
【国外标准】 Standard Test Method for Precipitated Silica-Surface Area by Multipoint BET Nitrogen Adsorption
本网站 发布时间:
2024-02-28
开通会员免费在线看70000余条国内标准,赠送文本下载次数,单本最低仅合13.3元!还可享标准出版进度查询、定制跟踪推送、标准查新等超多特权!  
查看详情>>

适用范围:
3.1 This test method is used to measure the surface area of precipitated, hydrated silicas that is available to the nitrogen molecule using the multipoint (B. E. T.) method. Single point nitrogen surface area is measured in accordance with the Test Methods D5604.3.2 Solids adsorb nitrogen, and under specific conditions, the adsorbed molecules approach a monomolecular layer. The quantity in this hypothetical monomolecular layer is calculated using the BET equation. Combining this with the area occupied by the nitrogen molecule yields the total surface area of the solid.3.3 This test method measures the estimated quantity of nitrogen in the monomolecular layer by adsorption at liquid nitrogen temperature and at several (at least five) partial pressures of nitrogen.3.4 Before a surface area determination can be made it is necessary that the silica be stripped of any material which may already be adsorbed on the surface. The stripping of adsorbed foreign material eliminates two potential errors. The first error is associated with the weight of the foreign material. The second error is associated with the surface area that the foreign material occupies.1.1 This test method covers a procedure which is used to measure the surface area of precipitated hydrated silicas by the conventional Brunauer, Emmett, and Teller (BET)2 theory of multilayer gas adsorption behavior using multipoint determinations, similar to that used for carbon black in Test Method D6556. This test method specifies the sample preparation and treatment, instrument calibrations, required accuracy and precision of experimental data, and calculations of the surface area results from the obtained data.1.2 This test method is used to determine the nitrogen surface area of precipitated silicas with specific surface areas in the range of 10 to 500 m2/g.1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. The minimum safety equipment should include protective gloves, sturdy eye and face protection, and means to deal safely with accidental mercury spills.1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
标准号:
ASTM D1993-22
标准名称:
Standard Test Method for Precipitated Silica-Surface Area by Multipoint BET Nitrogen Adsorption
英文名称:
Standard Test Method for Precipitated Silica-Surface Area by Multipoint BET Nitrogen Adsorption标准状态:
Active-
发布日期:
-
实施日期:
出版语种:
- 推荐标准
- AS 2545/B-1993 (Reference Use Only) Subcontract conditions (AS 2545-1993) - Annexure Part B
- AS 2550.5-1993 Cranes - Safe use Mobile and vehicle-loading cranes
- AS 2610.2-1993 Spa pools Private spas
- AS 2638-1991/Amdt 1-1993 Sluice valves for waterworks purposes
- AS 2712-1993 Solar water heaters - Design and construction
- AS 2832.2-1991/Amdt 1-1993 Guide to the cathodic protection of metals - Compact buried structures
- AS 2888.11-1993 Methods of testing plastics waste fittings Method for cyclic testing of plastics telescopic waste connectors (rubber-ring joint type)
- AS 2891.5-1993 Methods of sampling and testing asphalt Determination of stability and flow - Marshall procedure
- AS 2891.7.1-1993 Methods of sampling and testing asphalt Determination of maximum density of asphalt - Water displacement method
- AS 2891.9.1-1993/Amdt 1-1996 Methods of sampling and testing asphalt - Determination of bulk density of compacted asphalt - Waxing procedure
- AS 2891.9.2-1993/Amdt 1-1996 Methods of sampling and testing asphalt - Determination of bulk density of compacted asphalt - Presaturation method
- AS 2891.9.3-1993 Methods of sampling and testing asphalt Determination of bulk density of compacted asphalt - Mensuration method
- AS 3000-1991/Amdt 2-1993 Electrical installations - Buildings, structures and premises (known as the SAA Wiring Rules)
- AS 3015-1993 Electrical installations - Extra-low voltage d.c. power supplies within public telecommunications networks
- AS 3084-1993 Telecommunications installations - Telecommunications pathways and spaces for commercial buildings