GOST 12553.2-77
GOST 12553.2−77 Alloys of platinum-palladium. Method of spectral analysis (with Change No. 1)
GOST 12553.2−77
Group B59
STATE STANDARD OF THE USSR
ALLOYS, PLATINUM-PALLADIUM
Method of spectral analysis
Platinum-palladium alloys. Method of spectral of analysis
AXTU 1709*
______________
* Introduced advanced Edit. N 1.
Valid from 01.01.1979
to 01.01.1984*
_________________________________
* 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
Director S. G. Gushchin
Heads V. G. Levin, V. D. Ponomareva
Performers: M. P. Yufa, A. I. Osintseva, R. M. Bogdanova
INTRODUCED by the Ministry of nonferrous metallurgy of the USSR
Zam. Minister V. S. Ustinov
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 the USSR Council of Ministers dated 27 December 1977, N 3070
REPLACE GOST 12553−67 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 8, 1988
This standard establishes a spectral method for the determination of rhodium, iridium, gold and iron (in mass fraction from 0.01 to 0.20% each).
The method is based on measuring the intensity of impurity lines in an arc spectrum. Quantification of mass fraction of impurities is set by calibration with the test samples. As one of the electrodes apply a piece of analyzed alloy. The second electrode of the coal.
(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 a digit of the same rank as that of the normalized indicator grade composition.
(Added, Rev. N 1).
2. APPARATUS, REAGENTS AND SOLUTIONS
Quartz spectrograph medium dispersion.
The generator is activated the arc AC.
Microphotometer.
Electrodes, carbon, spectral-pure helium-2 or high purity-3 6 mm in diameter, sharpened to a hemisphere or a truncated cone with ground diameter of 1.5−2 mm.
Grinding machine carbon electrodes.
Photographic plates of the spectral type II sensitivity of 10−15 conventional units.
Three-step attenuator.
The control samples.
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 a piece of arbitrary shape weighing 40−50 g with the area of 300−400 mm. Pad clean up with a file.
3.2. 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.
4. ANALYSIS
Photographing spectra is produced when the width of the slit of a spectrograph 0.015 mm, the distance between the electrodes is 1.5 mm, the strength of the arc current is 5 A, the exposure time 30 s. the Gap in the arrester is mounted in such a way that in each half-cycle of current in the arrestor took one or two digits.
The spectra are photographed through a three-stage attenuator for spectral photographic plates of type II. Along with the study samples on the same plate photographed spectra of the control samples. For each sample and a control sample get 2−3 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. Wavelength of analytical spectral lines 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 |
| Rhodium | 339,68 | Platinum | 334,39 |
| Iridium | 332,07 | The same | 334,39 |
| Gold | 267,59 | « | 264,54 |
| Iron | 259,96 | « | 264,54 |
Mass 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 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.
(Changed edition, Rev. N 1).
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
| Mass fraction, % | Permissible relative discrepancy, % |
| From 0.01 to 0.05 | 15 |
| SV. Of 0.05 «to 0.20 | 10 |
