ASTM_D_7678_-_11.pdf

Designation:D767811Standard Test Method forTotal Petroleum Hydrocarbons(TPH)in Water andWastewater with Solvent Extraction using Mid-IR LaserSpectroscopy1This standard is issued under the fixed designation D7678;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 the determination of totalpetroleum hydrocarbons(TPH)in water,and waste water,thatare extractable from an acidified sample with a cyclic aliphatichydrocarbon(for example cyclohexane),and measured by IRabsorption in the region of 1370-1380 cm-1(7.25-7.30microns).Polar substances are removed by clean-up withFlorisil.1.2 The method also considers the volatile fraction ofpetroleum hydrocarbons which is lost by gravimetric methodsthat require solvent evaporation prior to weighing,as well asby solventless IR methods that require drying of the employedsolid phase material prior to measurement.Similarly,a morecomplete fraction of extracted petroleum hydrocarbon is ac-cessible by this method as compared to GC methods that use atime window for quantification,as petroleum hydrocarbonseluting outside these windows are also quantified.1.3 This method defines oil and grease in water and waste-water as that which is extractable in the test method andmeasured by IR absorption in the region of 1370-1380 cm-1(7.25 7.30 microns).1.4 This method covers the range of 0.5 to 1000 mg/L andmay be extended to a lower or higher level by extraction of alarger or smaller sample volume collected separately.1.5 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.6 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:2D1129 Terminology Relating to WaterD1141 Practice for the Preparation of Substitute OceanWaterD1193 Specification for Reagent WaterD1192 Guide for Equipment for Sampling Water and Steamin Closed Conduits(Withdrawn 2003)3D2777 Practice for Determination of Precision and Bias ofApplicable Test Methods of Committee D19 on WaterD3370 Practices for Sampling Water from Closed ConduitsD3921 Test Method For Oil and Grease and PetroleumHydrocarbons in Water(Withdrawn 2013)3D5847 Practice for Writing Quality Control Specificationsfor Standard Test Methods for Water AnalysisD7575 Test Method for Solvent-Free Membrane Recover-able Oil and Grease by Infrared DeterminationE168 Practices for General Techniques of Infrared Quanti-tative Analysis2.2 ISO Standards:4ISO 9377-2 Determination of Hydrocarbon Oil Index3.Terminology3.1 DefinitionsFor definitions of terms used in this testmethod,refer to Terminology D1129 and Practices E168.3.2 Definitions of Terms Specific to This Standard:3.2.1 Total petroleum hydrocarbons(TPH),nthe extractedmaterial which remains in the solvent after treatment withNa2SO4and Florisil.4.Summary of Test Method4.1 An acidified 900 mL sample of water or wastewater isextracted with 50 mL of cyclohexane.The extract is treated1This test method is under the jurisdiction of ASTM Committee D19 on Waterand is the direct responsibility of Subcommittee D19.06 on Methods forAnalysis forOrganic Substances in Water.Current edition approved Feb.1,2011.Published March 2011.DOI:10.1520/D7678-11.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from International Organization for Standardization(ISO),1,ch.dela Voie-Creuse,Case postale 56,CH-1211,Geneva 20,Switzerland,http:/www.iso.ch.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 with sodium sulfate and Florisil to remove traces of water,aswell as polar substances,thereby producing a solution contain-ing nonpolar material.The nonpolar material is referred to astotal petroleum hydrocarbons(TPH)and is measured bymid-infrared laser spectroscopy.5.Significance and Use5.1 The presence and concentration of total petroleumhydrocarbons,as well as oil and grease,in domestic andindustrial wastewater is of concern to the public because of itsdeleterious aesthetic effect and its impact on aquatic life.5.2 Regulations and standards have been established thatrequire monitoring of total petroleum hydrocarbons as well asoil and grease in water and wastewater.6.Interferences6.1 Soaps,detergents,surfactants