GOST 12645.3-77
GOST 12645.3−77 indium. Spectral method for determination of cadmium (with Amendments No. 1, 2, 3)
GOST 12645.3−77
Group B59
STATE STANDARD OF THE USSR
INDIUM
Spectral method for determination of cadmium
Indium. Spectral method for determination of cadmium
AXTU 1709
Date of introduction 1978−07−01
INFORMATION DATA
1. DEVELOPED AND INTRODUCED by the Ministry of nonferrous metallurgy of the USSR
DEVELOPERS
A. P. Sychev, L. K. Larina (theme leader); M. G. Saun (supervisor); V. N. Makarceva, N. With. References: E. V. Lisitsyn, N. Romanenko, V. A. Kolesnikov
2. APPROVED AND promulgated by the Decree of the State Committee of standards of Ministerial Council of the USSR from
Change No. 3 adopted by the Interstate Council for standardization, Metrology and certification
The adoption voted:
| The name of the state |
The name of the national authority for standardization |
| The Republic Of Azerbaijan |
Azgosstandart |
| The Republic Of Belarus |
Gosstandart Of Belarus |
| The Republic Of Kazakhstan |
Gosstandart Of The Republic Of Kazakhstan |
| The Republic Of Moldova |
Moldovastandart |
| Russian Federation |
Gosstandart Of Russia |
| Turkmenistan |
The main state inspection of Turkmenistan |
| The Republic Of Uzbekistan |
Standards |
| Ukraine |
Gosstandart Of Ukraine |
3. REPLACE GOST 12645−67
4. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS
| The designation of the reference document referenced |
The number of the paragraph, subparagraph, section |
| GOST 8.315−91 |
Sec. 2 |
| GOST 12645.0−83 |
1.1 |
| GOST 22306−77 |
1.1 |
5. Limitation of actions taken by Protocol No. 3−93 Interstate Council for standardization, Metrology and certification (ICS 5−6-93)
6. REPRINT (January 1998) with Amendments No. 1, 2, 3, approved in February 1983, December 1987-June 1996 (IUS 5−83, 3−88, 9−96)
This standard establishes a spectral method for the determination of cadmium in India, when the mass fraction of cadmium from 1·10to 8−10
%.
It is based on the method of «three standards» with the evaporation of cadmium from the crater of the carbon electrode in the arc DC.
(Changed edition, Rev. N 2).
1. GENERAL REQUIREMENTS
1.1. General requirements for method of analysis and security requirements — according to GOST and GOST 12645.0 22306.
(Changed edition, Rev. N 2).
2. APPARATUS, REAGENTS AND MATERIALS
The quartz spectrograph medium dispersion of any type with being an illumination system of the slit.
Arc generator of alternating current.
A constant current source providing a voltage of at least 200 V and a current not less than 20 A.
Microphotometer designed to measure pucherani spectral lines.
Libra torsion bar type W with a weighing error of no more than 0.001 g.
Analytical scale with a weighing error of no more than 0,0002 g.
Electrodes, carbon, 6 mm in diameter with a crater size 4x10 mm.
Photographic plates of the spectral spectrographic types SFC-03, PFS-04 or NT-2 SV.
Standard samples to construct calibration curve developed in accordance with GOST 8.315*.
______________
* On the territory of the Russian Federation GOST 8.315−97. — Note the manufacturer’s database.
Note. Allowed the use of devices with photovoltaic spectra and other spectral instruments, other reagents and materials, providing the accuracy that rivals regulated in this standard.
(Changed edition, Rev. N 2, 3).
3. ANALYSIS
Determination of cadmium is carried out on the quartz spectrograph medium dispersion being a condenser. The slot width of 0.015 mm. the Weight of the portion of the sample or standard sample (100 mg) in the form of metal pieces placed in the hole of the lower carbon electrode with a depth of 10 mm and a diameter of 4 mm and thoroughly compacted with a kick ball made of organic glass. The upper electrode is coal, sharpened to a truncated cone with the diameter of the pad is 2 mm. Between the electrodes ignites the arc DC power of 15 A. the exposure Time is 2 min. Distance between electrodes of 2.5−3.0 mm should remain constant throughout the exposure.
Spectra of the samples photographed for six samples comparison — three times on a single photographic plate.
(Changed edition, Rev. N 3).
4. PROCESSING OF THE RESULTS
4.1. In the spectrogram, using microphotometry measure the blackening of analytical lines of cadmium Cd I 228.8 m and the nearby background (right of the line). The calibration graphs are built in coordinates 
a — line;
— background);
— mass fraction of cadmium in the samples comparison.
For the calibration chart find mass fraction of cadmium in the sample in percent.
For the results analysis be the arithmetic mean of results of two parallel measurements obtained on a single photographic plate, each of the three spectrograms.
The difference between the smaller and larger of the two results of parallel measurements with a confidence probability of 0.95 does not exceed the value of permissible differences
calculated by the formula
where — the average of the two mapped results of parallel measurements.
The difference between the smaller and larger of the two results of the analysis of the same samples with a confidence level of 0.95 does not exceed the value of permissible differences
calculated by the formula
where — the average of the two matched analyses.
(Changed edition, Rev. N 1, 2, 3).
4.2. (Deleted, Rev. N 1).
