GOST 22519.2-77
GOST 22519.2−77 Thallium. Method for the determination of Nickel (with Amendments No. 1, 2, 3)
GOST 22519.2−77
Group B59
STATE STANDARD OF THE USSR
THALLIUM
Method for the determination of Nickel
THALLIUM. Method for the determination of nickel
AXTU 1709
Date of introduction 1978−01−01
INFORMATION DATA
1. DEVELOPED AND INTRODUCED by the Ministry of nonferrous metallurgy of the USSR
DEVELOPERS
A. P. Sychev, M. G. Sun, V. I. Lysenko, I. A. 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 (Protocol No. 4 dated 21.10.93)
The adoption voted:
The name of the state |
The name of the national authority for standardization |
The Republic Of Armenia |
Armastajad |
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 |
The Republic Of Turkmenistan |
The main state inspection of Turkmenistan |
The Republic Of Uzbekistan |
Standards |
Ukraine |
Gosstandart Of Ukraine |
3. INTRODUCED FOR THE FIRST TIME
4. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS
The designation of the reference document referenced |
The number of the paragraph, subparagraph |
GOST 849−70 |
2 |
GOST 3118−77 |
2 |
GOST 3652−69 |
2 |
GOST 4109−79 |
2 |
GOST 4204−77 |
2 |
GOST 4328−77 |
2 |
GOST 4461−77 |
2 |
GOST 5828−77 |
2 |
GOST 10929−76 |
2 |
GOST 18300−87 |
2 |
GOST 18337−80 |
Chapeau |
GOST 20478−75 |
2 |
GOST 22519.0−77 |
1.1 |
5. Limitation of actions taken on the Protocol, the Interstate Council for standardization, Metrology and certification (ICS 2−93)
6. REPRINT (February 1998) with Amendments No. 1, 2, 3, approved in January 1983, March 1987-June 1996 (IUS 5−83, 6−87, 9−96)
This standard establishes photocolorimetric method for the determination of Nickel (at a mass fraction of Nickel from 0,00002 to 0,0005%) in thallium brands TL0 GOST 18337*.
______________
* On the territory of the Russian Federation GOST 18337−95. — Note the manufacturer’s database.
Photocolorimetric determination of Nickel based on the color reaction of Nickel ions with dimethylglyoxime in an alkaline medium in the presence of an oxidant. The bulk of the thallium pre-separated by extraction with ether from a hydrochloric acid solution 6 mol/DM.
The sensitivity of the method was 1 µg in a volume of 25 cm.
(Changed edition, Rev. N 2).
1. GENERAL REQUIREMENTS
1.1. General requirements for method of analysis and security requirements — according to GOST 22519.0.
(Changed edition, Rev. N 3).
2. APPARATUS, REAGENTS AND SOLUTIONS
Photoelectrocolorimeter.
Nitric acid according to GOST 4461, diluted 1:1.
Hydrochloric acid according to GOST 3118, diluted 1:1.
Sulfuric acid according to GOST 4204, diluted 1:1.
Citric acid according to GOST 3652, a solution of 20 g/DM.
Ammonium neccersarily according to GOST 20478, a solution of 30 g/DM.
Bromine according to GOST 4109.
Dimethylglyoxime according to GOST 5828, alcoholic solution of 10 g/DM.
Sodium hydroxide according to GOST 4328, a solution of 200 g/DM.
Nickel GOST 849*, mark H0.
______________
* On the territory of the Russian Federation GOST 849−97. — Note the manufacturer’s database.
Standard solutions of Nickel.
Solution A, prepared as follows: 0,100 g of metallic Nickel dissolved in 10 cmof nitric acid, diluted 1:1, boil to remove oxides of nitrogen, cooled, transferred to a volumetric flask with a capacity of 1 DM, dilute to the mark with water and mix.
1 cmof solution A contains 0.1 mg of Nickel.
Solution B is prepared as follows: 2 cmof solution A is placed in a volumetric flask with a capacity of 100 cm, is diluted to the mark with water and mix.
1 cmof solution contains 2 mcg of Nickel.
Rectified ethyl alcohol according to GOST 18300.
Diethyl ether (medical).
Hydrogen peroxide according to GOST 10929.
(Changed edition, Rev. N 1, 2, 3).
3. ANALYSIS
3.1. A portion of the thallium weighing 1,000 g (with mass fraction of thallium 99,98−99,99%) or 5,000 g (with mass fraction of thallium 99,999-of 99.9995%) was placed in a flask with a capacity of 100 cmand dissolved, respectively, in 4 and 8 cmof nitric acid, diluted 1:1, pour 10−20 cmof hydrochloric acid diluted 1:1, 0.5−2 cmof bromine and slightly heated until complete dissolution of the precipitate of chloride of thallium.
The solution was transferred to a separatory funnel with a capacity of 100−150 cm, the walls of the flask are washed with 5 cmof hydrochloric acid diluted 1:1, flow 30 cmof ethyl ether, and shake the funnel for 1 min. After phase separation, hydrochloric acid solution was transferred to another separating funnel, add 1−3 drops of bromine, 30 cmof ether and the extraction of thallium repeat as above. Hydrochloric acid solution is poured into a glass with a capacity of 50 cm, add 0.5 cmof sulphuric acid diluted 1:1, evaporated to fumes of sulphuric anhydride, add a few drops of hydrogen peroxide (oxidation of organic compounds), cooled, washed the side of the Cup 1−2 cmof water and again evaporated to fumes of sulfuric acid.
After cooling, to the residue poured 1 cmof solution of citric acid, neutralized with sodium hydroxide solution to pH 7 (universal indicator paper) and pour 1 cmin excess, then pour 2.5 cmof the solution naternicola ammonium, 2.5 cmdimethylglyoxime alcohol solution and stirred. Colored solution of dimethylglyoximato Nickel quantitatively transferred to a volumetric flask with a capacity of 25 cm, is diluted to the mark with water and mix.
Optical density of the solution is measured on a photoelectrocolorimeter, applying the filter to the light transmission around 450 nm in a cuvette with the thickness of the light absorbing layer 50 mm Solution of comparison is water.
The amount of Nickel in kalorimetricheskim the solution set for the calibration
have graphics.
3.2. Construction of calibration curve
In seven volumetric flasks with a capacity of 25 cmmeasure 0; 0,5; 1,0; 2,0; 3,0; 4,0 and 5.0 cmstandard solution B (equivalent to 0; 1; 2; 4; 6; 8 and 10 mcg of Nickel), was diluted to a volume of 10 cmof water, poured 1 cmof solution of citric acid, neutralized with sodium hydroxide solution to pH 7 (universal indicator paper) and pour 1 cmin excess. Further analysis are as indicated in claim 3.1.
On the found values of optical densities and their corresponding grades of Nickel to build a calibration curve.
3.1, 3.2. (Changed edition, Rev. N 2, 3).
4. PROCESSING OF THE RESULTS
4.1. Mass fraction of Nickel () in percent is calculated by the formula
,
where is the mass of Nickel,
the weight of thallium,
(Changed edition, Rev. N 2).
4.2. The absolute values of the differences between the results of two parallel measurements (rate of convergence) and the results of the two tests (index of reproducibility) with confidence probability of 0.95 should not exceed the values permitted discrepancies listed in the table.
Mass fraction of Nickel, % |
The permissible difference for parallel definitions % |
The permissible discrepancy between the results of the analysis % | |||||
From | 0,00002 | to | 0,00005 | incl. | 0,00001 |
0,00001 | |
SV. | 0,00005 | « | 0,00010 | « | 0,00003 |
0,00005 | |
« | 0,00010 | « | 0,00020 | « | 0,00005 |
0,00007 | |
« | 0,00020 | « | 0,00050 | « | 0,00008 |
0,00012 |
(Changed edition, Rev. N 3).