GOST 25278.4-82
GOST 25278.4−82 Alloys and alloys of rare metals. Methods for determination of yttrium (Change No. 1)
GOST 25278.4−82
Group B59
STATE STANDARD OF THE USSR
ALLOYS AND ALLOYS OF RARE METALS
Methods for determination of yttrium
Alloys and foundry alloys of rare metals. Methods for determination of yttrium
AXTU 1709
Valid from 01.07.83
to 01.07.93*
_______________________________
* Expiration removed
according to the Protocol of the Intergovernmental Council
for standardization, Metrology and certification
(IUS N 2, 1993). — Note the manufacturer’s database.
INFORMATION DATA
1. DEVELOPED AND INTRODUCED by the Ministry of nonferrous metallurgy of the USSR
PERFORMERS
Yu. A. Karpov, E. G. Nembrini, V. G., Miscreants, G. N. Andrianov, E. S. Danilin, M. A. Desyatkova L. I. Kirsanova, T. M. Malyutina, Y. F. Markov, V. M. Mikhailov, L. A. Nikitina, L. G. Obruchkova, N. Rasnitsyn, N. Suvorova, L. N. Filimonov
2. APPROVED AND put INTO EFFECT by Decision of the USSR State Committee for standards from
3. The period of examination — 1993
The frequency of inspection — 5 years
4. INTRODUCED FOR THE FIRST TIME
5. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS
| The designation of the reference document referenced |
Item number |
| GOST 61−75 |
2.1 |
| GOST 3117−78 |
2.1 |
| GOST 3118−77 |
2.1, 3.1 |
| GOST 3760−79 |
2.1, 3.1 |
| GOST 4461−77 |
3.1 |
| GOST 4463−76 |
3.1 |
| GOST 10652−73 |
2.1, 3.1 |
| GOST 18300−87 |
2.1 |
| GOST 26473.0−85 |
1.1 |
6. Validity extended until
7. REPRINT (November 1988) with amendment No. 1, approved in October 1987 (ICS 1−88).
This standard specifies a direct chelatometric method for the determination of yttrium (20 to 40%) in binary alloys magnesium-yttrium and indirect chelatometric method for the determination of yttrium (10 to 15%) in binary alloys, Nickel-yttrium.
1. GENERAL REQUIREMENTS
1.1. General requirements for methods of analysis and security requirements — according to GOST 26473.0−85.
(Changed edition, Rev. N 1).
2. CHELATOMETRIC METHOD FOR THE DETERMINATION OF YTTRIUM IN THE ALLOYS MAGNESIUM-YTTRIUM
The method is based on the direct complexometric titration of yttrium at pH 4,5−4,8 with a mixed indicator a mixture of kylinalove orange with methylene blue. Magnesium definition does not interfere.
2.1. Apparatus, reagents and solutions
Tile electric.
Analytical scale.
Libra technical.
Conical flasks with a capacity of 250 cm.
Measuring beakers with a capacity of 25 and 100 cm.
Burette with a capacity of 25 cm.
Hydrochloric acid by the GOST 3118−77, diluted 1:1.
Ammonia water according to GOST 3760−79 diluted 1:1.
Ammonium acetate according to GOST 3117−78.
Acetic acid GOST 61−75, solution 1 mol/DM: 5.6 cm
of glacial acetic acid diluted to 100 cm
with water.
Buffer solution (pH 4.5): 7,7 t* ammonium acetate dissolved in 100 cmof solution of acetic acid 1 mol/DM
.
_________________
* The text matches the original. — Note the manufacturer’s database.
The technical rectified ethyl alcohol GOST 18300−87.
Selenology orange, an aqueous solution of 5 mg/cm.
Methylene blue alcohol solution of 1 mg/cm.
Indicator paper Congo.
Mixed indicator: 9 cmsolution kylinalove orange pour 1 cm
of a solution of methylene blue.
Salt is the disodium Ethylenediamine-N, N, N', N'-tetraoxane acid, 2-water (Trilon B) according to GOST 10652−73, solution 0,05 mol/l; prepared as follows: 18.6 g Trilon B dissolved in water with heating (if the solution is turbid, it is filtered), transferred to a volumetric flask with a capacity of 1 DM
, is cooled and adjusted to the mark with water.
The ratio of the molarity of the solution Trilon B is determined by solution of salt of zinc (GOST 10398−76).
(Redrafted From
M. N 1).
2.2. Analysis
A portion of the sample weighing 0.2 g was placed in a conical flask with a capacity of 250 cmand dissolved by heating in 10 cm
of hydrochloric acid (1:1), the resulting solution is evaporated to a volume of 2−3 cm
. Dilute with water to 100 cm
, neutralized paper Congo ammonia before the dyeing of paper of the Congo from blue to purple (pH about 4), pour 5 cm
buffer solution, 1 cm
of a solution of the mixed indicator and titrate the yttrium solution Trilon B before transition of colouring from violet to bright green.
(Changed edition, Rev. N 1).
2.3. Processing of the results
2.3.1. Mass fraction of yttrium () in percent is calculated by the formula
where — volume of solution Trilon B, used for titration, cm
;
0,004445 — the concentration of the solution Trilon B by yttrium, g/cm;
— the ratio of the molarity of the solution Trilon B;
— the weight of the portion of the sample,
2.3.2. Discrepancies between the results of two parallel determinations and the results of the two tests should not exceed the values of permissible differences given in the table.
| Mass fraction of yttrium, % |
The allowable divergence, % |
| 20,0 |
0,6 |
| 30,0 |
0,8 |
| 40,0 |
1,1 |
2.3.1,
3. CHELATOMETRIC METHOD FOR THE DETERMINATION OF YTTRIUM IN NICKEL-YTTRIUM
The method is based on the formation kompleksonatov yttrium and Nickel, the subsequent destruction of complexonate yttrium fluoride, and titrate the liberated Trilon B solution of zinc at pH 5.8−6.0 with indicator kylinalove orange.
3.1. Apparatus, reagents and solutions
Tile electric.
Analytical scale.
Libra technical.
Burettes with a capacity of 25 cm.
Pipettes without dividing by 25 cm.
Conical flasks with a capacity of 250 cm.
Glasses glass with a capacity of 200 cm.
Measuring beakers with a capacity of 50 and 100 cm.
Volumetric flasks with a capacity of 100 and 1000 cm.
Nitric acid GOST 4461−77 diluted 1:1.
Hydrochloric acid by the GOST 3118−77, diluted 1:1.
Ammonia water according to GOST 3760−79 diluted 1:1 and 1:5.
Methenamine according to GOST 1381−73.
Sodium fluoride according to GOST 4463−76.
Selenology orange, an aqueous solution of 1 mg/cm.
Indicator paper Congo.
Salt is the disodium Ethylenediamine-N, N, N', N'-tetraoxane acid, 2-water (Trilon B) according to GOST 10652−73, solutions 70 g/DMand 0.05 mol/DM
.
The Trilon B solution, 0.05 mol/l; prepared as follows: 18.6 g Trilon B dissolved in water with heating (if the solution is turbid, it is filtered), transferred to a volumetric flask with a capacity of 1 DM
, is cooled and adjusted to the mark with water. The ratio of the molarity of the solution Trilon B is determined by solution of salt of zinc (GOST 10398−76).
(Changed edition, Rev.
N 1).
3.2. Analysis
A portion of the sample weighing 2 g was placed in a conical flask with a capacity of 250 cmand dissolved by heating in a mixture of 30 cm
of hydrochloric acid with 20 cm
of nitric acid. The solution was cooled, transferred to a volumetric flask with a capacity of 100 cm
, adjusted to the mark with water and mix.
In a conical flask with a capacity of 250 cmtaken 25 cm
of the resulting solution, diluted to 100 cm
with water, neutralized paper Congo ammonia until the color of the paper from blue to purple, add 1 g hexamine, 5−7 drops of kylinalove orange and pour the solution Trilon B 70 g/DM
to change the color of the solution from purple to green. Excess Trilon B titrated with a solution of zinc to the transition of color from green to purple. Then add 1−1. 5 g of sodium fluoride, mix well and titrate the liberated Trilon B solution of the zinc until a stable violet colour
.
3.3. Processing of the results
3.3.1. Mass fraction of yttrium () in percent is calculated by the formula
where is the volume of solution of zinc chloride, used for titration, cm
;
0,004445 — the concentration of the solution Trilon B by yttrium, g/cm;
— the ratio of the molarity of the solution Trilon B;
— capacity volumetric flasks, cm
;
— the weight of the portion of the sample, g;
— aliquotes volume of the solution taken for titration, see
.
3.3.2. Discrepancies between the results of two parallel determinations and the results of the two tests should not exceed 0.4%.
3.3.1,
