GOST 12558.2-78
GOST 12558.2−78 Alloys palladium-silver. Method of spectral analysis (with Change No. 1)
GOST 12558.2−78
Group B59
STATE STANDARD OF THE USSR
ALLOYS PALLADIUM-SILVER
Method of spectral analysis
Palladium-silver alloys. Method of spectral of analysis
AXTU 1709*
______________
* Introduced advanced Edit. N 1.
Valid from 01.07.79
before 01.07.84*
_________________________________
* Expiration removed
Protocol N 3−93 Interstate
Council for standardization, Metrology and certification
(IUS No. 5/6, 1993). — Note
manufacturer 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 793
REPLACE GOST 12558−67 in part of sec. 3
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, rhodium, iridium, gold, iron, bismuth, and lead (with a mass fraction of platinum, rhodium and iridium from 0.01 to 0.20%, iron and gold from 0.005 to 0.10%, of bismuth and lead from 0.001 to 0.02%) in palladium-silver 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. As electrodes used cast rods of palladium-silver alloy.
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.
Generator activated arc type AC DG-2 or IVS-28.
Microphotometer geregistreerde.
Standard samples of the enterprise.
Clips (electrode holders) with forced water cooling.
Photographic plates of spectral types I and II.
The developer and fixer.
Hydrochloric acid by the GOST 3118−77, diluted 1:1.
(Changed edition, Rev. N 1).
3. PREPARATION FOR ASSAY
Samples and standard samples should be in water two cast iron 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 diluted 1:1 hydrochloric acid, boil for 2 min, washed with water and dried.
(Changed edition, Rev. N 1).
4. ANALYSIS
Photographing the spectra was carried out at a slit width of 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 I or type II. Along with the study samples on the same plate photographed spectra of standard samples. 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 and ranges of detectable concentrations of the impurities are given in table.1.
Table 1
| The designated element | Wavelength of lines of the designated element, nm | Element comparison | The wavelength of the line item comparisons, nm | The interval defined by concentration, % |
| Rhodium | 332,31 | Palladium |
332,10 | 0,01−0,20 |
| Iridium | 266,48 | Background or palladium |
268,63 | 0,01−0,20 |
| Platinum | 270,24 | Palladium |
268,63 | 0,01−0,20 |
| Gold | 267,59 | The same |
268,63 | 0,005−0,10 |
| Iron | 259,94 | « |
268,63 | 0,005−0,10 |
| Bismuth | 306,77 | Background |
- | 0,001−0,02 |
| Lead | 283,31 | The same |
- | 0,001−0,02 |
Massovaya fraction of impurities determined by the method of «three standards» with the objective photoretrieval. The calibration graphs are built for each analyzed element.
Y-axis delay value difference pucherani lines of impurities and the main substances, and the horizontal axis — the values 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 content 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
| The interval of concentrations, % | Permissible relative discrepancy, % |
| From 0.001 to 0.03 | 15 |
| SV. Of 0.03 «to 0.20 | 10 |
