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GB/T 11847-2008: Determination of specific surface area of uranium dioxide powder by BET capacity method
Status: Valid GB/T 11847: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 11847-2008 | English | 229 |
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Determination of specific surface area of uranium dioxide powder by BET capacity method
| Valid |
GB/T 11847-2008
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| GB/T 11847-1989 | English | 319 |
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Determination of specific surface area of uranium dioxide powder by multipoint BET method
| Obsolete |
GB/T 11847-1989
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PDF similar to GB/T 11847-2008
Basic data | Standard ID | GB/T 11847-2008 (GB/T11847-2008) | | Description (Translated English) | Determination of specific surface area of uranium dioxide powder by BET capacity method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | F46 | | Classification of International Standard | 27.120.30 | | Word Count Estimation | 10,118 | | Date of Issue | 2008-06-19 | | Date of Implementation | 2009-04-01 | | Older Standard (superseded by this standard) | GB/T 11847-1989 | | Regulation (derived from) | Announcement of Newly Approved National Standards No. 11 of 2008 (No. 124 overall) | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies the method for the determination of the BET specific surface area of ??uranium dioxide powder method. This standard applies to uranium dioxide powder specific surface area measurement, the measuring range is: (1 to 40) m/g. Other powder or porous material can be measured with reference to the specific surface area used. | GB/T 11847-2008: Determination of specific surface area of uranium dioxide powder by BET capacity method
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Determination of specific surface area of \u200b\u200buranium dioxide powder by BET capacity method
ICS 27.120.30
F46
National Standards of People's Republic of China
Replacing GB/T 11847-1989
Uranium dioxide powder specific surface area measuring
BET volumetric method
Posted 2008-06-19
2009-04-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard replaces GB/T 11847-1989 "uranium dioxide powder by multipoint BET specific surface area of \u200b\u200blaw."
This standard compared with GB/T 11847-1989, the main changes are as follows.
--- Increase in single-point BET method, including the principle of a single point BET method, test procedures, the results of calculation and precision of the method;
--- Equipment and materials added to the material, liquid oxygen to liquid nitrogen thermometer thermometer;
--- Take a sample and the amount of vacuum degassing range has been adjusted;
--- Instrument calibration constant as a normative Annex A;
--- Mercury vapor pressure and density table table as informative Appendix B;
--- Original instrument assembly Appendix A Technical Notes as instrument parameters.
Appendix A of this standard is a normative appendix, Appendix B is an informative annex.
The standard proposed by China National Nuclear Corporation.
This standard by the National Standardization Technical Committee of nuclear energy.
This standard was drafted. China Jianzhong Nuclear Fuel Limited.
The main drafters. Zhang Xixiang, Qin Zhiping, You Yafei, Chen Lin.
This standard replaces the standards previously issued as follows.
--- GB/T 11847-1989.
Uranium dioxide powder specific surface area measuring
BET volumetric method
1 Scope
This standard specifies the BET volumetric method (single point, multipoint) uranium dioxide powder specific surface area measuring method.
This standard applies to uranium dioxide powder specific surface area measurement, measuring range. (1 ~ 40) m2/g. Powders or other porous material
Than the surface area can be measured with reference to use.
2 principle of the method
2.1 Fundamentals
Placed in the sample gas in the system, the external and internal surfaces of the through-hole material particles will physically adsorbed at low temperatures. Allow a known amount of
Adsorbed gas into the sample chamber, the sample is adsorbed gas, and thus the limited volume constant pressure decreases until adsorption equilibrium is reached
until. It is equal to the amount of gas adsorbed into the sample burette and the total amount of gases adsorbed equilibrated sample burette remaining gas bubbles and the amount of
BET adsorption principle formula, see formula (1).
M1 = 1C Vp +
C-1
C Vp m1
(1)
Where.
C --- adsorption heat-related constants;
Vp m1 --- single molecular layer adsorption capacity, in milliliters (mL).
It was measured to calculate the adsorption capacity of the sample monolayer according to formula (1), to calculate the surface area of \u200b\u200bthe sample.
More than 2.2-point method
2.2.1 the total adsorption (Vp) is calculated.
The total adsorption (Vp) See calculation formula (2).
Vp = 273.2
1.0132 × 105
Vp 1
T1 -
T2 -
The T () Ju (2)
Where.
Vp 1 --- FIG. 1 A, B, 9, C to 0 between the volume in milliliters (mL of);
Vp 2 --- FIG. 1 H, A, B, 9, C to 0 between the volume in milliliters (mL of);
T2 --- Adsorption equilibrium temperature when the unit is open (K);
α --- nitrogen at liquid nitrogen temperature correction factor undesirable behavior;
Vp 3 --- grinding mouth H vial volume except the following sample, in milliliters (mL);
T Ju --- liquid nitrogen temperature, the unit is open (K).
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