GOST 16882.1-71
GOST 16882.1−71 Silver-copper-phosphorus solders. Method for determination of silver content (with Amendments No. 1, 2)
GOST 16882.1−71*
Group B59
STATE STANDARD OF THE USSR
SILVER-COPPER-PHOSPHORUS SOLDERS
Method for determination of silver content
Silver-copper-phosphorus solders. Method for determination of silver content
AXTU 1709
Date of introduction 1972−07−01
The decision of the State standards Committee of the USSR Council of Ministers dated 9 April 1971 N 713 introduction installed with 01.07.72
Proven in 1985 by the Resolution of Gosstandart from
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** Expiration removed by Protocol No. 5−94 of the Interstate Council for standardization, Metrology and certification (I & C N 11/12, 1994). — Note the manufacturer’s database.
* REVISED (July 1986) with Amendments No. 1, 2 approved in March 1981, February 1985 (IUS 6−81, 5−85).
This standard applies to silver-copper-phosphorus solders and sets potentiometric method for the determination of silver (at a mass fraction of silver from 10.0 to 72,0%).
The method is based on potentiometric titration of silver ion with a solution of sodium chloride. As the reference electrode used silver chloride electrode, filled with saturated solution of potassium nitrate. The indicator electrode is a silver wire.
1. GENERAL REQUIREMENTS
1.1. General requirements for method of analysis according to GOST 22864−83.
2. APPARATUS, REAGENTS AND SOLUTIONS
Laboratory pH meter.
The magnetic stirrer.
The block automatic titration laboratory.
Burette with automatic zero setting capacity of 50 cm.
Nitric acid GOST 4461−77 diluted 1:1.
Silver brand SR 999,9 according to GOST 6836−80*.
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* On the territory of the Russian Federation GOST 6836−2002. — Note the manufacturer’s database.
Sodium chloride according to GOST 4233−77, 0,1 n. solution; prepared from fixanal 0.1 g/EQ. In the absence of fiksanala dissolved in water 5,85 g of sodium chloride and the volume was adjusted to 1 DMwith water.
Titer of 0.1 n sodium chloride solution set as follows: a portion of silver is 0.45 g (take three parallel sample) were placed in a glass with a capacity of 250 cm, was dissolved with heating in 10 cm
of nitric acid, diluted 1:1, heated to remove oxides of nitrogen and dilute with water to 100 cm
. The solution was titrated as described in sec. 4.
3. PREPARATION FOR ASSAY
3.1. The sample shall be in the form of strips or chips.
A suspension of 1.0 g (three parallel) placed in a beaker with a capacity of 250 cm, was dissolved with heating in 10 cm
of nitric acid, diluted 1:1. The solution is heated to remove oxides of nitrogen and dilute with water to 100 cm
.
(Changed edition, Rev. N 2).
4. ANALYSIS
4.1. Prepared for the analysis of the solution is titrated potentiometric method of 0,1 n solution of sodium chloride to a predetermined potential difference on the block automatic titration.
(Changed edition, Rev. N 1).
5. CALCULATION OF RESULTS OF ANALYSIS
5.1. Mass fraction of silver () in percent is calculated by the formula
where — amount of 0.1 n sodium chloride solution consumed for titration, in cm
;
the titer of a solution of sodium chloride, expressed in g/cm
of silver;
— hanging in the city
5.2. Allowable absolute discrepancies in the results of parallel measurements at a confidence probability of 0.95 should not exceed 0.15%.
(Changed edition, Rev. N 2).
