of the control samples.

For each sample and control sample to receive three parallel spectrogram.

Photographic plates showing within 3 min when the temperature of the developer is 18−20 °C. the Shown plate is rinsed in water, fixed, washed thoroughly in running water for 10 min, dried and photometric.

5. PROCESSING OF THE RESULTS

5.1. The wavelengths of the analytical lines given in table.1.

Table 1

Mass fraction of impurities determined by the method of «three standards» with the objective photoretrieval. The calibration graphs are built for each analyzed element. On the y-axis delay value difference pucherani lines of impurities and the main substances, and on the x — axis is the value of the logarithm of the mass fraction of control samples.

With the help of calibration curve by the known values of the difference of pochernenija find the mass fraction of impurities in the sample.

5.2. Permissible relative discrepancy between the results of parallel measurements at a confidence level =0.95 does not exceed the values specified in table.2.

Table 2

5.1, 5.2. (Changed edition, Rev. N 1).