GOST 1953.16-79
GOST 1953.16−79 Bronze tin. Method of determining titanium (with Amendments No. 1, 2)
GOST 1953.16−79
Group B59
INTERSTATE STANDARD
BRONZE TIN
Method of determining titanium
Tin bronze.
Method for the determination of titanium
AXTU 1709
Date of introduction 1981−01−01
INFORMATION DATA
1. DEVELOPED AND INTRODUCED by the Ministry of nonferrous metallurgy of the USSR
2. APPROVED AND put INTO EFFECT by Decision of the USSR State Committee for standards from
3. INTRODUCED FOR THE FIRST TIME
4. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS
The designation of the reference document referenced |
Section number, paragraph, sub-paragraph |
GOST 8.315−97 |
4.4 |
GOST 1953.1−79 |
1.1 |
GOST 3118−77 |
2 |
GOST 4204−77 |
2 |
GOST 4461−77 |
2 |
GOST 5017−74 |
Chapeau |
GOST 6552−80 |
2 |
GOST 10929−76 |
2 |
GOST 25086−87 |
Chapeau, 4.4 |
5. Limitation of actions taken by Protocol No. 5−94 of the Interstate Council for standardization, Metrology and certification (ICS 11−12−94)
6. EDITION with Amendments No. 1, 2 approved in February 1983, August 1990 (IUS 6−83, 11−90)
This standard sets the photometric method for the determination of titanium (0.02% to 0.2%) in tin bronze according to GOST 5017.
The method is based on the formation of titanium in sulfuric acid medium with hydrogen peroxide yellow-orange complex.
(Changed edition, Rev. N 2).
1. GENERAL REQUIREMENTS
1.1. General requirements for methods of analysis GOST 25086 with the Supplement according to claim 1.1 GOST 1953.1.
(Changed edition, Rev. N 1, 2).
2. APPARATUS, REAGENTS AND SOLUTIONS
Photoelectrocolorimeter or spectrophotometer.
Nitric acid according to GOST 4461.
Sulfuric acid according to GOST 4204, diluted 1:1 and 1:4.
Hydrochloric acid according to GOST 3118.
A mixture of acids, is prepared as follows: three parts hydrochloric acid is mixed with two parts of nitric acid.
Orthophosphoric acid according to GOST 6552.
Hydrogen peroxide (perhydrol) according to GOST 10929.
The titanium metal content not less than 99.5% titanium.
A standard solution of titanium; is prepared as follows: 0,201 g of titanium metal was dissolved with heating in 100 cmof sulphuric acid, diluted 1:4. Then when boiling, oxidize titanium, adding dropwise nitric acid to the bleaching solution. The solution was boiled for 2−3 min. After cooling, transferred to a volumetric flask with a capacity of 500 cm, made up to the mark with water and mix.
1 cmof a solution containing 0.0004 g of titanium.
3. ANALYSIS
3.1. A sample of alloy weighing 1 g is placed in a beaker with a capacity of 250 cm, add 15 cmof a mixture of acid, cover with watch glass and dissolved by heating, to the solution was added 20 cmof sulphuric acid diluted 1:1, and is evaporated prior to the allocation of white smoke of sulfuric acid. After cooling, the glass and walls of beaker rinse with water and repeat the evaporation to start the selection of a white smoke of sulfuric acid. After cooling, the residue is dissolved in water, transfer the solution into a volumetric flask with a capacity of 100 cm, add 3 cmof phosphoric acid, 1 cmof hydrogen peroxide, made up to the mark with water, mix and measure optical density of solution on a photoelectrocolorimeter with a blue filter or on a spectrophotometer at 410 nm in a cuvette with a thickness of absorbing layer 1 cm. Solution comparison is the same solution without hydrogen peroxide.
3.2. Construction of calibration curve
In a volumetric flask with a capacity of 100 cmpour 0; 0,5; 1,0; 2,0; 3,0; 4,0; 5,0 7.0 cm anda standard solution of titanium, 20 cmof sulphuric acid diluted 1:1, 3 cmof phosphoric acid, 1 cmof hydrogen peroxide, made up to the mark with water and mix. Further analysis are as indicated in claim 3.1.
4. PROCESSING OF THE RESULTS
4.1. Mass fraction of titanium () in percent is calculated by the formula
,
where the amount of titanium was found in the calibration schedule g;
— the mass of alloy,
4.2. Discrepancies in the results of parallel definitions should not exceed the values of permissible differences (the rate of convergence for 3), specified in the table.
Mass fraction of titanium,% |
, % |
, % |
From 0.02 to 0.05 incl. |
0,005 |
0,007 |
SV. 0,05 «0,1 « |
0,01 |
0,01 |
«0,1» 0,2 « |
0,02 |
0,03 |
(Changed edition, Rev. N 2).
4.3. Discrepancies in the results analysis, obtained in two different laboratories or two of the results of analysis obtained in the same laboratory but under different conditions (a measure of reproducibility) shall not exceed the values given in the table.
4.4. Control of accuracy of analysis results is carried out according to State standard samples of tin bronzes, re-approved by GOST 8.315, or by a method of additives in accordance with GOST 25086.
4.3, 4.4. (Added, Rev. N 2).