Some standard content:
National Standard of the People's Republic of China
1 Subject content and scope of applicationwww.bzxz.net
GB/T 5828—1995
Replaces GB/T5828-86
GB/T 5830--86
This standard specifies the technical requirements, inspection methods, inspection rules, packaging, marking, transportation and storage of xenon. This standard applies to gaseous xenon extracted from air by cryogenic method. It is mainly used in the electric light source industry, and also in the fields of medical treatment, electric vacuum, laser, etc.
Xenon is an odorless, tasteless, inactive gas. Molecular formula: Xe
Relative molecular mass: 131.29 (according to the international relative atomic mass in 1991) 2 Reference standards
Dangerous goods packaging mark
GB5099
Seamless steel gas cylinders
GB/T5832.1 Determination of trace moisture in gas-Electrolytic method
GB7144 Color marking of gas cylinders
GB/T8985 Determination of total content of carbon monoxide, carbon dioxide and hydrocarbons in gasGB116404
Seamless aluminum alloy gas cylinders
3 Technical requirements
The quality of xenon gas shall meet the technical requirements of Table 1
Xenon purity, 102
Nitrogen content, 106
Oxygen and chlorine content, 10-6
Hydrogen content, 10°6
Total carbon content, 10-6
Water content, 10-6
Nitrogen content, 10-6
Nitrous oxide content, 10-6
Total impurity content, 10-6
High purity xenon
Gas chromatography
Note: ①The purity and content in the table are expressed in volume fraction (V/V). ②The moisture content of products packaged in glass bottles is not specified. Approved by the State Bureau of Technical Supervision on December 20, 1995, 99.995 qualified products. Implementation on August 1, 1996. GB/T 5828—1995. ③ The moisture content of gas cylinder packaging products refers to the moisture content when the pressure after filling is 5MPa. Whether to conduct inspection shall be determined by the supply and demand parties through negotiation. 4 Test method
4.1 Purity
The purity of xenon gas () is expressed in volume fraction and calculated according to formula (1): =100-(++++%++)×10-4
Wherein: Φ—xenon gas purity (volume fraction), 10-2; 9
Nitrogen content (volume fraction), 10-°,
Oxygen and fluorine content (volume fraction), 10-°, hydrogen content (volume fraction), 10-;
Total carbon content (volume fraction), 10-6; Water content (volume fraction), 10-\, 9%-—Nitrogen content (volume fraction), 10-6; Nitrous oxide content (volume fraction), 10-°. 4.2 Determination of hydrogen, oxygen (nitrogen), nitrogen and content 4.2.1 Method and principle
Nitrogen ionization gas chromatography is used.
This method is based on the principle of Penning effect. When the carrier gas nitrogen enters the detector, some nitrogen atoms are excited to the metastable state under the action of the beta rays radiated by the atmosphere source. After the sample gas is separated by the chromatographic column, it enters the detector together with the carrier gas. When the sample contains a component with an ionization energy lower than the excitation energy of the metastable nitrogen atom, the component will be ionized by inelastic collision with the metastable ammonia atom, and an ion flow will be formed under the action of the external electric field. Within a certain range, the output ion flow is proportional to the content of the component. 4.2.2 Instrument
A nitrogen ionization gas chromatograph with a positive and negative pressure sampling system is used. The instrument is required to have a detection limit of 50% lower than the content of the corresponding component specified in the standard for each component to be measured. The schematic diagram of the chromatographic flow is shown in Figure 1. 4.2.3 Reference operating conditions
4.2.3.1 Carrier gas: nitrogen, GB/T4844.3 flow rate is 50~60mL/min; 4.2.3.2 Operating gas: nitrogen, GB4844.2, first-class product, the main engine pressure indication value is about 0.3MPa. 4.2.3.3 Impurity gas: hydrogen, high-purity hydrogen in GB/T7445, the main engine pressure indication value is 0.05MPa, and the flow rate is 5~10mL/min. 4.2.3.4 Chromatographic column: 2m long, 4mm inner diameter stainless steel tube, filled with 0.4~0.25mm, 5A molecular sieve and activated carbon, volume ratio of about 3:1. Activated at 300℃ with nitrogen for 4h. 4.2.3.5 Chromatographic column temperature: room temperature.
4.2.3.6 Polarization voltage: 400~600V.
4.2.3.7 Recorder: Full scale 1~2mV. 4.2.3.8 Injection volume: about 1.5mL.
4.2.4 Provisions for standard mixed gas
The standard mixed gas uses nitrogen as the base gas, and the content of each component is close to the content of the component to be measured. The standard mixed gas should have a certification mark or number issued by the State Administration of Technical Supervision.
4.2.5 Operation steps
4.2.5.1 Turn on the instrument according to the instrument manual and operating conditions until it is stable. Check the air tightness. 4.2.5.2 Tightly connect the standard mixed gas to the instrument through the needle valve and metal pipe. Open the bottle valve, adjust the flow rate with the needle valve, and fully set the sampling system. Inject through valve 17. Measure the peak area A of each component. 47
Nitrogen cleaning gas
Hydrogen port impurity
GB/T 5828-1995
Zhengle sample or
Standard gas inlet
Fluorine carrier gas inlet
Nitrogen carrier gas inlet
Figure 1 Schematic diagram of gas chromatography process
Hydrogen inlet
Air inlet
15A molecular sieve + activated carbon column; 2--PorapakQ column; 3-5A molecular sieve column; 4-eight-way switching valve; 5, 8, 10-needle valve; 6-nitrogen ionization detector; 7-hydrogen permeation chamber; 9-twelve-way switching valve 11-mercury differential pressure gauge; 12 , 13, 14, 19—high vacuum two-way valve; 15, 16, 23—high vacuum three-way valve; 17, 20 high vacuum six-way valve; 18, 21—constant volume tube; 22—vacuum pump; 24—standard ground joint; 25—sample gas packaged in glass bottle; 26—catalytic hydrogenation column; 27—heating furnace, 28 carbon molecular sieve column; 29—hydrogen flame ionization detector
4.2.5.3 Determination of samples
4.2.5.3.1 Determination of xenon gas packaged in gas cylinder: Sampling and injection operations are the same as 4.2.5.2. After the last component to be measured has finished emitting peaks, switch valve 9 to cut out the main component xenon. Measure the peak area Ai of each component. 4.2.5.3.2 Determination of xenon gas packaged in glass bottle: Connect the sample gas tightly to valve 13 through the standard ground joint 24. Evacuate the entire negative pressure sampling system, perform vacuum injection blank until the blank value is zero, and then break the bottle. Close valve 13, open valve 14, and evacuate again. Close valve 14, open valve 13, and after the mercury differential pressure gauge 11 is stable, close valve 13, read and record the reading P2 of the differential pressure gauge 11 and the indoor atmospheric pressure P1 during sampling. Inject through valve 17. After the last component to be measured has finished emitting a peak, switch valve 9 to cut out the main component xenon. Measure the peak area A of each component. 4.2.6 Result processing
4.2.6.1 The content of the component to be measured is calculated according to formula (2): 9#X
Wherein: i-
The content of component i in the sample gas, 10-6 (V/V); A
Pi—P2
The content of component i in the standard mixed gas, 10-, (V/V); A—The peak area of component i in the sample gas, mm; A,The peak area of component i in the standard mixed gas, mm; Pi-—The atmospheric pressure of the laboratory, kPa;
P-The difference between the atmospheric pressure and the sample gas pressure when sampling, kPa. 4.2.6.2 The arithmetic mean of the results of two parallel determinations is taken as the determination result. The relative deviation of the parallel determination results shall not exceed 10%. 4.3 Determination of nitrous oxide content
4.3.1 Chromatographic column 2: Use a stainless steel tube with a length of 3m and an inner diameter of 4mm, filled with 0.15~~0.10mm PorapakQ, activate with nitrogen at 130℃ for 4h, and then increase the temperature to 200℃ for activation for 8h. 417
4.3.2 Operation steps
GB/T 5828—1995
Switch valve 9 and connect chromatographic column 2 to the chromatographic system. The rest of the operations are the same as 4.2.4.4 Determination of total carbon content
Inspect according to the provisions of GB/T8985
4.4.1 Instrument Use a hydrogen flame ionization gas chromatograph with a positive and negative pressure sampling system. The instrument is required to have a detection limit of no more than 0.2×10-6 (V/V) for each component to be measured. The schematic diagram of the chromatographic flow is shown in Figure 1. The operation steps in 4.4.2 are the same as those in 4.2.5 except that the switching operation is not performed and the sample is injected using valve 20. 4.5 Determination of moisture content
Inspection shall be carried out in accordance with the provisions of GB/T5832.1. 5 Inspection rules
5.1 Xenon gas shall be inspected and accepted by the quality supervision department of the manufacturer in accordance with the provisions of this standard, and shall ensure that all products leaving the factory meet the requirements of this standard.
5.2 Gas packed in gas cylinders shall be inspected bottle by bottle. If any of the inspection results do not meet the requirements of this standard, the bottle product shall be unqualified. 5.3 Xenon gas packed in glass bottles shall be inspected in batches, and the batch submitted for inspection shall consist of products filled once. One bottle shall be randomly selected from each batch of products for inspection. If any of the inspection results do not meet the requirements of this standard, two bottles shall be randomly selected from the same batch of products for inspection. If the inspection results still do not meet the requirements of this standard, the batch of products shall be unqualified. 5.4 Users have the right to inspect and accept in accordance with the provisions of this standard. 5.5 When the supply and demand parties have objections to the quality of the product, they may jointly inspect or apply for arbitration. 6 Packaging, marking, storage and transportation
6.1 Gas cylinder packaging
6.1.1 The pressure of the gas cylinder packaging shall be filled according to the user's needs, but shall not exceed 5.5MPa at 20℃. The pressure gauge for measuring pressure shall not be lower than Class 1.5.
The amount of gas in the gas cylinder shall be determined by weighing. The ratio of the maximum weighing capacity to the sensitivity of the balance shall be better than 105. The volume of the gas shall be calculated according to formula (3):
Where: V---
The volume of xenon gas (101.3kPa, 20℃), m; the sum of the mass of the gas cylinder and the mass of the gas, kg; the mass of the gas cylinder, kg;
p---The density of nitrogen at 101.3kPa, 20℃, its value is 5.49kg/m. (3)
6.1.2 The packaging, marking, storage and transportation of gas cylinders shall comply with the provisions of the "Gas Cylinder Safety Supervision Regulations", GB190, GB5099, GB7144 and GB11640.
6.1.3 The residual pressure in the gas cylinders returned from the user shall not be less than 0.05MPa. 6.1.4 New cylinders, cylinders that have been repaired or hydrostatically tested, and cylinders that are contaminated without residual pressure shall be heated and evacuated. 6.2 Glass bottle packaging
6.2.1 The filling pressure of xenon gas packaged in glass bottles shall not be less than 86.6kPa. The volume of the glass bottle shall be calibrated. The volume of the gas is calculated according to formula (1):
(4)
GB/T 5828—1995
Volume of xenon gas (101.3 kPa, 20°C), L; where: -
Standard atmospheric pressure (101.3 kPa);
Vi——Volume of glass bottle, L;
Pressure of filling gas, kPa;
Actual temperature of gas, K.
6.2.2 Glass bottles for packaging xenon gas should be packed in cardboard boxes or calcium plastic boxes, and the boxes should be marked with the words and logos of "fragile, shockproof". 6.3 The product should be accompanied by a product quality certificate when leaving the factory, and its contents include: a.
Manufacturer name;
Product name and grade;
Production date or batch number;
Container volume (L), cylinder pressure (MPa) and gas quantity (m\), cylinder number and mass (kg);
Implementation standard code.
Additional instructions:
This standard is proposed by the Ministry of Chemical Industry.
This standard is under the technical management of Southwest Chemical Research Institute. This standard is drafted by Southwest Chemical Research Institute, Fushun Oxygen Plant, and Jilin Chemical Company Fertilizer Plant. The main drafter of this standard is Dai Peishu.
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.