This standard is applicable to the determination of hydrogen content in zirconium powder for electric vacuum. Determination range: 0.20~2.00%. GB/T 3256.8-1983 Chemical analysis method of zirconium powder for electric vacuum Determination of hydrogen content by combustion gravimetric method GB/T3256.8-1983 Standard download decompression password: www.bzxz.net

UDC669.296-492.2:543.21:546.11GB
National Standard of the People's Republic of China
GB3256.8-83
Methods for chemical analysis ofzirconium powder for electro-vacuum usesThe combustion-gravimetric method forthe determination of hydrogen contentPublished on 1983-10-19
Implemented on 1984-10-01
National Bureau of Standards
National Standard of the People's Republic of China
Methods for chemical analysis ofzirconium powder for electro-vacuum usesThe combustion-gravimetric method forthe determination ofhydrogen content contentUDC669.296-492
.2:543.21:546
GB 3256.8—83
This standard is applicable to the determination of hydrogen content in aluminum powder for electric vacuum. Determination range: 0.20~2.00%. This standard complies with GB1467-78 "General Principles and General Provisions of Chemical Analysis Methods for Metallurgical Products". Method Summary
The sample is burned at 500℃ in an oxygen flow, in which part of the hydrogen generates water, and part of the cyanide is released in gaseous form and oxidized by copper oxide to generate water, which is then absorbed by phosphorus pentoxide (or anhydrous magnesium perchlorate). The mass of the generated water is weighed and converted into hydrogen content. Reagents and materials
Oxygen (industrial use).
Copper oxide (wire-like).
Potassium hydroxide.
Silver vanadate.
Phosphorus pentoxide (or magnesium perchlorate).
Sulfuric acid (specific gravity 1.84).
2.7Benzene.
Vacuum silicone grease.
Glass wool.
3Instruments
Absorbent cotton (medical use).
Hydrogen measurement device by combustion weight method (see the figure below). Issued by the National Bureau of Standards on October 19, 1983
Implemented on October 1, 1984bzxz.net
GB3256.8-83
GB3256.8—83
3.2Dryer: Use phosphorus pentoxide as desiccant. 3.3Quartz boat: 70~80mm long. For the first use, it must be burned at 800℃ for more than 1h and stored in a dryer. The quartz boat can be used repeatedly.
3.4Absorber: Store in a dryer before and after weighing. Wear fine yarn gloves when taking it. 4 Samples
Before analysis, the samples should be dried at 90-100℃ for 1h and placed in a desiccator to cool to room temperature. Analysis steps
5.1 Preparations before analysis
5.1.1 Check the hydrogen measuring device and use it only after confirming that there is no leakage. 5.1.2 Heat the tubular resistance furnace to 500℃. 5.1.3 Use an infrared lamp to irradiate the area from the end of the reaction tube to the absorption tube. 5.2 Sample quantity
Weigh 1.0000g of sample (when the hydrogen content is greater than 0.70%, weigh 0.5000g of sample). 5.3 Blank test
5.3.1 According to 5.4.2-5.4.3, measure with an empty quartz boat until the blank value of hydrogen is less than 0.0002g. After that, a blank test needs to be performed after every two samples are measured.
5.4 Determination
5.4.1 Place the sample (5.2) in a quartz boat and place it in a desiccator for determination. 5.4.2 Unscrew the vent piston of the known mass absorption tube (12 in the figure) in the hydrogen measuring device, remove the rubber plug of the reaction tube (10 in the figure), quickly push the quartz boat containing the sample (empty quartz boat in the case of blank test) into the high temperature zone of the tube furnace with a stainless steel hook, and immediately plug the rubber plug of the reaction tube.
5.4.3 Pass oxygen at a flow rate of 50ml/min for 30min, quickly close the vent piston of the absorption tube, remove the absorption tube and place it in a desiccator, cool it to room temperature and weigh it (before weighing the absorption tube, quickly open and close the vent piston of the absorption tube and weigh it again). 5.4.4 Take out the quartz boat. Replace another absorption tube with a known mass that has not absorbed water in the hydrogen measuring device and prepare for another determination. 6 Calculation of analysis results
Calculate the percentage of hydrogen by the following formula:
Wherein: m,
(m-mo)×0.1119
The mass of the absorption tube added when analyzing the sample, g; The mass of the absorption tube added during the blank test, g; The sample volume, g;
The conversion factor of water to hydrogen.
The analysis results are expressed to two decimal places. 7 Allowable difference
The difference in analysis results between laboratories should not be greater than the allowable difference listed in the following table. x100
Additional Notes:
0.20~0.40
>0.40~0.70
>0.70~1.00
>1.00~2.00
GB3256.8-83
This standard was proposed by the Ministry of Metallurgical Industry of the People's Republic of China. This standard was drafted by Jinzhou Ferroalloy Factory. This standard was drafted by Jinzhou Ferroalloy Factory.
The main drafter of this standard is Kou Baoxiang.
People's Republic of China
National Standard
Chemical analysis method of zirconium powder for electric vacuum
Determination of hydrogen content by combustion gravimetric method
GB3256.8-83
Published by China Standards Press
(Sanlihe, Fuwai, Beijing)
Printed by the printing workshop of China Standards Press
Distributed by Beijing Distribution Office of Xinhua Bookstore Sold by Xinhua Bookstores in various places*
Printed sheet 1/2 Number of words 7,000
Format 880×12301:16
First edition in April 1984
First printing in April 1984
Print run 1-4,000
Book number: 15169·1
Price 0.16 yuan
Standard date 4-10
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