ASTM_D_3831_-_12.pdf

Designation:D383112Standard Test Method forManganese in Gasoline By Atomic AbsorptionSpectroscopy1This standard is issued under the fixed designation D3831;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.Scope*1.1 This test method covers the determination of the totalmanganese content,present as methylcyclopentadienyl manga-nese tricarbonyl(MMT),2of gasoline within the concentrationrange from 0.25 to 40 mg/L of manganese.1.2 This test method is applicable to reformulated gasolinecontaining up to 12%volume methyl tertiary butylether or upto 10%volume ethanol.This test method may not be appli-cable to highly cracked materials containing greater than 18volume%olefins as determined by Test Method D1319(nondepentanized).1.3 This test method has been developed and tested specifi-cally for the determination of MMT in gasoline over therecommended concentration range.Application of the methodto other concentration ranges,to the determination of MMT inother materials,or to the determination of other manganesecompounds in gasoline have not been tested1.4 The values stated in SI units are to be regarded as thestandard.The preferred concentration units are mg/L manga-nese.1.5 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.For specificwarning statements,see Sections 5 and 6.2.Referenced Documents2.1 ASTM Standards:3D1319 Test Method for Hydrocarbon Types in Liquid Petro-leum Products by Fluorescent Indicator AdsorptionD4057 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 PerformanceD6300 Practice for Determination of Precision and BiasData for Use in Test Methods for Petroleum Products andLubricantsD6792 Practice for Quality System in Petroleum Productsand Lubricants Testing LaboratoriesD7740 Practice for Optimization,Calibration,and Valida-tion of Atomic Absorption Spectrometry for Metal Analy-sis of Petroleum Products and Lubricants3.Summary of Test Method3.1 The gasoline sample is treated with bromine solutionand diluted with methyl isobutyl ketone.The manganesecontent of the sample is determined by atomic absorptionspectrometry using an air-acetylene flame at 279.5 nm andstandards prepared from an organo-manganese standard mate-rial.3.2 Protocols for using atomic absorption spectrometry aregiven in Practice D7740.4.Significance and Use4.1 Certain organo-manganese compounds act as antiknockagents when added to gasoline.This test method provides ameans for determining the concentration of such a material ina gasoline sample.5.Apparatus5.1 Atomic Absorption Spectrometer,capable of scaleexpansion and equipped with a manganese hollow-cathodelamp for monitoring manganese absorption at 279.5 nm,apremix slot-type burner with rotatable burner head,and anadjustable nebulizer.(WarningHazardous.Potentially toxicand explosive.Refer to the manufacturers instrument manualfor associated safety hazards.)5.2 Vials,up to 40-mL size with polyethylene or TFE-fluorocarbon-lined caps or glass stoppers.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products and Lubricants and is the direct responsibility of SubcommitteeD02.03 on Elemental Analysis.Current edition approved June 1,2012.Published August 2012.Originallyapproved in 1979.Last previous edition approved in 2006 as D3831 01(2006).DOI:10.1520/D3831-12.2MMT is a registered trademark of Ethyl Corp.3For 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.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.3 Pipet,Delivery,1-mL size.5.4 Micropipet,100-L size,Eppendorf type or equivalent.5.5 Automatic Pipet,or equivalent delivery pipet,capable ofdelivering 9.0-mL quantities.6.Reagents6.1 Purity of ReagentsReagent grade chemicals shall beused in all tests.Unless otherwise indicated,it is intended thatall reagents shall conform to the specifications of the Commit-tee on Analytical Reagents of the American Chemical Society,where such specifications are available.4Other grades may beused,provided it is first ascertained that the reagent is ofsufficiently high purity to permit its use