GOST 1293.10-83
GOST 1293.10−83 lead-antimony Alloys. Method for the determination of tin (with Amendments No. 1, 2)
GOST 1293.10−83*
______________________
* The designation of the standard.
Changed the wording, Rev. N 2.
Group B59
STATE STANDARD OF THE USSR
LEAD-ANTIMONY ALLOYS
Method for determination of tin
Lead-antimony alloys. Method for the determination of tin
AXTU 1709*
________________
* Changed the wording, Rev. N 1.
Valid from 01.07.83
prior to 01.07.88*
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* Expiration removed by Protocol No. 7−95
The interstate Council for standardization,
Metrology and certification (I & C N 11, 1995). -
Note the manufacturer’s database.
DEVELOPED by the Ministry of nonferrous metallurgy of the USSR
PERFORMERS
A. P. Sychev, M. G. Sun, L. I. Maksay, R. D. Kogan
INTRODUCED by the Ministry of nonferrous metallurgy of the USSR
Member Of The Board Of A. P. Snurnikov
APPROVED AND put INTO EFFECT by Decision of the USSR State Committee on standards of February 8, 1983 N 704
REPLACE GOST 1293.10−74
MADE: the Change in N 1, approved and put into effect by the Decree of the USSR State Committee for standards from
Change N 1, 2 made by the manufacturer of the database in the text IUS N 2, 1988, ICS # 7, 2001
This standard sets the photometric method for the determination of tin at a mass fraction of tin from 0.001 to 0.6% of lead-antimony alloys.
The method is based on extraction with chloroform in the environment of nitrate complex compounds of tetravalent tin with coppernob and subsequent measurement of optical density of yellow phenylfluorone complex at a wavelength of 510 nm on the spectrophotometer or in a region of wavelength 510−530 nm on a photoelectrocolorimeter.
(Changed edition, Rev. N 1, 2).
1. GENERAL REQUIREMENTS
1.1. General requirements for method of analysis according to GOST 1293.0−83.
2. APPARATUS, REAGENTS AND SOLUTIONS
Photoelectrocolorimeter or spectrophotometer.
Nitric acid GOST 4461−77 diluted 1:1 and solutions of 0.2 and 0.5 M. the Dilute solutions were prepared from concentrated acid after removal of the oxides of nitrogen by boiling for 10−15 min.
Sulfuric acid GOST 4204−77, diluted 1:1, 1:10 and 1:49.
Tartaric acid according to GOST 5817−77, solutions of 50 and 500 g/DM.
Ammonia water according to GOST 3760−79.
Bromine according to GOST 4109−79.
Water saturated bromine.
Phenol, a solution of 10 g/DM.
Hydrogen peroxide according to GOST 10929−76.
N-nitroso-N-phenylhydroxylamine ammonium salt (cupferron), a solution of 1 g/DM, freshly prepared. Prepare chilled to 10 °C water. Use only the light reagent.
Chloroform.
Gelatin food according to GOST 11293−89, a solution of 5 g/DM, freshly prepared.
Potassium permanganate according to GOST 20490−75 and 0.1 M solution.
Ethyl alcohol GOST 18300−87.
Congo red indicator paper.
Phenylfluorone (2, 3, 7, trihydroxy-9-phenyl-6-fluoron).
Tin GOST 860−75.
Phenolphthalein solution 1 g/lin ethanol.
(Changed edition, Rev. N 2).
3. PREPARATION FOR ASSAY
3.1. Preparation of standard solutions of tin
Solution a: 0,1000 g of tin are dissolved in 10 cmof sulphuric acid and evaporated to release vapors of sulfuric acid. After cooling dilute sulfuric acid solution (1:10), transferred into a measuring flask with volume capacity of 1000 cm, made up to the mark with sulfuric acid solution (1:9) and stirred.
1 cmof solution A contains 0.1 mg of tin.
Solution B: 10 cmsolution And transferred to a volumetric flask with a capacity of 100 cm, adjusted to the mark with sulfuric acid solution (1:10) and stirred; prepared prior to use.
1 cmof a solution contains 0.01 mg of tin.
3.2. Preparation of the alcoholic solution phenylfluorone 0.3 g/DM:
0.03 g phenylfluorene dissolved in 100 cmof ethanol with the addition of 1 cmof sulfuric acid solution (1:1) by heating on a water bath until a clear solution.
3.1, 3.2. (Changed edition, Rev. N 2).
3.3. To build a calibration curve in five of the six tumblers with a capacity of 50 cmmeasure: 0,5; 1; 3; 4 and 6 cmstandard solution B, corresponding to 5, 10, 30, 40 and 60 micrograms of tin.
Evaporated to release vapors of sulfuric acid. The sixth glass solution B is added. After cooling to all the beakers add 5 cmof tartaric acid solution 50 g/DM, transferred to volumetric flasks with a capacity of 25 cmand washed the glasses with a solution of sulfuric acid (1:49). The solution is neutralized with ammonia on indicator paper Congo red solution or phenolphthalein to an alkaline reaction, then add 1.6 cmof sulfuric acid solution (1:1) and 2−3 drops of bromine water to give a slightly yellow color. After 5 minutes, add dropwise a solution of phenol until complete discoloration of the solution, 2.5 cmgelatin solution and 5 cmof the solution phenylfluorone. After each addition of the reagent the solution was stirred. Top up with water to the mark and mix again. After 20 minutes, measure the optical density of the solution at a wavelength of 510 nm on the spectrophotometer or in a region of wavelength 510−530 nm on a photoelectrocolorimeter.
Solution comparison is the solution not containing a standard solution of tin.
According to the obtained values of optical density and corresponding contents of the tin to build the calibration graph.
(Changed edition, Rev. N 1, 2).
4. ANALYSIS
The weight of the portion of the alloy is selected depending on the expected mass fraction of tin in accordance with the table.1. A portion of the alloy is dissolved by heating in nitric acid solution (1:1) with the addition of tartaric acid solution 500 g/DM, the number of which is also shown in table.1. The solution was transferred to a volumetric flask with a capacity of 250 cm, cooled, made up to the mark with water and mix. Taken in a glass aliquot part of the solution, depending on the mass fraction of tin, as indicated in the table.1.
Table 1
Mass fraction of tin, % | The weight of the portion of the sample, g | The volume of solution of nitric acid (1:1) for dissolution, cm |
The amount of tartaric acid solution 500 g/DMfor dissolution, cm |
The volume aliquote part of the analyzed solution, see |
From 0.001 to 0.005 |
2,0000 | 60 | 5 | 100 |
SV. 0,005 «0,01 |
1,0000 | 30 | 2,5 | 50 |
«0,01» 0,1 |
0,2500 | 15 | 1,5 | 50 |
«To 0.1» to 0.6 |
Of 0.2000 | 15 | 1,5 | 10 |
The selected solution add 5−6 drops of hydrogen peroxide solution, is evaporated first on a sand bath to a volume of about 5 cm, then the water bath to wet salts.
The residue is dissolved in 10 cmof 0.5 M nitric acid solution. The solution was transferred to a separatory funnel with a capacity of 100 cm. The glass is washed with water, the washings attached to the solution in a separating funnel and the volume was adjusted solution with water to 20 cm. Pour 0.5 cmof a solution of potassium permanganate, 3 cmof a solution of cupferron and stirred. Then add 5 cmof chloroform and shake for 1 min and Extracted three times, adding each time 3 cmof a solution of cupferron and 5 cmof chloroform. Chloroformate extracts is collected in separate separatory funnel with a capacity of 100 cmand washed three times with 0.2 M solution of nitric acid in portions of 5 cm. The aqueous solution discarded.
Hloroformny washed solution was transferred to a beaker and remove the bulk of the chloroform on a water bath, leaving a volume of about 1 cm, then add 5 cmof nitric acid and continue evaporation to remove the chloroform. Cool, add 5 cmof sulfuric acid solution (1:1) and evaporated on a sand bath until vapors escaping sulfuric acid.
For the removal of organic substances contained in the solution, add 1−2 drops of hydrogen peroxide solution and again evaporated on a sand bath until vapors escaping sulfuric acid. Then cool, add 0.5 cmof water, again evaporated to a volume of 0.5 cmand cool. Pour 5 cmof tartaric acid solution 50 g/DM, is heated to a temperature of 50−60 °C and after cooling transferred to a volumetric flask with a capacity of 25 cm. In the presence of a precipitate of lead sulfate the solution was filtered through a small tight filter, collecting the filtrate in a volumetric flask with a capacity of 25 cm. The precipitate of lead sulphate is washed with sulfuric acid solution (1:49) the glass is washed with the same solution. The solution is neutralized with ammonia on indicator paper Congo red solution or phenolphthalein to an alkaline reaction, then add 1.6 cmof sulfuric acid solution (1:1) and then do as stated in claim 3.3.
Solution comparison is the solution of the reference experiment.
Mass of tin find for the calibration schedule.
(Changed edition, Rev. N 1, 2).
5. PROCESSING OF THE RESULTS
5.1. Mass fraction of tin () in percent is calculated by the formula
,
where — weight of tin in the sample solution, found by calibration schedule, mcg;
— volume of initial solution alloy, cm;
— weight alloy, g;
— volume aliquote part of the solution, cm.
5.2. The discrepancy between the results of parallel measurements (the difference between the largest and smallest results of parallel measurements) and the discrepancy between the results of the analysis (the difference between the larger and the smaller of the results of the analysis) at a confidence level =0.95 does not exceed the permissible values of absolute differences are given in table.2.
Table 2
Mass fraction of tin, % | The limit of error of the results of the analysis , % |
The discrepancy between the results of parallel measurements , % |
The discrepancy between the results of the analysis , % |
From 0,0010 to 0,0020 incl. | 0,0002 |
0,0003 | 0,0003 |
SV. 0,0020 «0,0050 « | 0,0004 |
0,0005 | 0,0005 |
«0,0050» 0,010 « | 0,0009 |
0,0012 | 0,0012 |
«0,010» 0,020 « | 0,002 |
0,002 | 0,002 |
«0,020» 0,050 « | 0,003 |
0,004 | 0,004 |
«0,050» 0,10 « | 0,006 |
0,008 | 0,008 |
«To 0.10» to 0.20 « | 0,02 |
0,02 | 0,02 |
«To 0.20» to 0.60 « | 0,02 |
0,03 | 0,03 |
The control accuracy of the analysis is carried out using standard samples or by other methods stipulated by GOST 1293.0−83.
The error analysis results (at a confidence probability =0,95) does not exceed the limit values given in table.2, if the following conditions are true: the discrepancy between the results of parallel measurements does not exceed the permissible, the results of accuracy control positive.
(Changed edition, Rev. N 2).