Some standard content:
621.039.5:543.06
National Standard of the People's Republic of China
GB/T14501.6--94
Determination of uranium in
uraniumhexafluoride
Issued on September 24, 1994
State Bureau of Technical Supervision
Implementation on August 1, 1995
National Standard of the People's Republic of China
Determination of uranium in
uranium hexafluoride
1 Subject content and scope of application
This standard specifies the main operating conditions and steps for the determination of uranium in uranium hexafluoride. GB/T14501.6—94
Replaces GB/T10270—88
This standard applies to the determination of uranium in uranium hexafluoride, and is also applicable to the precise determination of uranium in standard and high-purity uranium compounds. Part I Analysis of Uranium by Gravimetric Method
2 Summary of Method
The uranium hexafluoride sample (8-12g) obtained by liquefaction is frozen with liquid nitrogen, hydrolyzed, and the hydrolyzate (uranyl fluoride solution) is evaporated. Then it is converted into uranium trioxide octoxide by high-temperature hydrolysis. The uranium content in uranium hexafluoride is calculated from the mass of uranium trioxide obtained and the mass factor measured by potentiometric titration. When necessary, the non-volatile impurity content given is corrected. 3 Reagents and Instruments
3.1 Deionized water.
3.2 Nitric Acid Solution (1+1).
3.3 High temperature hydrolysis furnace, 3kW muffle furnace, lined with 2mm nickel sheet (200mm×115mm×75mm), connected to steam generator and condenser.
3.4 Platinum boat with platinum cover, 100mL.
3.5 Platinum ferrule pliers.
3.6 Polytetrafluoroethylene rod.
Tweezers, 100mm long, fluoroplastic ferrule.
3.8 Infrared lamp.
3.9 Analytical balance, maximum load 200g, sensitivity 0.1mg. 3.10 Wrench (for opening sample tube cover). 3.11 Dewar flask.
Bench vise, used to fix the sample tube so that the sample tube can be opened with a wrench. 4 Operation steps
4.1 Preparation of platinum boat
4.1.1 Place the platinum boat (3.4) in a nitric acid solution (3.2) and boil for 10 minutes, then rinse with deionized water (3.1). 4.1.2 Place the platinum boat in a high-temperature hydrolysis furnace (3.3) and calcine at 900°C for 20 minutes. 4.1.3 After the calcination, cool the platinum boat in a dryer for 40 minutes and weigh it (accurate to 0.1 mg). Approved by the State Administration of Technical Supervision on September 24, 1994, implemented on August 1, 1995
GB/T14501.6—94
4.1. Weigh again after 45 minutes. If the difference between the two consecutive weighing results is less than 0.2 mg, record the second result. Otherwise, repeat the weighing until the difference between the two weighing results is less than 0.2 mg. 4.2 Hydrolysis, evaporation and burning of samples
4.2.1 Check the uranium hexafluoride sample. If the sample is yellow, it means that the sample is damp and cannot be used. 4.2.2 Place the sample tube containing uranium hexafluoride in a fume hood and let it stand. Wipe the moisture and attachments on the surface with gauze and place it in a desiccator overnight.
4.2.3 Weigh the sample tube to an accuracy of 0.1 mg, once every 30 minutes, until the difference between two consecutive weighing results is less than 0.2 mg. 4.2.4 Freeze the sample tube in liquid nitrogen for 10 minutes. 4.2.5 Quickly put the frozen sample tube in a vise (3.12) and loosen the nut with a wrench (3.10). 4.2.6 Remove the nut and gland, and quickly place the sample tube and the gasket sideways into the constant weight platinum boat. 4.2.7 Immediately inject about 75 mL of deionized water cooled to about 4°C to cover the sample tube. 4.2.8 Use tweezers (3.7) to remove the gasket to allow water to enter the tube, rinse the tweezers with deionized water, and collect the solution in a platinum boat. 4.2.9 After the hydrolysis reaction is completed, use a polytetrafluoroethylene rod (3.6) or tweezers (3.7) to carefully remove the sample tube and gasket, rinse with deionized water, and collect the washing solution in a platinum boat. Avoid splashing of the solution during the operation. 4.2.10 Place the cleaned sample tube and gasket in an oven and bake at 110°C for at least 2 hours. 4.2.11 After taking it out, put it into a desiccator together with the nut and gland. After 2 hours, take it out and weigh it to an accuracy of 0.1 mg to obtain the tare weight of the sample tube. 4.2.12 Evaporate the fluorinated acid solution in the platinum boat under an infrared lamp (3.8). Especially in the later stage, the temperature should be strictly controlled to prevent the solution from splashing. 4.2.13 Cover the platinum boat with a platinum cover (leaving a small gap), place it in the high-temperature hydrolysis furnace (3.3) and burn it to convert uranyl fluoride into uranium trioxide. Let 1L/h of steam flow into the furnace, burn it at 900℃ for 30min, stop the ventilation and burn it for another 15min. 4.2.14 Take out the platinum boat, put it in a dryer and cool it for 40min, then weigh it to an accuracy of 0.1mg. Weigh it again every 5min until the difference between the two adjacent weighing results is within 0.3mg. 4.2.15 Take a portion of uranium trioxide in a small glass bottle for impurity analysis, for use in impurity correction. 5 Result Expression
5.1 Calculate the percentage of uranium in antimony hexafluoride according to formula (1). AXmz×100
% content (%) -
Where: A - mass factor, that is, the number of grams of uranium contained in each gram of weighed uranium trioxide. Its value changes with the isotopic composition. The calculation of its stoichiometric value is shown in Section 5.2. Generally, the calculated value is slightly higher than the measured value. For accurate determination, it should be measured by potentiometric titration (see Part II):
The actual mass of uranium trioxide after impurity correction, name. If the same uranium trioxide (without m
impurity correction) is used when determining the mass factor, no impurity correction is required. The mass conversion factor of impurities is shown in Appendix A (Supplement): mi - the amount of uranium hexafluoride sampled in g.
5.2 Calculation of mass factor A
3Ar(U)
A=3Ar(U)+8Ar(O)
Where: Ar(O)—-15.9994 (relative atomic weight of oxygen); Ar(U)—average relative atomic weight of uranium, calculated by formula (3) or formula (4). Ar(U)=
234.0409+
Where: m234, m235, m236>mzaa are the mass fractions of various clamp isotopes respectively. 2
·（2）
GB/T14501.6-94
Ar(U)=238.0508×(1-M294M236-M235)+234.0409×M234+236.0456XM236+235.0439XM235 Where: M234, M235, M23 are the atomic fractions of various uranium isotopes. (4))
5.3 Taking into account the influence of cold air on the surface of the uranium hexafluoride sampling tube and the influence of air buoyancy when weighing the sample, if the sampling amount is less than 8g, the calculated uranium content in uranium hexafluoride should be corrected according to Appendix B (Supplement). When the sampling amount is 812g, the above two effects offset each other and the correction value can be ignored.
6 Precision
6.1 In-house precision shall not exceed 0.04%.
6.2 Inter-laboratory precision shall not exceed 0.05%.
Part II Potentiometric Titration Analysis of Uranium
7 Summary of Method
Uranium hexafluoride is hydrolyzed, evaporated and calcined to obtain triuranium octoxide. Triuranium octoxide is dissolved in phosphoric acid-hydrofluoric acid, and ferrous sulfate is used to reduce uranium (I). Excess ferrous iron is oxidized with nitric acid catalyzed by molybdenum (V), and aminosulfonic acid is added to remove nitrogen oxides generated during the oxidation process. In the presence of vanadium (IV), potassium dichromate is used as an oxidant to determine uranium by potentiometric titration. The measured quality factor (see Part I) can also be calculated from the measured uranium amount, and the uranium content in uranium hexafluoride can be calculated from this. 8 Reagents
All reagents are analytical grade unless otherwise specified and are prepared with distilled or deionized water. 8.1 Potassium dichromate: reference reagent. Bake to constant weight at 120-130℃ before use. 8.2 Vanadyl sulfate (VOSO,·2H,O) solid. 8.3 Nitric acid: 65%~68%.
8.4 Hydrofluoric acid: 48%.
8.5 Phosphoric acid: 85%.
8.6 Sulfuric acid: 8mol/L.
Ferrous sulfate solution: 1mol/L. The solution should not be used for more than two weeks after preparation. 8.8 Aminosulfonic acid solution: 1.5mol/L. Dissolve 150g aminosulfonic acid in 1L water. 8.9 Nitric acid-aminosulfonic acid-ammonium molybdate mixture: Dissolve 4.0g ammonium molybdate [(NH).Mo,O2·4H,O7] in 400mL water, add 500mL nitric acid (8.3) and 100mL aminosulfonic acid solution (8.8), and mix well. The solution should not be used for more than two weeks after preparation. 8.10 Potassium dichromate solution: 0.60000g/L prepared from the standard reagent (8.1), weighed to 0.02mg. 9 Instruments
9.1 Analytical balance: Analytical balance with a sensitivity of 0.1mg and 0.01mg, calibrated. 9.2 pH meter: Minimum scale value is 1mV.
9.3 Platinum electrode: Surface area 0.1~1cm2. When the titration reaches the end point, if the electrode response becomes poor, the electrode can be immersed in boiling nitric acid (8.3) containing a small amount of potassium dichromate to clean it, and then rinse it with deionized water. 9.4 Calomel reference electrode.
9.5 Electromagnetic stirrer, using polyethylene sealed stirrer, iron core length 30mm, diameter 4mm. 9.6 Burette: 10mL, minimum graduation value 0.05mL: volume corrected. 10
Operation steps
Prepare the uranium octoxide sample according to steps 4.1 to 4.2. 3
GB/T14501.6—94
10.2 Weigh about 2g of the sample, accurate to 0.02mg, and put it into a 300mL tall beaker. If necessary, buoyancy correction should be performed. 10.3 Add 50mL phosphoric acid (8.5), 1mL hydrofluoric acid (8.4), and 1mL potassium dichromate solution (8.10), and carefully heat to near boiling to dissolve the sample completely (a white background can be placed at the bottom of the cup for observation). 10.4 Cool the solution, wash the beaker wall with 30mL water, stir well, and then wash the stirring rod with 20mL water. Spread the beaker and evaporate it in a boiling water bath for 8h. 10.5 Add the calculated amount of ferrous sulfate solution (8.7) (the calculated volume (mL) of ferrous sulfate is equivalent to 4.7 times the number of grams of uranium octoxide). Mix well. Cover with a watch glass and place it in a boiling water bath for 1h, then cool to about 27℃. 10.6 Move the beaker to an electromagnetic stirrer. The following steps should be carried out continuously unless otherwise specified. Add 5mL sulfuric acid (8.6), 5mL aminosulfonic acid solution (8.8), and 2mL ferrous sulfate solution (8.7) in sequence while stirring. Mix for 1~2min. 10.7 Add a thermometer, adjust the temperature to 35℃, wash the beaker wall with 10mL nitric acid-aminosulfonic acid-ammonium molybdate mixture (8.9), stir for 2.5min, and let stand for 0.5min. Wash the thermometer and the beaker with 90 mL of water and remove the thermometer. Note: After adding the mixed solution, the solution turns brown and this color usually disappears within 10 seconds. 10.8 Add the pre-weighed standard potassium dichromate (8.1) 4 to 5 mg less than the calculated amount required for oxidation of tetravalent uranium, and weigh to 0.02 mg (corrected for buoyancy). Wash the container containing solid potassium dichromate with 10 mL of water and add the washing liquid to the beaker. 10.9 Add 100 to 125 mg of solid vanadium sulfate (8.2). 10.10 Insert the platinum electrode (9.3) and the calomel electrode (9.4), and drip the potassium dichromate solution (8.10) from the 10 mL burette (9.6) to a potential of about 480 mV. Then read the potential value after stabilization (the potential change does not exceed 1 mV within 5 seconds) after adding 0.10 mL of titrant each time until it passes the jump point.
Note: 10.8~10.10 must be completed within 7 minutes after the addition of 90 mL of water. 10.11 Use the second-order difference method to calculate the volume of potassium dichromate consumed in the titration to the endpoint, and add the amount of potassium dichromate contained in this volume to the amount of solid potassium dichromate.
11 Calculation results
11.1 Example for calculating the volume of potassium dichromate consumed in titration to the endpoint: Volume, mL
Potential, mV
Titration volume V (mL) = 6.10 + o.1[143/(143+132)) = 6.15211.2 Calculate the amount of uranium in the sample;
ms = (D+Te)/F
Where: ms the amount of uranium in the uranium octoxide sample taken, g; Amount of solid potassium dichromate added·g:
T the volume of potassium dichromate titrant consumed, mL: - concentration of potassium dichromate titrant, g/mL; F - calculation factor, its value is (molecular weight of potassium dichromate/6)/(atomic weight of uranium/2). 4
（5）
GB/T14501.6—94
For natural uranium, the F value is equal to 0.41198. For non-natural uranium, the average atomic weight of uranium is calculated according to the clamp isotopic composition according to formula (3) 11.3 Calculate the mass factor A:
A=ms/m
The amount of uranium in a sample of trisodium octoxide; where: ma
The amount of triuranium octoxide taken, g.
11.4 Use the mass factor A to calculate the percentage of uranium in hexafluoride (see the first article). 12 Precision
The indoor precision is 0.039%.
Inter-laboratory precision is 0.051%
Rare earth elements
GB/T14501.6-94
Appendix A
Mass conversion factors for non-volatile impurities
(Supplement)
Possible states of impurities
Conversion factors
Note: The values listed in this table are based on the best available data and take into account the effects of burning, cooling and uranium oxide matrix. In view of the fact that the final chemical state cannot be completely determined, in order to ensure the precision of the method, the total content of non-volatile impurities should be less than 0.1%. UFa-g
Additional Notes:
GB/T14501-6—94
Appendix B
Correction of Calculated Values of Uranium Hexafluoride Content
(Supplement)
Correction Values to be Added for Platinum Content
This standard was proposed by China National Nuclear Corporation. This standard was drafted by the Nuclear Industry Standardization Institute. UFog
Correction Values to be Added for Content
The main drafters of this standard are Qiu Xiaoxi, Ding Baoliang and Guan Jingsu. This standard is equivalent to Chapter 1125 of ASTM C 761-88 "Chemical, Mass Spectrometric, Spectroscopic, Nuclear and Radiochemical Analysis of Uranium Hexafluoride" of the United States.
(Beijing) Xindengzi No. 023
People's Republic of China
National Standard
Determination of Uranium in Uranium Hexafluoride
GB/T14501.6-94
Published by China Standards Press
No. 16, Sanxing Hebei Street, Fuxingmenwai, Beijing
Postal Code: 100045
Tel: 8522112
Printed by Taihuangdao Printing Factory, China Standards Press Distributed by Xinhua Bookstore Beijing Distribution Office Sold by Xinhua Bookstores in various places. Copyright reserved. No reproduction allowed. Format: 880×12301/16. First edition in June 1995. Printing sheet: 3/4. Word count: 14,000. First printing in June 1995. Print run: 1-1000. Book number: 155066·1-11474. Heading: 264-26.5 Add the calculated amount of ferrous sulfate solution (8.7) (the calculated volume of ferrous sulfate (mL) is equivalent to 4.7 times the number of grams of triuranium octoxide). Mix well. Cover with a watch glass and place in a boiling water bath for 1 hour, then cool to about 27°C. 10.6 Move the beaker to an electromagnetic stirrer. The following steps should be performed continuously unless otherwise specified. Add 5 mL of sulfuric acid (8.6), 5 mL of aminosulfonic acid solution (8.8), and 2 mL of ferrous sulfate solution (8.7) in sequence while stirring. Mix for 1~2 minutes. 10.7 Add a thermometer, adjust the temperature to 35°C, wash the wall of the cup with 10 mL of nitric acid-aminosulfonic acid-ammonium molybdate mixture (8.9), stir for 2.5 minutes, and let stand for 0.5 minutes. Wash the thermometer and the wall of the cup with 90 mL of water and remove the thermometer. Note: After adding the mixture, the solution turns brown, and this color usually disappears within 10 seconds. 10.8 Add pre-weighed potassium dichromate (8.1) 4-5 mg less than the calculated amount required for oxidation of tetravalent uranium, accurate to 0.02 mg (corrected for buoyancy). Wash the container containing solid potassium dichromate with 10 mL of water, and add the washings to the beaker. 10.9 Add 100-125 mg of solid vanadium sulfate (8.2). 10.10 Insert the platinum electrode (9.3) and the calomel electrode (9.4), and drip potassium dichromate solution (8.10) from the 10 mL burette (9.6) to a potential of about 480 mV. Then read the potential value after stabilization (potential change does not exceed 1 mV within 5 s) after each 0.10 mL of titrant is added until the potential passes the jump point.
Note: 10.8-10.10 must be completed within 7 minutes after the addition of 90 mL of water. 10.11 Use the second-order difference method to calculate the volume of potassium dichromate consumed in the titration to the endpoint, and add the amount of potassium dichromate contained in this volume to the amount of solid potassium dichromate.
11 Calculation results
11.1 Example for calculating the volume of potassium dichromate consumed in titration to the endpoint: Volume, mL
Potential, mV
Titration volume V (mL) = 6.10 + o.1[143/(143+132)) = 6.15211.2 Calculate the amount of uranium in the sample;
ms = (D+Te)/F
Where: ms the amount of uranium in the uranium octoxide sample taken, g; Amount of solid potassium dichromate added·g:
T the volume of potassium dichromate titrant consumed, mL: - concentration of potassium dichromate titrant, g/mL; F - calculation factor, its value is (molecular weight of potassium dichromate/6)/(atomic weight of uranium/2). 4
（5）
GB/T14501.6—94
For natural uranium, the F value is equal to 0.41198. For non-natural uranium, the average atomic weight of uranium is calculated according to the clamp isotopic composition according to formula (3) 11.3 Calculate the mass factor A:
A=ms/m
The amount of uranium in a sample of trisodium octoxide; where: ma
The amount of triuranium octoxide taken, g.
11.4 Use the mass factor A to calculate the percentage of uranium in hexafluoride (see the first article). 12 Precision
The indoor precision is 0.039%.
Inter-laboratory precision is 0.051%
Rare earth elements
GB/T14501.6-94
Appendix A
Mass conversion factors for non-volatile impurities
(Supplement)
Possible states of impurities
Conversion factors
Note: The values listed in this table are based on the best available data and take into account the effects of burning, cooling and uranium oxide matrix. In view of the fact that the final chemical state cannot be completely determined, in order to ensure the precision of the method, the total content of non-volatile impurities should be less than 0.1%. UFa-g
Additional Notes:
GB/T14501-6—94
Appendix B
Correction of Calculated Values of Uranium Hexafluoride Content
(Supplement)
Correction Values to be Added for Platinum Content
This standard was proposed by China National Nuclear Corporation. This standard was drafted by the Nuclear Industry Standardization Institute. UFog
Correction Values to be Added for Content
The main drafters of this standard are Qiu Xiaoxi, Ding Baoliang and Guan Jingsu. This standard is equivalent to Chapter 1125 of ASTM C 761-88 "Chemical, Mass Spectrometric, Spectroscopic, Nuclear and Radiochemical Analysis of Uranium Hexafluoride" of the United States.
(Beijing) Xindengzi No. 023
People's Republic of China
National Standard
Determination of Uranium in Uranium Hexafluoride
GB/T14501.6-94
Published by China Standards Press
No. 16, Sanxing Hebei Street, Fuxingmenwai, Beijing
Postal Code: 100045
Tel: 8522112
Printed by Taihuangdao Printing Factory, China Standards Press Distributed by Xinhua Bookstore Beijing Distribution Office Sold by Xinhua Bookstores in various places. Copyright reserved. No reproduction allowed. Format: 880×12301/16. First edition in June 1995. Printing sheet: 3/4. Word count: 14,000. First printing in June 1995. Print run: 1-1000. Book number: 155066·1-11474. Heading: 264-26.5 Add the calculated amount of ferrous sulfate solution (8.7) (the calculated volume of ferrous sulfate (mL) is equivalent to 4.7 times the number of grams of triuranium octoxide). Mix well. Cover with a watch glass and place in a boiling water bath for 1 hour, then cool to about 27°C. 10.6 Move the beaker to an electromagnetic stirrer. The following steps should be performed continuously unless otherwise specified. Add 5 mL of sulfuric acid (8.6), 5 mL of aminosulfonic acid solution (8.8), and 2 mL of ferrous sulfate solution (8.7) in sequence while stirring. Mix for 1~2 minutes. 10.7 Add a thermometer, adjust the temperature to 35°C, wash the wall of the cup with 10 mL of nitric acid-aminosulfonic acid-ammonium molybdate mixture (8.9), stir for 2.5 minutes, and let stand for 0.5 minutes. Wash the thermometer and the wall of the cup with 90 mL of water and remove the thermometer. Note: After adding the mixture, the solution turns brown, and this color usually disappears within 10 seconds. 10.8 Add pre-weighed potassium dichromate (8.1) 4-5 mg less than the calculated amount required for oxidation of tetravalent uranium, accurate to 0.02 mg (corrected for buoyancy). Wash the container containing solid potassium dichromate with 10 mL of water, and add the washings to the beaker. 10.9 Add 100-125 mg of solid vanadium sulfate (8.2). 10.10 Insert the platinum electrode (9.3) and the calomel electrode (9.4), and drip potassium dichromate solution (8.10) from the 10 mL burette (9.6) to a potential of about 480 mV. Then read the potential value after stabilization (potential change does not exceed 1 mV within 5 s) after each 0.10 mL of titrant is added until the potential passes the jump point.
Note: 10.8-10.10 must be completed within 7 minutes after the addition of 90 mL of water. 10.11 Use the second-order difference method to calculate the volume of potassium dichromate consumed in the titration to the endpoint, and add the amount of potassium dichromate contained in this volume to the amount of solid potassium dichromate.
11 Calculation results
11.1 Example for calculating the volume of potassium dichromate consumed in titration to the endpoint: Volume, mL
Potential, mV
Titration volume V (mL) = 6.10 + o.1[143/(143+132)) = 6.15211.2 Calculate the amount of uranium in the sample;
ms = (D+Te)/F
Where: ms the amount of uranium in the uranium octoxide sample taken, g; Amount of solid potassium dichromate added·g:
T the volume of potassium dichromate titrant consumed, mL: - concentration of potassium dichromate titrant, g/mL; F - calculation factor, its value is (molecular weight of potassium dichromate/6)/(atomic weight of uranium/2). 4
（5）
GB/T14501.6—94
For natural uranium, the F value is equal to 0.41198. For non-natural uranium, the average atomic weight of uranium is calculated according to the clamp isotopic composition according to formula (3) 11.3 Calculate the mass factor A:
A=ms/m
The amount of uranium in a sample of trisodium octoxide; where: ma
The amount of triuranium octoxide taken, g. wwW.bzxz.Net
11.4 Use the mass factor A to calculate the percentage of uranium in hexafluoride (see the first article). 12 Precision
The indoor precision is 0.039%.
Inter-laboratory precision is 0.051%
Rare earth elements
GB/T14501.6-94
Appendix A
Mass conversion factors for non-volatile impurities
(Supplement)
Possible states of impurities
Conversion factors
Note: The values listed in this table are based on the best available data and take into account the effects of burning, cooling and uranium oxide matrix. In view of the fact that the final chemical state cannot be completely determined, in order to ensure the precision of the method, the total content of non-volatile impurities should be less than 0.1%. UFa-g
Additional Notes:
GB/T14501-6—94
Appendix B
Correction of Calculated Values of Uranium Hexafluoride Content
(Supplement)
Correction Values to be Added for Platinum Content
This standard was proposed by China National Nuclear Corporation. This standard was drafted by the Nuclear Industry Standardization Institute. UFog
Correction Values to be Added for Content
The main drafters of this standard are Qiu Xiaoxi, Ding Baoliang and Guan Jingsu. This standard is equivalent to Chapter 1125 of ASTM C 761-88 "Chemical, Mass Spectrometric, Spectroscopic, Nuclear and Radiochemical Analysis of Uranium Hexafluoride" of the United States.
(Beijing) Xindengzi No. 023
People's Republic of China
National Standard
Determination of Uranium in Uranium Hexafluoride
GB/T14501.6-94
Published by China Standards Press
No. 16, Sanxing Hebei Street, Fuxingmenwai, Beijing
Postal Code: 100045
Tel: 8522112
Printed by Taihuangdao Printing Factory, China Standards Press Distributed by Xinhua Bookstore Beijing Distribution Office Sold by Xinhua Bookstores in various places. Copyright reserved. No reproduction allowed. Format: 880×12301/16. First edition in June 1995. Printing sheet: 3/4. Word count: 14,000. First printing in June 1995. Print run: 1-1000. Book number: 155066·1-11474. Heading: 264-26.6-94
Appendix A
Mass conversion factors for non-volatile impurities
(Supplement)
Possible states of impurities
Conversion factors
Note: The values listed in this table are based on the best available data and take into account the effects of burning, cooling and oxidation of the uranium matrix. In view of the fact that the final chemical state cannot be completely determined, in order to ensure the precision of the method, the total content of non-volatile impurities should be less than 0.1%. UFa-g
Additional notes:
GB/T14501-6—94
Appendix B
Correction of calculated values of uranium hexafluoride content
(Supplement)
Correction value to be added to platinum content
This standard was proposed by China National Nuclear Corporation. This standard was drafted by the Nuclear Industry Standardization Institute. UFog
Correction value to be added to the content
The main drafters of this standard are Qiu Xiaoxi, Ding Baoliang and Guan Jingsu. This standard is equivalent to Chapter 1125 of ASTM C 761-88 "Chemical, mass spectrometric, spectral, nuclear and radiochemical analysis of uranium hexafluoride" in the United States.
(Beijing) Xindengzi No. 023
National Standard of the People's Republic of China
Determination of uranium in uranium hexafluoride
GB/T14501.6-94
Published by China Standards Press
No. 16, Sanxinghebei Street, Fuxingmenwai, Beijing
Postal Code: 100045
Tel: 8522112
Printed by Taihuangdao Printing Factory of China Standards Press Distributed by Xinhua Bookstore Beijing Distribution Office Sold by Xinhua Bookstores in various places. Copyright reserved. No reproduction allowed. Format: 880×12301/16. First edition in June 1995. Printing sheet: 3/4. Word count: 14,000. First printing in June 1995. Print run: 1-1000. Book number: 155066·1-11474. Heading: 264-26.6-94
Appendix A
Mass conversion factors for non-volatile impurities
(Supplement)
Possible states of impurities
Conversion factors
Note: The values listed in this table are based on the best available data and take into account the effects of burning, cooling and oxidation of the uranium matrix. In view of the fact that the final chemical state cannot be completely determined, in order to ensure the precision of the method, the total content of non-volatile impurities should be less than 0.1%. UFa-g
Additional notes:
GB/T14501-6—94
Appendix B
Correction of calculated values of uranium hexafluoride content
(Supplement)
Correction value to be added to platinum content
This standard was proposed by China National Nuclear Corporation. This standard was drafted by the Nuclear Industry Standardization Institute. UFog
Correction value to be added to the content
The main drafters of this standard are Qiu Xiaoxi, Ding Baoliang and Guan Jingsu. This standard is equivalent to Chapter 1125 of ASTM C 761-88 "Chemical, mass spectrometric, spectral, nuclear and radiochemical analysis of uranium hexafluoride" in the United States.
(Beijing) Xindengzi No. 023
National Standard of the People's Republic of China
Determination of uranium in uranium hexafluoride
GB/T14501.6-94
Published by China Standards Press
No. 16, Sanxinghebei Street, Fuxingmenwai, Beijing
Postal Code: 100045
Tel: 8522112
Printed by Taihuangdao Printing Factory of China Standards Press Distributed by Xinhua Bookstore Beijing Distribution Office Sold by Xinhua Bookstores in various places. Copyright reserved. No reproduction allowed. Format: 880×12301/16. First edition in June 1995. Printing sheet: 3/4. Word count: 14,000. First printing in June 1995. Print run: 1-1000. Book number: 155066·1-11474. Heading: 264-26.
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.