GOST 16883.3-71

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  ГОСТ 16883.3-71

GOST 16883.3−71 Silver-copper-zinc solders. Spectral method for determination of lead, iron and bismuth (with Amendments No. 1, 2)

GOST 16883.3−71*

Group B59

STATE STANDARD OF THE USSR

SILVER-COPPER-ZINC SOLDERS

Spectral method for determination of lead, iron and bismuth

Silver-copper-zinc solders. Spectral method for determination of lead,
iron and bismuth 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 21.02.85 N 346 the validity extended to 01.01.91**
_______________
** 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.

INSTEAD of OST 2987 in the determination of lead

* 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-zinc solders and sets the spectral method for determination of lead, iron and bismuth (in mass fraction of lead and iron from 0.01 to 0.2 percent; bismuth from 0.001 to 0.02%).

The method is based on measuring pucherani analytical lines in the arc spectrum. Communication pucherani with a mass fraction is set to the calibration graph, built on a series of standard samples.

The electrodes were applied to the rods of the analyzed alloy.

(Changed edition, Rev. N 1).

1. GENERAL REQUIREMENTS

1.1. General requirements for method of analysis according to GOST 22864−77*.
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* On the territory of the Russian Federation GOST 22864−83. — Note the manufacturer’s database.

2. APPARATUS, REAGENTS AND SOLUTIONS

Quartz spectrograph medium dispersion.

The generator is activated the arc AC.

Microphotometer.

Clips for electrodes with forced cooling.

Photographic plates of the spectral type II sensitivity of 10−15 units.

Standard samples of the enterprise.

N 1 the developer and fixer according to GOST 10691.0−84, GOST 10691.1−84.

(Changed edition, Rev. N 1).

3. PREPARATION FOR ASSAY

Samples and standard samples should be in the form of two cast iron rods with a length of 20−30 mm, with a diameter of 6 mm. rod Ends are sharpened to a hemisphere or a truncated cone with ground diameter of 1.5−1.7 mm.

For removal of surface contamination of the sample is boiled in hydrochloric acid, diluted 1:1, for 3 min, washed with water and dried.

(Changed edition, Rev. N 1).

4. ANALYSIS

Photographing the spectra produced by the spectrograph at a slit width of 0.015 mm, the distance between the electrodes is 1.5 mm, the strength of the arc current is 5A, the time of firing 30 s, exposure time 20 s. the Interelectrode gap is set by the template.

Electrodes serve as cast members. The spectra are photographed on photographic plates of the spectral type II.

Together with the analyzed samples on the same plate photographed spectra of standard samples analyzed grade alloy.

For each sample and the standard sample receive four parallel spectrogram.

Photographic plates showing within 3 min when the temperature of the developer is 18−20 °C. the Shown plate is rinsed in water, fixed, washed again and dried.

5. PROCESSING OF THE RESULTS

5.1. Wavelength of analytical spectral lines is given in the table.

Determination of the mass fraction of the elements are by the method of «three standards» with the objective photoretrieval. Build calibration graphs for each of the element.

Y-axis delay value difference pucherani line impurity and background, and on the x — axis is the log concentration of standard samples.

5.2. The convergence of the results of parallel measurements are characterized by a relative standard deviation equal to 0.08.

(Changed edition, Rev. N 2),

5.3. The final result of the analysis be the arithmetic mean of three parallel measurements obtained on the three spectrograms, provided

,

where is the greatest result of the parallel measurements;

least the result of the parallel measurements;

 — relative standard deviation describing repeatability of measurements;

 — the arithmetic mean calculated from parallel measurements (3).

(Changed edition, Rev. N 1).