GOST 21877.1-76
GOST 21877.1−76 Babbit tin and lead. Method for the determination of antimony (with Amendments No. 1, 2)
GOST 21877.1−76
Group B59
STATE STANDARD OF THE USSR
BABBIT TIN AND LEAD
Method for the determination of antimony
Tin and lead babbits. Method for the determination of antimony*
AXTU 1709**
___________________
* The name of the standard. Changed the wording, Rev. N 2.
** Added, Rev. N 2.
Valid from 01.01.78
to 01.01.83*
______________________________
* Expiration removed
according to the Protocol of the Intergovernmental Council
for standardization, Metrology and certification
(IUS N 2, 1993). — Note
manufacturer database.
DEVELOPED by the Central research Institute for tin industry (Tsniiolovo)
Director V. A. Arsenico
Supervisor S. V. Meshkov
Executor G. V. Ivanova
INTRODUCED by the Ministry of nonferrous metallurgy of the USSR
Zam. Minister N.N. Chepelenko
The draft all-Union scientific research Institute of standardization (VNIIS)
Director A. V. Gichev
APPROVED AND promulgated by the Decree of the State Committee of standards of Ministerial Council of the USSR from may 24, 1976 N 1264
REPLACE GOST 1380.1−70
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 N 6 ICS 1983 ICS N 10 1987
This standard applies to tin and lead babbits and sets the volumetric method for determination of antimony (when the antimony content is from 5 to 20%).
The method is based on dissolving the sample in sulfuric acid, adding hydrochloric acid and subsequent titration of the amount of trivalent antimony and arsenic with a solution of potassium polnovatogo with the use of methyl orange as indicator.
(Changed edition, Rev. N 2).
1. GENERAL REQUIREMENTS
1.1. General requirements for method of analysis according to GOST 21877.0−76.
2. REAGENTS AND SOLUTIONS
Sulfuric acid according to GOST 4204−77.
Hydrochloric acid by the GOST 3118−77.
Note. On titration 20 cmof hydrochloric acid should be consumed no more than 0.1 cm
polnovatogo potassium.
Methyl orange (парадиметиламиноазобензолсульфокислый sodium), a solution of 1 g/DM.
Antimony metal according to GOST 1089−82, brand Soooo.
Potassium branovitsky according to GOST 4457−74, solution concentration of 0.05 mol/l; prepared as follows: 1,3917 g of reagent dissolved in water in a volumetric flask with a capacity of 1 DM
, adjusted to the mark with water and mix.
(Changed edition, Rev. N 1, 2).
3. ANALYSIS
3.1. A portion of the babbit weighing 0.5 g is placed in a conical flask with a capacity of 250 cm, pour 15−20 cm
of concentrated sulfuric acid and heat the flask for several minutes at a high temperature for distillation of sulfur. Then the beaker cover watch glass or small funnel and heated until complete dissolution of the alloy and whitening of the sludge. The flask is cooled, is added carefully along the walls of 50 cm
of water, 10 cm
of concentrated hydrochloric acid and boil for 5 minutes Then pour another 50 cm
of water, stirred, heated to 70−80 °C, add 2 drops of methyl orange indicator and titrated solution of potassium bromoperoxidase concentration of 0.05 mol/l
until the disappearance of the pink color. At the end of the titration, add another drop of indicator solution.
(Changed edition, Rev. N 2).
3.2. The installation of the mass concentration of the solution of potassium polnovatogo
0.1 g of powdered antimony metal is placed in a flask with a capacity of 250 cm, 30 cm, poured
concentrated sulfuric acid, cover the flask with a watch glass or funnel and heated to dissolve the metal. Next, the flask is removed, cooled and conduct analysis as indicated in claim 3.1.
Mass concentration of solution () Bromeliaceae potassium on antimony, expressed in g/cm
, is calculated by the formula
where — the weight of the portion of metallic antimony, g;
— number of bromoperoxidase solution of potassium consumed in the titration of antimony, cm
.
(Changed edition, Rev. N 1, 2).
4. PROCESSING OF THE RESULTS
4.1. The contents of antimony () in percent is calculated by the formula
where — volume of the solution polnovatogo potassium consumed in the titration, cm
;
— mass concentration of the solution polnovatogo potassium on antimony, g/cm
;
— weight of sample, g;
the arsenic content in the test sample in %, defined from a separate sample, as specified in GOST 21877.7−76;
— the ratio of arsenic to antimony.
(Changed edition, Rev. N 1, 2).
4.2. Allowable absolute differences the results of the analysis shall not exceed the values given in the table.
| The antimony content, % |
Allowable absolute differences, % |
| From 5 to 10 |
0,30 |
| SV. 10 «20 |
0,40 |
(Changed edition, Rev. N 2).
