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GOST 14339.4-82

GOST 33729-2016 GOST 20996.3-2016 GOST 31921-2012 GOST 33730-2016 GOST 12342-2015 GOST 19738-2015 GOST 28595-2015 GOST 28058-2015 GOST 20996.11-2015 GOST 9816.5-2014 GOST 20996.12-2014 GOST 20996.7-2014 GOST P 56306-2014 GOST P 56308-2014 GOST 20996.1-2014 GOST 20996.2-2014 GOST 20996.0-2014 GOST 16273.1-2014 GOST 9816.0-2014 GOST 9816.4-2014 GOST P 56142-2014 STATE STANDARD P 54493-2011 GOST 13498-2010 STATE STANDARD P 54335-2011 GOST 13462-2010 STATE STANDARD P 54313-2011 GOST P 53372-2009 GOST P 53197-2008 GOST P 53196-2008 GOST P 52955-2008 GOST P 50429.9-92 GOST 6836-2002 GOST 6835-2002 GOST 18337-95 GOST 13637.9-93 GOST 13637.8-93 GOST 13637.7-93 GOST 13637.6-93 GOST 13637.5-93 GOST 13637.4-93 GOST 13637.3-93 GOST 13637.2-93 GOST 13637.1-93 GOST 13637.0-93 STATE STANDARD 13099-2006 GOST 13098-2006 GOST 10297-94 GOST 12562.1-82 GOST 12564.2-83 GOST 16321.2-70 GOST 4658-73 GOST 12227.1-76 GOST 16274.0-77 GOST 16274.1-77 GOST 22519.5-77 GOST 22720.4-77 GOST 22519.4-77 GOST 22720.2-77 GOST 22519.6-77 GOST 13462-79 GOST 23862.24-79 GOST 23862.35-79 GOST 23862.15-79 GOST 23862.29-79 GOST 24392-80 GOST 20997.5-81 GOST 24977.1-81 GOST 25278.8-82 GOST 20996.11-82 GOST 25278.5-82 GOST 1367.7-83 GOST 26239.9-84 GOST 26473.1-85 GOST 16273.1-85 GOST 26473.2-85 GOST 26473.6-85 GOST 25278.15-87 GOST 12223.1-76 GOST 12645.7-77 GOST 12645.1-77 GOST 12645.6-77 GOST 22720.3-77 GOST 12645.4-77 GOST 22519.7-77 GOST 22519.2-77 GOST 22519.0-77 GOST 12645.5-77 GOST 22517-77 GOST 12645.2-77 GOST 16274.9-77 GOST 16274.5-77 GOST 22720.0-77 GOST 22519.3-77 GOST 12560.1-78 GOST 12558.1-78 GOST 12561.2-78 GOST 12228.2-78 GOST 18385.4-79 GOST 23862.30-79 GOST 18385.3-79 GOST 23862.6-79 GOST 23862.0-79 GOST 23685-79 GOST 23862.31-79 GOST 23862.18-79 GOST 23862.7-79 GOST 23862.1-79 GOST 23862.20-79 GOST 23862.26-79 GOST 23862.23-79 GOST 23862.33-79 GOST 23862.10-79 GOST 23862.8-79 GOST 23862.2-79 GOST 23862.9-79 GOST 23862.12-79 GOST 23862.13-79 GOST 23862.14-79 GOST 12225-80 GOST 16099-80 GOST 16153-80 GOST 20997.2-81 GOST 20997.3-81 GOST 24977.2-81 GOST 24977.3-81 GOST 20996.4-82 GOST 14338.2-82 GOST 25278.10-82 GOST 20996.7-82 GOST 25278.4-82 GOST 12556.1-82 GOST 14339.1-82 GOST 25278.9-82 GOST 25278.1-82 GOST 20996.9-82 GOST 12554.1-83 GOST 1367.4-83 GOST 12555.1-83 GOST 1367.6-83 GOST 1367.3-83 GOST 1367.9-83 GOST 1367.10-83 GOST 12554.2-83 GOST 26239.4-84 GOST 9816.2-84 GOST 26473.9-85 GOST 26473.0-85 GOST 12645.11-86 GOST 12645.12-86 GOST 8775.3-87 GOST 27973.0-88 GOST 18904.8-89 GOST 18904.6-89 GOST 18385.0-89 GOST 14339.5-91 GOST 14339.3-91 GOST 29103-91 GOST 16321.1-70 GOST 16883.2-71 GOST 16882.1-71 GOST 12223.0-76 GOST 12552.2-77 GOST 12645.3-77 GOST 16274.2-77 GOST 16274.10-77 GOST 12552.1-77 GOST 22720.1-77 GOST 16274.4-77 GOST 16274.7-77 GOST 12228.1-78 GOST 12561.1-78 GOST 12558.2-78 GOST 12224.1-78 GOST 23862.22-79 GOST 23862.21-79 GOST 23687.2-79 GOST 23862.25-79 GOST 23862.19-79 GOST 23862.4-79 GOST 18385.1-79 GOST 23687.1-79 GOST 23862.34-79 GOST 23862.17-79 GOST 23862.27-79 GOST 17614-80 GOST 12340-81 GOST 31291-2005 GOST 20997.1-81 GOST 20997.4-81 GOST 20996.2-82 GOST 12551.2-82 GOST 12559.1-82 GOST 1089-82 GOST 12550.1-82 GOST 20996.5-82 GOST 20996.3-82 GOST 12550.2-82 GOST 20996.8-82 GOST 14338.4-82 GOST 25278.12-82 GOST 25278.11-82 GOST 12551.1-82 GOST 25278.3-82 GOST 20996.6-82 GOST 25278.6-82 GOST 14338.1-82 GOST 14339.4-82 GOST 20996.10-82 GOST 20996.1-82 GOST 12645.9-83 GOST 12563.2-83 GOST 19709.1-83 GOST 1367.11-83 GOST 1367.0-83 GOST 19709.2-83 GOST 12645.0-83 GOST 12555.2-83 GOST 1367.1-83 GOST 9816.3-84 GOST 9816.4-84 GOST 9816.1-84 GOST 9816.0-84 GOST 26468-85 GOST 26473.11-85 GOST 26473.12-85 GOST 26473.5-85 GOST 26473.7-85 GOST 16273.0-85 GOST 26473.3-85 GOST 26473.8-85 GOST 26473.13-85 GOST 25278.13-87 GOST 25278.14-87 GOST 8775.1-87 GOST 25278.17-87 GOST 18904.1-89 GOST 18904.0-89 STATE STANDARD P 51572-2000 GOST 14316-91 GOST P 51704-2001 GOST 16883.1-71 GOST 16882.2-71 GOST 16883.3-71 GOST 8774-75 GOST 12227.0-76 GOST 12797-77 GOST 16274.3-77 GOST 12553.1-77 GOST 12553.2-77 GOST 16274.6-77 GOST 22519.1-77 GOST 16274.8-77 GOST 12560.2-78 GOST 23862.11-79 GOST 23862.36-79 GOST 23862.3-79 GOST 23862.5-79 GOST 18385.2-79 GOST 23862.28-79 GOST 16100-79 GOST 23862.16-79 GOST 23862.32-79 GOST 20997.0-81 GOST 14339.2-82 GOST 12562.2-82 GOST 25278.7-82 GOST 20996.12-82 GOST 12645.8-82 GOST 20996.0-82 GOST 12556.2-82 GOST 25278.2-82 GOST 12564.1-83 GOST 1367.5-83 GOST 25948-83 GOST 1367.8-83 GOST 1367.2-83 GOST 12563.1-83 GOST 9816.5-84 GOST 26473.4-85 GOST 26473.10-85 GOST 12645.10-86 GOST 8775.2-87 GOST 25278.16-87 GOST 8775.0-87 GOST 8775.4-87 GOST 12645.13-87 GOST 27973.3-88 GOST 27973.1-88 GOST 27973.2-88 GOST 18385.6-89 GOST 18385.7-89 GOST 28058-89 GOST 18385.5-89 GOST 10928-90 GOST 14338.3-91 GOST 10298-79 GOST P 51784-2001 GOST 15527-2004 GOST 28595-90 GOST 28353.1-89 GOST 28353.0-89 GOST 28353.2-89 GOST 28353.3-89 STATE STANDARD P 52599-2006

GOST 14339.4−82 Tungsten. Methods for determination of nitrogen, oxygen, hydrogen


GOST 14339.4−82

Group В69


STATE STANDARD OF THE USSR

TUNGSTEN

Methods for determination of nitrogen, oxygen, hydrogen

Tungsten. Methods for the determination of nitrogen, oxygen and hydrogen


Valid from 01.01.84
to 01.01.89*
________________________________
* Expiration removed
by the decree of Gosstandart of the USSR
from 27.09.91 N 1528 (IUS No. 12, 1991). -
Note the manufacturer’s database.



DEVELOPED by the Ministry of nonferrous metallurgy of the USSR

PERFORMERS

V. I. Veprintsev, S. N. Suvorova, N. With. Borodin, L. V. Mikhailov, V. V., Sultanian, N. P. Anikeeva, S. A. Isaev, V. I. Vinogradov, V. E. Chebotarev, V. D. Prilepskaya, A. Y. Abramov, N. B. Denisov, L. M. Efimov, K. Z. Salendo

INTRODUCED by the Ministry of nonferrous metallurgy of the USSR

Member of the Board of A. P. Snurnikov

APPROVED AND put INTO EFFECT by Decrees of the USSR State Committee for standards, dated 30 September 1982, N 3868

REPLACE GOST 14339.4−74


This standard sets the photometric method for the determination of nitrogen (at a mass proportion of from 0.0001 to 0.1%) and the method of reaction gas chromatography (reductive melting in an atmosphere of inert carrier gas argon or helium) to determine the oxygen (if oxygen mass fraction from 0.001 to 0.1%), hydrogen (with mass fraction of hydrogen from 0.0001 to 0.1%), nitrogen (in nitrogen mass fraction from 0.001 to 0.1%) in metallic tungsten (powder, rod billet, rod, wire, strip, foil).

1. GENERAL REQUIREMENTS

1.1. General requirements for methods of analysis GOST 14339.0−82.

2. PHOTOMETRIC METHOD


The method is based on the Stripping of the formed ammonia from the alkaline solution in a quartz apparatus (Kjeldahl) followed by absorption of ammonia with sulfuric acid and determining the nitrogen.

2.1. Apparatus, reagents and solutions

Quartz distillation apparatus for producing the double-distilled water.

Quartz distillation apparatus for distillation of ammonia.

Microburette with a capacity of 5 cmГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водородаand a burette with a capacity of 50 cmГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водородаaccording to GOST 1770−74.

Microbes MV-1 or any other type that allows you to weigh with an accuracy of 0.00001 g.

Types photoelectrocolorimeter FEK-56M, PEC-60.

The device for determination of nitrogen content (Fig.1) consists of the distillation flask 1 with ground stopper; funnel 2 for infusion of the study solution; eliminator 3; of the refrigerator 4, the ground to the drip tray and the receiver; the receiver 5 with ground stopper 6.

ГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водорода


Damn.1



Ammonium sulfate according to GOST 3769−78, OS.h. a standard solution is prepared by dissolving 0,01179 g of salt in bidistilled water in a volumetric flask with a capacity of 1000 cmГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водорода, top up the solution with bidistilled water to the mark and mix.

1 cmГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водородаof the solution contains 0,0000025 g of nitrogen.

Potassium hydroxide solution: 500 g of potassium hydroxide dissolved in a flask with a capacity of 2000 cmГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водорода, poured bidistillated water to a volume of more than 1000 cmГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водорода, evaporated to 1000 cmГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водородаand cooled to room temperature, and then close the flask with a stopper that is connected through the hole with a flask for washing of gases containing concentrated sulfuric acid.

Potassium sulfate according to GOST 4145−74, twice recrystallized.

Sulfuric acid GOST 4204−77, diluted 1:1 with bidistilled water pre-boiled in a quartz vessel.

0.02 N. sulfuric acid solution, prepared of fiksanala.

Hydrochloric acid by the GOST 3118−77, diluted 1:10.

The Help Of Nessler’s Reagent.

Reference solution: in a volumetric flask with a capacity of 50 cmГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водородаimpose 5 cmГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водородаof 0.02 n solution sulfuric acid, 0.5 cmГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водородаof the help of nessler’s reagent, made up to the mark with bidistilled water and stirred.

The technical rectified ethyl alcohol according to GOST 18300−72*.
________________
* On the territory of the Russian Federation GOST 18300−87. Here and further. — Note the manufacturer’s database data

H.

2.2. Preparation for assay

Samples of metal tungsten pre-comminuted, cleaned of contaminants and oxides, washed with hydrochloric acid (1:10), then with bidistilled water and finally washed with ethanol. After rinsing the sample was dried in air.

2.3. Analysis

2.3.1. Depending on the mass fraction of nitrogen taking sample in accordance with table.1.

Table 1

   
Mass fraction of nitrogen, % The mass of charge, g
From 0.0001 to 0.0005 to 1
SV. Of 0.0005 «to 0.001 0,5
«To 0.001» to 0.01 0,25
«0,01» 0,1 0,1



The sample is placed in a distillation flask, add 2 g of potassium sulfate, 10 cmГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водородаof sulphuric acid (1:1) and heated on an open hot plate until complete dissolution of the sample. After cooling, the solution is diluted with bidistilled water up to 50−60 cmГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водорода. Distillation flask with the solution attached to the installation.

The receiver is introduced 5 cmГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водородаof 0.02 n sulfuric acid solution and at a weak suction flow a small current of steam. Then slowly in small portions poured into the distillation flask through the funnel 80 cmГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водородаof a solution of potassium hydroxide to neutralize the acid and obtaining an alkaline environment.

After all lye is introduced into a flask, amplify the current of steam-air mixture and suctioning.

After the first drops of condensate distillation are still 15 min Released ammonia, entrained vapor, is absorbed in the receiver of 0.02 n sulfuric acid solution. Usually collected condensate and the acid of 30−40 cmГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водорода.

After a specified time turn off the vacuum, quickly open the tap funnel, allow air into the distillation flask and then turn off the steam.

Disconnect the refrigerator and transfer the resulting condensate in a volumetric flask with a capacity of 50 cmГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водорода. The fridge and the receiver is washed with bidistilled water, using minimal amounts of. Wash liquid is collected in a volumetric flask with condensation. Add in a flask of 0.5 cmГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водородаof a solution of Nessler, top up solution to the mark with bidistilled water and stirred.

The solution is kept for 30 min for the formation of complex compounds of ammonia with the help of nessler’s reagent. Then measure the optical density of the analyzed solutions and solutions comparison photocolorimeter with a blue filter (wavelength 440 nm) in a cuvette with a thickness of the light absorbing layer 50 mm. Simultaneously with the sample hold control experience for contamination of reagents through all stages of the analysis and using the same reagents and in the same amounts as in the analysis of the test sample

.

2.3.2. Construction of calibration curve

In a volumetric flask with a capacity of 50 cmГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водородаimpose 5 cmГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водородаof 0.02 n sulfuric acid solution, and then from 0.4 to 5 cmГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водорода(with an interval of 0.2 cmГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водорода) and from 5 to 40 cmГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водорода(every 5 cmГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водорода) of a standard solution of ammonium sulfate and 0.5 cmГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водородаof the help of nessler’s reagent. The solutions were topped up to the mark with bidistilled water and stirred. The solutions stand 30 min, measure the optical density of colored solutions and solution comparison photocolorimeter with a blue filter (wavelength 440 nm) in a cuvette with a thickness of the light absorbing layer was 50 mm. In a solution of comparison when measuring optical density using a solution containing all the applied reagents.

On the found values of optical densities and their corresponding nitrate concentrations to build calibration graphs

.

2.4. Processing of the results

2.4.1. Mass fraction of nitrogen (aГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водорода) percentage calculated by the formula

ГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водорода,


where ГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водородаthe amount of nitrogen in the sample solution, found by calibration schedule g;

ГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водородаthe amount of nitrogen in solution in the reference experiment, was found in the calibration schedule g;

ГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водорода — the weight of the portion,

2.4.2. Allowable absolute discrepancies in the results of parallel measurements at a confidence probability ГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водородаof 0.95 does not exceed the values given in table.2.

Table 2

   
Mass fraction of nitrogen, % Allowable absolute differences, %
From 0,0001 to 0,0003 0,00008
SV. The 0.0003 «to 0.0005 0,0001
«To 0.0005» 0,0015 0,0002
«0,0015» 0,005 0,0002
«0,005» 0,01 0,0002
«Is 0.01» to 0.03 0,002
«0,03» 0,1 0,008

3. THE METHOD OF REACTION GAS CHROMATOGRAPHY

The method of reaction gas chromatography is based on the release of hydrogen, nitrogen, oxygen, (regardless of their location) in the gas phase in the form of molecular hydrogen and nitrogen, and carbon monoxide, respectively, under conditions of intermittent (pulse) heating up to 3500 °C in a graphite capsule, with subsequent transportation of argon or helium gas mixture in the column of the gas chromatograph.

3.1. Equipment, reagents, solutions

Installation (DWG.2) for the determination of oxygen, hydrogen, nitrogen, consists of a balloon with argon or helium 1; gas chromatograph type lxm-8МД (model 1), lxm-72 or any other, not conceding on the parameters specified above, 2; recording type potentiometer KSP-4 (completed with a gas chromatograph) 3; pneumatic impulse resistance furnace (for analysis) 4; cylinder with argon or helium 5, 6; pneumatic impulse resistance furnace (for the preliminary degassing of the graphite capsules) 7; power supply pulse furnace 8 (Fig.3).

ГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водорода

Damn.2

ГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водорода


1 — automatic starter type AP 50−3M; 2 — autotransformer type OMN 40−250−75-Y4;
3 — voltmeter type e-378, 0−250 V; 4 — magnetic actuator type PME-222; 5 — transformer
type OSU-20/05, or any other similar type up to 5 kW; 6 — ammeter type e-378, 1000/5;
7 — current transformer of type TM-40, 1000/5; 8 — pulse-furnace; 9 — time switch-type VL 27У4
(providing exposure from 0 to 10). Intermediate relay type PE-21
(for relay); 10 — button pad of the type KMZ-2

Damn.3



Circuit for power pulse furnace allowed the use of other electrical equipment, providing the load current (the load is the graphite capsule) 500−600 And at a safe voltage of 10−12 V, pulsed 4−5 s, with an interval of 2−2,5 min.

The synthetic zeolite 5A (CAA), grain size of 0.25−0.5 mm.

The ethyl ether according to GOST 8981−78, H. h

The technical rectified ethyl alcohol according to GOST 18300−72.

Acetone according to GOST 2603−79, H. h. or h.d. a.

The aviation gasoline according to GOST 1012−72.

Carbon tetrachloride according to GOST 20288−74, H. h. or h.d. a.

Cotton calico.

Chromatographic column: stainless steel (4x0. 5; 6x1,0; 8x1,0, length 1.5−3.0 m).

Gauge type MT-60−0.16−0.25 MPa (1,6−2,5 ATM).

The throttle needle for fine adjustment of the type OH-6.

Microbes type CF-1 or any other type that allows you to weigh with an accuracy of 0.00001 g.

Pressure regulator RDF-31 or any other equivalent type capable of ensuring stable pressure in the pneumatic furnace lift in the range of 0.15−0.25 MPa (1.5 to 2.5 ATM).

The stopwatch according to GOST 5072−79.

Clip with a reading device of the type SRO-25 according to GOST 11098−75.

Capsule graphite brand S-2 or S-3 (DWG.4).

ГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водорода


Damn.4



Tape Plexiglas to capsules.

Stainless steel hook for cleaning the interior of the furnace chamber.

Flowmeter General RM according to GOST 13045−67*.
______________
* On the territory of the Russian Federation GOST 13045−81. — Note the manufacturer’s database.

Argon gas of high purity ballony according to GOST 10157−79.

Helium gas of high purity.

Standard samples of steel of SG-1 (N 81−71 in the state Register) steel SG-3 (N 577−74 on the state registry) steel SG-2 (N 416−73 on the state Register). Use standard samples category OSO, SOP, which certified the content of a component is not different from that analyzed more than two times.

3.2. Preparation for assay

Samples of tungsten metal pre-cleaned from oxide film, rinsed in gasoline or carbon tetrachloride and dried with acetone. Powder metal tungsten is used for the analysis without preliminary preparation.

For batches, take the pieces with the diameter from 2.0 to 2.8 mm, i.e. the pieces need to be sifting into the hole of 2.8 mm sieve and did not pass into the hole of 2.0 mm. sieve the Powder material is charged into the capsule using a small spatula.

Select the capsule in length with a tolerance of 0.05 mm (at the lever bracket) and degassed them at a temperature of about 3500 °C. For the analysis of samples taken capsules without cracks, the capsules with a small crack can be used for control experiments.

3.3. Analysis

Include chromatograph and set the optimum mode of chromatographically.

Set graphite capsule with the analyzed sample.

Depending on the mass fraction of nitrogen, hydrogen, oxygen in the sample take the sample in accordance with table.3.

Table 3

           
The name of the sample View sample Mass fraction of nitrogen, % The mass fraction of oxygen, %
Mass fraction of hydrogen in % The weight of the portion, %
Tungsten metallic Compact 0,001−0,01 0,001−0,01 0,0001−0,001

0,001−0,01
0,1−0,3
  Powder 0,01−0,1 0,01−0,1 0,01−0,1
0,05−0,1
    0,03−0,05 0,03−0,05 0,03−0,05
0,01−0,1



Slide the handle of the valve until it stops and at the same time include a stopwatch and starting the power button on the furnace.

30 with the handle the valve is returned to its original position and after the release of the hydrogen peak on the recorder switch knob «out of the accident» to the desired range for the designated item.

After 2 minutes replace the old capsule for a new one.

Note. Upon completion of the work, in order to avoid the ingress of air into the chromatograph, it should be «preserve», to do this, close the gearbox to the cylinder with argon gas for chromatograph. When the pressure of argon in both columns close to zero, establish a very weak flow of carrier gas in the device for the foam flowmeter and switch off the power button chromatograph.

3.4. Processing of the results

3.4.1. Mass fraction of nitrogen, hydrogen, oxygen (ГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водорода) in percent is calculated by the formula

ГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водорода,


where ГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водородаis the calibration coefficient, which is calculated for each of the element in the calibration of the instrument with standard samples;

ГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водородаthe peak height of the element minus the peak obtained in a control experiment, mm.

ГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водорода — weight of sample, mg.

The calibration factor should be checked and adjusted, especially after repair adjustments: change cylinders, supply and chromatograph oven for DNA analysis, and after a long inactivity of the installation.

3.4.2. Allowable absolute discrepancies in the results of parallel measurements at a confidence probability ГОСТ 14339.4-82 Вольфрам. Методы определения азота, кислорода, водородаof 0.95 does not exceed the values given in table.4.

Table 4

     
Mass fraction of detectable elements, %
Allowable absolute differences, % The designated element
From 0,0001 to 0,0003
0,00005 Hydrogen
SV. The 0.0003 «to 0.001 0,00008
Hydrogen, nitrogen, oxygen
«To 0.001» of 0.003
0,0001  
«Of 0.003» to 0.01
0,0005  
«Is 0.01» to 0.03
0,003  
«0,03» 0,1
0,005  

3.4.3. The method used in the disagreement in assessing the quality of tungsten.