GOST 12560.2-78
GOST 12560.2−78 Alloys palladium-silver-cobalt. Method of spectral analysis (with Change No. 1)
GOST 12560.2−78
Group B59
STATE STANDARD OF THE USSR
ALLOYS PALLADIUM-SILVER-COBALT
Method of spectral analysis
Palladium-silver-cobalt. 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. T. Levin, V. D. Ponomareva
Contractor 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 794
REPLACE GOST 12560−67 in part of sec. 4
The Change N 1, approved and put into effect by the Decree of the USSR State Committee for standards from
Change No. 1 made by the manufacturer of the database in the text IUS N 2, 1989
This standard establishes a spectral method for the determination of platinum, iridium, rhodium, iron, gold, bismuth and lead (with a mass fraction of platinum, iridium, rhodium, iron, and gold from 0.01 to 0.20% of bismuth and of lead from 0.001 to 0.04%) in a palladium-silver-cobalt alloys.
The method is based on converting the sample material into a globule (liquid drop of melt) and photographing its spectrum in the arc discharge. The relationship of the intensity of a spectral line with a mass fraction of impurities establish a calibration system using standard 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 spectrograph diffraction large dispersion grating of 600 or 1200 lines. mm.
Arc generator AC type IVS-28.
Three-step attenuator.
Geregistreerde microphotometer.
Analytical scale.
Electrodes, carbon, spectral-pure helium-2 or high purity-7−3 with a diameter of 6 mm.
Grinding machine carbon electrodes.
Photographic plates of the spectral type II, sensitivity of 10−15 units.
Standard samples of the enterprise.
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. To remove surface contamination, the sample is boiled in hydrochloric acid, diluted 1:1 for 2 minutes, washed with water and dried.
From each sample take at least three batches weighing 0.1−0.2 g.
The electrodes were applied to the spectral coals with a diameter of 6 mm. Bottom electrode in the form of glasses with a millimeter recess, in which is placed the sample. The counter serves as a carbon rod, sharpened to a hemisphere or a truncated cone with the area of 1.5−2 mm.
(Changed edition, Rev. N 1).
4. ANALYSIS
4.1. The spectra photographed with a width of 0.025 mm spectrograph on a photographic plate of the type II through a three-stage attenuator, exposure 40−60 C and a current of 8 A.
Lighting the cracks are being carried out through the condenser with the diaphragm at an average lens height of 5 mm. Adjustment of the interelectrode gap is produced continuously throughout the exposure on the magnified image of the arc on the screen of the intermediate diaphragm.
With the samples on the same plate photographed spectra of standard samples analyzed grade alloy. For each sample and the standard sample get 2−3 parallel spectrogram.
Manifestation and fixation of photographic plates — according to GOST 10691.0−84.
(Changed edition, Rev. N 1).
5. PROCESSING OF THE RESULTS
5.1. Wavelength of analytical spectral lines are given in table.1.
Table 1
| The designated element | The wavelength of the element, nm |
The wavelength of the element comparisons, nm |
| Platinum | 299,80 | Background in the long wavelength side |
| Rhodium | 332,31 | The same |
| Iridium | 313,33 | Background the short wavelength side |
| Gold | 312,28 | Background in the long wavelength side |
| Lead | 283,31 | The same |
| Bismuth | 306,77 | « |
| Iron | 283,24 | Cobalt — 283,39 |
Mass fraction of impurities was determined by the three standards with the objective photoretrieval. Build calibration graphs for each of the element. Y-axis delay value difference pucherani line impurity and background, and the abscissa shows the values of the logarithm of mass fractions of standard 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 probability of 0.95 should not exceed the values given in table.2.
Table 2
| Interval mass fraction, % |
Permissible relative discrepancy, % |
| From 0.001 to 0.03 |
15 |
| SV. Of 0.03 «to 0.20 |
10 |
5.1, 5.2. (Changed edition, Rev. N 1).
