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GOST 20068.4-88

STATE P 57376-2016 GOST 193-2015 GOST 27981.5-2015 GOST 27981.2-2015 GOST 27981.1-2015 GOST 13938.11-2014 GOST P 56240-2014 GOST 859-2014 GOST P 55685-2013 STATE P 54922-2012 STATE STANDARD P 54310-2011 GOST 31382-2009 STATE R 52998-2008 GOST 859-2001 GOST 6674.4-96 GOST 6674.3-96 GOST 6674.2-96 GOST 6674.1-96 GOST 4515-93 GOST 28515-97 GOST 17328-78 GOST 614-97 GOST 15527-70 GOST 13938.13-77 GOST 13938.13-93 GOST 1020-77 GOST 5017-2006 GOST 1652.11-77 GOST 15027.12-77 GOST 15027.11-77 GOST 493-79 GOST 1953.9-79 GOST 23859.2-79 GOST 1953.5-79 GOST 1953.3-79 GOST 1953.12-79 GOST 1953.6-79 GOST 15027.18-86 GOST 27981.2-88 GOST 27981.5-88 GOST 15027.5-77 GOST 1652.12-77 GOST 15027.8-77 GOST 1652.7-77 GOST 15027.6-77 GOST 15027.7-77 GOST 1652.2-77 GOST 1652.4-77 GOST 15027.2-77 GOST 1652.8-77 GOST 1652.3-77 GOST 13938.6-78 GOST 13938.7-78 GOST 13938.1-78 GOST 13938.2-78 GOST 13938.4-78 GOST 13938.8-78 GOST 13938.10-78 GOST 13938.12-78 GOST 23859.8-79 GOST 1953.1-79 GOST 613-79 GOST 9716.2-79 GOST 23912-79 GOST 23859.1-79 GOST 23859.4-79 GOST 1953.2-79 GOST 20068.1-79 GOST 9717.3-82 GOST 9717.1-82 GOST 27981.4-88 GOST 28057-89 GOST 6674.5-96 GOST 23859.11-90 GOST 24978-91 GOST 15027.14-77 GOST 15027.10-77 GOST 15027.4-77 GOST 1652.6-77 GOST 1652.10-77 GOST 15027.9-77 GOST 13938.5-78 GOST 13938.11-78 GOST 18175-78 GOST 13938.3-78 GOST 23859.6-79 GOST 1953.4-79 GOST 1953.8-79 GOST 1953.7-79 GOST 23859.9-79 GOST 1953.11-79 GOST 1953.15-79 GOST 1953.10-79 GOST 1953.16-79 GOST 23859.5-79 GOST 23859.3-79 GOST 9716.3-79 GOST 1953.14-79 GOST 15027.16-86 GOST 15027.17-86 GOST 27981.6-88 GOST 27981.1-88 GOST 15027.20-88 GOST 17711-93 GOST 1652.1-77 GOST 15027.13-77 GOST 1652.5-77 GOST 15027.1-77 GOST 1652.13-77 GOST 1652.9-77 GOST 15027.3-77 GOST 13938.9-78 GOST 23859.10-79 GOST 193-79 GOST 20068.2-79 GOST 1953.13-79 GOST 23859.7-79 GOST 9716.1-79 GOST 20068.3-79 GOST 24048-80 GOST 9717.2-82 GOST 15027.15-83 GOST 15027.19-86 GOST 27981.3-88 GOST 20068.4-88 GOST 27981.0-88 GOST 13938.15-88 GOST 6674.0-96

GOST 20068.4−88 Bronze without tin. X-ray spectral fluorescent method for determination of aluminium


GOST 20068.4−88

Group B59


INTERSTATE STANDARD

BRONZE WITHOUT TIN

Method x-ray
fluorescence determination of aluminum

Tinless bronze.
X-ray spectral fluorescent method for determination of aluminium


AXTU 1709

Date of introduction 1989−01−01


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 24.02.88 N 352

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 15027.2−77
5.4.1
GOST 18175−78
Chapeau
GOST 25086−87
1.1

5. Limitation of actions taken by Protocol No. 3−93 Interstate Council for standardization, Metrology and certification (ICS 5−6-93)

6. REISSUE


This standard specifies a method for x-ray fluorescence determination of aluminum in bronze brand Brazh9−4 according to GOST 18175 standard samples (in mass fraction of aluminum from 7.0% to 12.0%).

X-ray fluorescence method of determination based on the intensity of the characteristic secondary x-ray radiation of the elements from their percentage in the sample irradiated with primary rays of the x-ray tube. Radiation from the sample enters the spectrometer channels of the fixed type, each of which with the crystal-analyzer of the characteristic line is allocated one element, the intensity of which is recorded the electronic computing device on the digital Board and is written tsifropechatayuschee machine.

1. GENERAL REQUIREMENTS

1.1. General requirements for method of analysis according to GOST 25086.

2. EQUIPMENT AND MATERIALS


The x-ray multichannel spectrometer of the type CPM-18 CPM or-20 or similar.

X-ray devices.

The x-ray tube of the type BHV-9, bkhv-12, bkhv-13 with palladium anode or similar.

Argon-methane mixture according to normative-technical documentation.

Screw-cutting lathe of the type ІП611 for sharpening standard samples and unknown samples.

The set of State standard samples N 126, 1720−79 GSO — GSO 1724−79; allowed to use standard samples of the enterprise and industry standard samples.

3. PREPARATION FOR ASSAY


Sample preparation and standard samples for the analysis consists of identical grinding them on a lathe and wipe the surface of the analyzed technical alcohol. Honed the surface of the sample and the standard sample must be flat, smooth, does not have shrink holes, pores, cracks, slag and non-metallic inclusions.

4. ANALYSIS

4.1. Spectrometric channel for the analysis of aluminium is tuned to the wavelength 8339·10ГОСТ 20068.4-88 Бронзы безоловянные. Метод рентгеноспектрального флуоресцентного определения алюминияm. the Angle of reflection of the crystal-analyzer ЕДdT is 71°12'. As the x-ray detector uses a gas flow proportional counter BJP-3−05 with argon-methane filling. The intensity of the analytical lines of aluminum measured by a Timer in ГОСТ 20068.4-88 Бронзы безоловянные. Метод рентгеноспектрального флуоресцентного определения алюминияseries.

4.2. The mode of operation of the x-ray tube and the electronic computing device is selected in the range:

25−50 kV — voltage on the tube;

15−100 mA anode current;

40−250 — gain;

0−9,5 — lower threshold;

0,5−9,0 V — window width;

4.0 to 6.0 volts — max amplitude distribution;

15−200 — exposure.

4.3. Analyze a sample placed in the cuvette set in the loading chamber of a spectrometer head, paying particular attention to the absence of distortions, and close the lid. Further, the measurement cycle is automatic. The measurement results are output to tsifropechatayuschee typewriter or on a computer. Check the intensity of the analytical lines of aluminum from the sample and carried out at least twice.

5. PROCESSING OF THE RESULTS

5.1. The calibration graphs are built in coordinates ГОСТ 20068.4-88 Бронзы безоловянные. Метод рентгеноспектрального флуоресцентного определения алюминия, where ГОСТ 20068.4-88 Бронзы безоловянные. Метод рентгеноспектрального флуоресцентного определения алюминияthe count rate or the relative intensity of fluorescent x-rays; ГОСТ 20068.4-88 Бронзы безоловянные. Метод рентгеноспектрального флуоресцентного определения алюминия — mass fraction of the element in the standard sample, %.

Mass fraction of aluminium in the sample find for the calibration graphics, built according to the averaged results of at least two parallel measurements of the intensity of the analytical line.

5.2. Control the convergence of the results of the analysis

5.2.1. The convergence of the results of the analysis is characterized by the difference between the results of parallel measurements of mass fraction of aluminium in the analyzed sample. The absolute discrepancy between the results of parallel measurements (ГОСТ 20068.4-88 Бронзы безоловянные. Метод рентгеноспектрального флуоресцентного определения алюминияthe rate of convergence) must not exceed 0.15% at the confidence probability ГОСТ 20068.4-88 Бронзы безоловянные. Метод рентгеноспектрального флуоресцентного определения алюминия=0,95.

5.2.2. The final result of the analysis taking the arithmetic mean of two parallel definitions.

5.2.3. In case of exceeding of permissible values of analysis again.

5.3. Control the reproducibility of the results of the analysis

5.3.1. The reproducibility of the results is characterized by the absolute discrepancy between the results of the analysis (ГОСТ 20068.4-88 Бронзы безоловянные. Метод рентгеноспектрального флуоресцентного определения алюминияthe measure of reproducibility) obtained in two different laboratories or in one laboratory, but under different conditions.

5.3.2. The absolute discrepancy between the results of the two tests should not exceed 0.20%.

5.3.3. If the discrepancy between the results of the initial and re-analyses ГОСТ 20068.4-88 Бронзы безоловянные. Метод рентгеноспектрального флуоресцентного определения алюминия(or analyses obtained in two different laboratories) does not exceed the permissible values, the repeatability is considered satisfactory.

5.4. Control of accuracy of analysis results

5.4.1. Control the accuracy of the results of the analysis of aluminium in bronze brand Brazh9−4 check of State standard samples (set No. 126), held through the entire course of the analysis.

The sample analysis results are considered accurate if the absolute difference between the found and the certified mass fraction of aluminium in bronze brand Brazh9−4 does not exceed 2/3 of the allowable absolute discrepancies in the results of the two tests.

The differences in the assessment of the quality of the brand of bronze Brazh9−4 determination of aluminium is carried out according to GOST 15027.2.