ASTM D3467-04(R2020) pdf free download
ASTM D3467-04(R2020) pdf free download.Standard Test Method for Carbon Tetrachloride Activity of Activated Carbon
1. Scope
1.1 This test method covers the determination of the acti- vation level of activated carbon. Carbon tetrachloride (CCl 4 ) activity is defined herein as the ratio (in percent) of the weight of CCl 4 adsorbed by an activated carbon sample to the weight of the sample, when the carbon is saturated with CCl 4 under conditions listed in this test method. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 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 appro- priate safety, health, and environmental practices and deter- mine the applicability of regulatory limitations prior to use. Specific hazards statements are given in Section 7. 1.4 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Terminology
3.1 Definitions—Terms relating to this test method are defined in Terminology D2652.
4. Summary of Test Method
4.1 Activity is determined by flowing CCl 4 -laden air through a sample of carbon of known weight, under specified conditions, until there is no further increase in the weight ofthe sample, then determining the weight ofthe CCl 4 adsorbed. The apparatus required for the test consists essentially of means to control the supply air pressure, to remove oil and water in both liquid and vapor states from the supply air, to produce the specified concentration of CCl 4 in the air flowed through the carbon sample, and to control the flow rate of the gas (air + CCl 4 ) mixture through the sample.
5. Significance and Use
5.1 Activity as measured by this test method is basically a measure of the pore volume of the activated carbon sample. This test method is therefore a means ofdetermining the degree of completion of the activation process, hence a useful means ofquality control for gas-phase activated carbons. This activity number does not necessarily provide an absolute or relative measure of the effectiveness of the tested carbon on other adsorbates, or at other conditions of operation.
6. Apparatus and Materials
6.1 Carbon Tetrachloride, reagent grade. 6.2 Supply of Clean, Dry, Oil-Free Air—The air must be passed through a HEPA filter and a bed of activated carbon containing at least 500 mL of carbon per 1670 mL/min of air flow. Relative humidity of the air must be less than 5 % at 25 °C. 6.3 Balance, capable of weighing to within 610 mg. 6.4 Pressure Regulator. 6.5 CCl 4 Gas-Generating Device, capable of maintaining a CCl 4 concentration of 250 6 10 mg/L in the air stream at a temperature of 25 6 1 °C, equivalent to a relative saturation of 27.5 %. A typical generation device, shown in Fig. 1, consists of a gas-washing bottle and a refrigerated bath capable of maintaining a bath temperature of 0 °C. See also Table 1. 6.6 Stopcock, three-way. 6.7 Regulating Valve, needle valve, flowmeter, and clock.
7. Hazards
7.1 Carbon tetrachloride vapor is toxic and should not be inhaled. It is advisable to handle carbon tetrachloride and the test equipment described in this test method in a well-designed chemical fume hood. The most recent regulations issued by the Occupational Safety and Health Administration and published in the Federal Register should be followed with regard to allowable human exposure. The most recently obtained Mate- rial Safety Data Sheet (MSDS) obtained from the supplier or manufacturer of the carbon tetrachloride should be available as a guide, as well. Acceptable concentrations ofcarbon tetrachlo- ride for stack release also should conform to the regulations of the United States Environmental Protection Agency, also available in the Federal Register.
