ASTM_D_1018_-_11_2016.pdf

Designation:D101811(Reapproved 2016)Standard Test Method forHydrogen In Petroleum Fractions1This standard is issued under the fixed designation D1018;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This test method covers the determination of hydrogenin petroleum fractions that can be burned completely withoutsmoking in a wick lamp.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D1266 Test Method for Sulfur in Petroleum Products(LampMethod)D4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4177 Practice for Automatic Sampling of Petroleum andPetroleum ProductsD6299 Practice for Applying Statistical Quality Assuranceand Control Charting Techniques to Evaluate AnalyticalMeasurement System Performance3.Summary of Test Method3.1 The test specimen is burned from a cotton wick in anatmosphere of purified air.The water formed is collected fromthe combustion gases by a desiccant and weighed.4.Significance and Use4.1 Knowledge of the hydrogen content of petroleumproducts,particularly fuels,can be helpful in assessing perfor-mance characteristics.4.2 This test method is suitable for most laboratory appli-cations requiring the determination of hydrogen in liquidpetroleum lubricants and products.5.Apparatus5.1 LampA lamp(see Note 1)consisting of a 25 mLErlenmeyer flask,a burner,and a burner cap conforming to thedimensions shown in Fig.1.The burner consists of twoconcentric glass tubes,the external one having an arm,provided with standard-taper glass joints for connection withthe flask,chimney,and burner cap.The burner has a smallopening near its base to allow equalization of the pressurebetween the chimney and flask.NOTE1The lamp and burner are constructed in accordance withAppendix A3 of Test Method D1266.5.2 ChimneyA chimney(see Note 2)conforming to thedimensions shown in Fig.1.NOTE2The chimney is constructed in accordance with Appendix A3of Test Method D1266,except that the delivery tube is cut off and a shortlength of glass tubing is sealed on at right angles to the chimney.Thesecondary air inlet is not used and is sealed off.5.3 AbsorbersTwo absorption bulbs(see Note 3)suitablefor collecting and weighing the water formed during combus-tion of the sample.The bulbs shall be filled in the followingmanner:a 1 cm to 2 cm layer of glass wool,a 5 cm layer of6 mesh to 10 mesh cp anhydrous calcium chloride,a 1 cm layerof glass wool,a 2 cm layer of phosphorus pentoxide,and glasswool to the top of the absorbers.One filling is sufficient forapproximately 10 g of water.NOTE3Turner-type absorption bulbs are satisfactory for this testmethod.5.4 Cotton WickingClean,unused,uniform,two-strandtwisted cotton wicking of good quality,weighing 0.5 g m to0.6 g m per strand.5.5 Air Purifying SystemThe compressed air(WarningCompressed gas under higher pressure)for the combustion1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.03 on Elemental Analysis.Current edition approved April 1,2016.Published May 2016.Originallyapproved in 1949.Last previous edition approved in 2011 as D1018 11.DOI:10.1520/D1018-11R16.2For 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 States1 shall be purified by passage through a scrubber containingsulfuric acid(relative density 1.84),a surge chamber packedwith glass wool,and a drying tower filled with 10 mesh to20 mesh anhydrous calcium sulfate3and phosphorus pentoxidein that order.A length of rubber tubing suitable for connectionto the inlet tube of the burner shall be connected to the exit ofthe tower.5.6 Drying TubeA small U-tube containing anhydrouscalcium sulfate.35.7 Ice-Water Bath,large enough to hold the two absorbersin tandem,immersed to a depth of approximately 5 cm.6.Reagents and Materials6.1 Purity of ReagentsReagent grade chemicals shall beused in all tests.Unless otherwise indicated,it is intended thatall reagents conform to the specifications of the Committee on