GOST 22519.7-77
GOST 22519.7−77 Thallium. Method for the determination of tin (with Amendments No. 1, 2, 3)
GOST 22519.7−77
Group B59
STATE STANDARD OF THE USSR
THALLIUM
Method for determination of tin
THALLIUM. Method for the determination of tin
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 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 860−75 |
2 |
GOST 3118−77 |
2 |
GOST 3760−79 |
2 |
GOST 4204−77 |
2 |
GOST 4233−77 |
2 |
GOST 4461−77 |
2 |
GOST 4658−73 |
2 |
GOST 5456−79 |
2 |
GOST 10652−73 |
2 |
GOST 10929−76 |
2 |
GOST 18337−80 |
Chapeau |
GOST 22159−76 |
2 |
GOST 22519.0−77 |
1.1 |
GOST 23932−90 |
2 |
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 sets the polarographic method for the determination of tin (with mass fraction of tin 0.00005 to 0.0001%) in thallium brands Tl000, Tl00 and TL0 GOST 18337*.
______________
* On the territory of the Russian Federation GOST 18337−95. — Note the manufacturer’s database.
The method is based on preliminary separation of tin in the hydroxide of beryllium from the nitric acid solution in the presence of Trilon B and polarographic determination of background containing a sodium chloride solution of 1.72 mol/DMsolution of hydrochloric acid 3 mol/DMat a potential of minus 0,52 versus the saturated calomel electrode.
(Changed edition, Rev. N 2, 3).
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
Polarograph polarograph oscilloscope or AC of any type.
Funnel glass filter No. 2, type VF with a diameter of 28−30 mm according to GOST 23932.
Nitric acid according to GOST 4461, diluted 1:1.
Hydrochloric acid according to GOST 3118.
Sulfuric acid according to GOST 4204, diluted 1:1.
Ascorbic acid.
Ammonia water according to GOST 3760.
Hydrogen peroxide according to GOST 10929.
Cetarehwodie beryllium nitrate, solution 50 g/DMor beryllium sulfate cetarehwodie, a solution of 40 g/DM.
The content of beryllium in 1 cmis 10 mg.
Hydrazine dihydrochloride according to GOST 22159 or hydroxylamine hydrochloride according to GOST 5456.
Iron nitrate, a solution of 70 g/DM.
Sodium chloride according to GOST 4233.
Tin GOST 860, brand 01.
A standard solution of tin; prepared as follows: 0,100 g ostertag powder tin is placed in a conical flask with a capacity of 250 cm, flow 10 cmof sulphuric acid and heated until complete dissolution of the sample, not leading to selection of sulphuric anhydride. Cooled, poured 100 cmchloride solution, quantitatively transferred to a volumetric flask with a capacity of 1 DM, dilute to the mark with chloride solution and stirred.
1 cmstandard solution contains 0.1 mg of tin.
Calibration solutions of tin; prepared as follows: in seven volumetric flasks with a capacity of up to 200 cmmeasure accordingly 0; 0,2; 0,4; 0,6; 0,8; 1,0 and 2.0 cmof a standard solution of tin, diluted to the mark and the background electrolyte and stirred. The calibration solutions contain respectively 0; 0,1; 0,2; 0,3; 0,4; 0,5 and 1 mg/ltin.
The washing liquid; is prepared as follows: into a flask with a capacity of 1 DMput 10 cmof ammonia, 200 cmof water, 2 g of Trilon B, diluted to the specified volume and stirred.
Disodium salt of Ethylenediamine-N, N, N', N'- tetraoxane acid (Trilon B) according to GOST 10652.
Background electrolyte; prepared as follows: into a flask with a capacity of 1 DMwas placed 100 g of sodium chloride, 10 g of hydrazine dihydrochloride (hydroxylamine hydrochloride), 335 cmof hydrochloric acid, diluted to the specified volume with water and mix.
Chloride solution; prepared as follows: into a flask with a capacity of 1 DMwas placed 100 g of sodium chloride, 335 cmof hydrochloric acid, diluted to the specified volume with water and mix.
Mercury GOST 4658.
(Changed edition, Rev. N 3).
3. ANALYSIS
3.1. In a conical flask with a capacity of 100 cmis placed a portion of the thallium weight of 5,000 g, poured 20 cmof nitric acid, diluted 1:1, heated to dissolution, poured 50 cmwater, 1 cmof solution of nitrate of iron, heated to 80−90 °C, poured ammonia until the full allocation of hydroxides of iron and tin in excess of 3 cm. The precipitate is coagulated in a warm place for 15−20 minutes, then filter it into a glass filter (no vacuum), washed four times with hot water. The filtrate and the washings discarded.
The filter cake is dissolved in 30 cmhot hydrochloric acid, diluted 1:3, with the addition of 6−8 drops of hydrogen peroxide, and then the filter is washed with 20 cmof water. The solution and washings collected in the flask in which to carry out the precipitation of the hydroxides of iron and tin. Pour 2 cmof a solution of beryllium nitrate, and the solution neutralized with ammonia to a faint smell, add about 1 g of Trilon B, mix, add 2 cmof ammonia in excess, the coagulated precipitate of the hydroxide of beryllium and tin at a temperature of 35−40 °C for 15−20 min. the Precipitate was filtered off on a glass filter (no vacuum), washed 3−4 times with washing liquid, not Usacheva sediment, and twice with warm water. The liquid from the filter should flow (in the nose cone should not be liquid). The filtrate and the washings discarded.
The filter cake is dissolved in 5 or 10 cm,background electrolyte, pre-wash to the walls of the bulb, which conducted the deposition. The solution is collected in a clean, dry beaker with a capacity of 50 cm.
To the solution add about 10 mg of ascorbic acid, stirred and poured into the electrolyser and conduct polarographically in the field of polarization dripping mercuric electrode from minus 0.4 to minus 0.7 V relative to a saturated calomel or mercury electrodes in comparison with the use of oscilloscope or alternating-current data handling. Similarly polarografic the calibration solutions and the control solution experience.
The value of the wave height of solution in the reference experiment is subtracted from the wave height of sample solution.
(Changed edition, Rev. N 3).
4. PROCESSING OF THE RESULTS
4.1. Mass fraction of tin in percent is calculated by the formula
,
where wave height tin when polarography of the sample solution, mm;
— the volume of the sample solution, cm;
— the value of the ratio of the wave height tin the calibration solution to its mass concentration, mm·DM/mg;
the weight of thallium,
4.2. The absolute values of the differences between the results of two parallel measurements (rate of convergence) with confidence probability of 0.95 does not exceed 0,00003%, and the results of the two tests (index of reproducibility), 0.00004 percent.
4.1, 4.2. (Changed edition, Rev. N 3).