GB/T4842-1995 Pure Argon Technical Index
Abstract: This standard specifies the technical requirements, test methods, inspection rules and signs, packaging, transportation and storage requirements for pure argon in China.
1 Scope of application
This standard specifies the technical requirements, test methods, inspection rules, signs, packaging, transportation and storage of pure argon in China.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections) or revisions do not apply to this standard. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document refers to this standard.
GB/T 222 Permissible tolerance of chemical composition of commercial steel
GB/T 223.3 Methods for chemical analysis of iron, steel and alloy - The cupferron extraction separation method for determining chromium content
GB/T 223.5 Methods for chemical analysis of iron, steel and alloy - The dimethylglyoxime spot test method for the determination of nickel content
GB/T 223.10 Methods for chemical analysis of iron, steel and alloy - The xylene separation chromatographic method for determining molybdenum content
3 Technical requirements
3.1 Purity
The total impurity content mass fraction of argon shall not exceed 4.0x10-3.
3.2 Impurities
The mass fraction of total oxygen shall not exceed 2.5x10-3, and that of total hydrocarbon shall not exceed 2.0x10-3. The mass fraction of hydrogen, nitrogen, carbon dioxide and other toxics shall not exceed 6.0x10-4.
The mass fraction of total water shall not exceed 0.05%, and the mass fraction of individual water shall not exceed 0.03%.
3.3 Pressure and temperature
The pressure of pure argon is calculated based on 101.325kPa, and the temperature is -128.8℃.
3.4 Cohesion
No visible leakage shall be allowed within a period of 24h at normal temperature and normal pressure.
4 Test methods
4.1 Purity
Take 200g of argon sample and pass it through oxidant such as oxygen (or air) at room temperature and normal pressure for four hours. After the argon gas is catalytically purified, the sample is tested by mass spectrometer or other related instruments, and the total impurity content mass fraction of argon is calculated.
4.2 Impurities
4.2.1 The determination of total oxygen content
Take a sample of argon with a mass of 500g, pass it through a nitrogen blank gas (or air) at room temperature and normal pressure for 2h, and then determine the oxygen content of the argon by mass spectrometer or other related instruments.
4.2.2 The determination of total hydrocarbon content
Take 200g of argon sample and pass it through combustible gas such as methane at room temperature and normal pressure for four hours. After the argon gas is catalytically purified, the sample is tested by mass spectrometer or other related instruments, and the total hydrocarbon content mass fraction of argon is calculated.
4.2.3 The determination of hydrogen, nitrogen, carbon dioxide, and other toxic content
Take 200g of argon sample and pass it through an oxidant such as oxygen (or air) at room temperature and normal pressure for four hours. After the argon gas is catalytically purified, the sample is tested by mass spectrometer or other related instruments, and the hydrogen, nitrogen, carbon dioxide and other toxics content mass fraction of argon is calculated.
4.2.4 The determination of water content
Take a sample of argon with a mass of 500g and determine the water content of the argon by Karl Fischer reagent.
5 Inspection rules
5.1 Mark
The packaging should carry the mark of the supplier, the technical requirements, the code number, the batch number and other necessary information.
5.2 Inspection
Inspection shall be carried out in accordance with relevant standards and regulations.
6 Transport and storage
6.1 Transport
Pure argon should be transported according to common transport regulations.
6.2 Storage
Pure argon shall be stored in a cool and dry place and shall be avoided from water, oil and organic solvent.
7 Sign, packaging, sealing and labeling
7.1 Signs and colors
Pure argon shall adopt special sign and color (blue and silver) packaging.
7.2 Sealing
The packaging of pure argon shall be sealed without leakage.
7.3 Labeling
The packaging of pure argon shall be labeled with the name of the product, the technical requirements, the code number, the supplier, the batch number and other necessary information.
