ASTM_D_3279_-_19.pdf

Designation:D327919Standard Test Method forn-Heptane Insolubles1This standard is issued under the fixed designation D3279;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year 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.1.Scope1.1 This test method covers determination of the masspercent of asphaltenes as defined by insolubility in normal-heptane solvent.It is applicable to all solid and semi-solidpetroleum asphalts containing little or no mineral matter,to gasoils,to heavy fuel oils,and to crude petroleum that has beentopped to a cut-point of 343 C or higher.1.2 The values stated in SI units are to be regarded as thestandard.No other units of measurement are included in thisstandard.1.3 The text of this standard references notes and footnoteswhich provide explanatory material.These notes and footnotes(excluding those in tables and figures)shall not be consideredas requirements of the standard.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility 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.See Section 7 for a specific hazard statement.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2C670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction Materials3.Summary of Test Method3.1 The sample is dispersed in n-heptane and filteredthrough a glass-fiber pad.The insoluble material is washed,dried,and weighed.4.Significance and Use4.1 This test method is useful in quantifying the asphaltenecontent of petroleum asphalts,gas oils,heavy fuel oils,andcrude petroleum.Asphaltene content is defined as those com-ponents not soluble in n-heptane.5.Apparatus and Materials5.1 The assembly of the dispersing apparatus is illustrated inFig.1 with details of the component parts as follows:5.1.1 Erlenmeyer Flask,of 250-mL capacity adapted to anAllihn-type reflux condenser.5.1.2 Magnetic Stirrer and Magnetic-Stirrer Hot Plate.5.1.3 Bitumen Crucible or Gooch Crucible,glazed insideand outside with the exception of the outside bottom surface.The approximate dimensions shall be a diameter of 44 mm atthe top tapering to 36 mm at the bottom and a depth of 20 to30 mm.5.1.4 Glass Microfiber Filter Pad,32 to 34 mm in diameter,fine porosity,fast flow rate,1.5-m particle retention.5.1.5 Filter Flask,heavy-wall with side tube,500-mLcapacity.5.1.6 Filter Tube,40 to 42 mm in inside diameter.5.1.7 Rubber Tubing,or adapter for holding Gooch crucibleon the filter tube.NOTE1Other suitable assemblies permitting vacuum filtration with acrucible may be used.5.1.8 Oven,capable of maintaining a temperature of 110 65 C.5.1.9 Desicator,of suitable size,charged with an effectivedesiccant.5.1.10 Balance,capable of making the required measure-ments to an accuracy of at least 0.0001 g.6.Reagent6.1 n-Heptane,99.0 minimum mol%(pure grade).1This test method is under the jurisdiction of ASTM Committee D04 on Roadand Paving Materials and is the direct responsibility of Subcommittee D04.47 onMiscellaneous Asphalt Tests.Current edition approved June 15,2019.Published June 2019.Originallyapproved in 1973.Last previous edition approved in 2012 as D3279 12.DOI:10.1520/D3279-19.2For referenced ASTM standards,visit the ASTM website,www.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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 7.Hazards7.1 n-Heptane has a boiling point of 98 C and a flash pointof 1 C,which means that it should be handled with care.Itis recommended that both the reflux dispersion and filtrationsteps be conducted in a ventilated hood and away from flamesor other sources of heat.8.Preparation of Crucible8.1 Place the Gooch crucible plus one thickness filter pad inan oven at about 110 6 5 C for 30 min,allow to cool in adesiccator for 30 6 5 min,and then determine the mass to thenearest 0.1 mg.Designate this mass as A.Store in a desiccatorun