1、Designation:E174795(Reapproved 2011)Standard Guide forPurity of Carbon Dioxide Used in Supercritical FluidApplications1This standard is issued under the fixed designation E1747;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year
2、 of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.INTRODUCTIONThe rapid commercial development of carbon dioxide for use in supercritical fluid extraction(SFE)and supercritical flu
3、id chromatography(SFC)has hastened the need to establish common puritystandards to be specified by specialty gas suppliers.As a consequence of its isolation frompetrochemical side-streams or as a by-product of fermentation or ammonia synthesis,carbon dioxidecontains a wide range of impurities that c
4、an interfere with analytical quantification or instrumentoperation.This guide is intended to serve as a guide to specialty gas suppliers for testing the suitabilityof carbon dioxide for use in SFC and SFE applications.1.Scope1.1 This guide defines purity standards for carbon dioxide toensure the sui
5、tability of liquefied carbon dioxide gas for use inSFE and SFC applications(see Guide E1449 for definitions ofterms).This guide defines quantitation,labeling,and statisticalstandards for impurities in carbon dioxide that are necessaryfor successful SFE or SFC laboratory work,and it suggestsmethods o
6、f analysis for quantifying these impurities.1.2 This guide is provided for use by specialty gas supplierswho manufacture carbon dioxide specifically for SFE or SFCapplications.SFE or SFC carbon dioxide(CO2)productsoffered with a claim of adherence to this guide will meetcertain absolute purity and c
7、ontaminant detectability require-ments matched to the needs of current SFE or SFC techniques.The use of this guide allows different SFE or SFC CO2productofferings to be compared on an equal purity basis.1.3 This guide considers contaminants to be those compo-nents that either cause detector signals
8、that interfere with thoseof the target analytes or physically impede the SFE or SFCexperiment.1.4 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.5 This standard does not purport to address all of thesafety concerns,if any,asso
9、ciated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D2504 Test Method for Noncondensable Gases in C2andLighter Hydrocarbon
10、 Products by Gas ChromatographyD2820 Test Method for C Through C Hydrocarbons in theAtmosphere by Gas Chromatography(Withdrawn 1993)3D3670 Guide for Determination of Precision and Bias ofMethods of Committee D22D3686 Practice for Sampling Atmospheres to Collect Or-ganic Compound Vapors(Activated Cha
11、rcoal Tube Ad-sorption Method)D3687 Practice for Analysis of Organic Compound VaporsCollected by the Activated Charcoal Tube AdsorptionMethodD4178 Practice for Calibrating Moisture AnalyzersD4532 Test Method for Respirable Dust in Workplace At-mospheres Using Cyclone SamplersE260 Practice for Packed
12、 Column Gas ChromatographyE355 Practice for Gas Chromatography Terms and Relation-shipsE594 Practice for Testing Flame Ionization Detectors Usedin Gas or Supercritical Fluid Chromatography1This guide is under the jurisdiction of ASTM Committee E13 on MolecularSpectroscopy and Separation Science and
13、is the direct responsibility of Subcom-mittee E13.19 on Separation Science.Current edition approved Nov.1,2011.Published December 2011.Originallyapproved in 1995.Last previous edition approved in 2005 as E1747 95(2005).DOI:10.1520/E1747-95R11.2For referenced ASTM standards,visit the ASTM website,www
14、.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr H
15、arbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 E697 Practice for Use of Electron-Capture Detectors in GasChromatographyE1449 Guide for Supercritical Fluid Chromatography Termsand RelationshipsE1510 Practice for Installing Fused Silica Open TubularCapillary Columns in Gas Chro
16、matographs2.2 CGA Publications:4CGA G-5.4 Standard for Hydrogen Piping Systems at Con-sumer LocationsCGAP-1 Safe Handling of Compressed Gases in ContainersCGA P-9 The Inert Gases:Argon,Nitrogen and HeliumCGA P-12 Safe Handling of Cryogenic LiquidsCGA V-7 Standard Method of Determining Cylinder ValveOutlets Connections for Industrial Gas MixturesG-6 Carbon DioxideHB-3 Handbook of Compressed Gases3.Classification3.1 This guide covers the following four different classes ofcompounds:3.1.1 Liquid-Ph