Laserfiche WebLink
Y <br /> ' - C&T P e Three <br /> LABORATORY ' <br /> METHODS FOR PETROLEUM HYDROCARBON <br /> EVALUATION TECHNIgUES <br /> The following is a list of,several methods available for evaluation of hydrocarbon <br /> contamination in soil samples. It includes a brief description of the advantages and <br /> disadvantages of each.Some of these methods axe not considered TPH techniques. <br /> used to complement TPH analyses during environmental assessments. This es.butane <br /> focuses on soil analyses, as they are more difri to al ass discussion <br /> TPH. Water analyses are performed s P than water analyses for <br /> modified. The hydrocarbons detected.iwa�.�w 11 the extraction step may be slightly <br /> be limited to soluble species. <br /> Method I- (EPA 5030/8015))Tata1 Volatile.Hydrocarbons,. <br /> and trap extraction (5030) followed by quantitation of vola�tilRe hydrocaThis rboroids using usesage <br /> chromatography coupled to a::flainne ionization:detector GC- g� <br /> quently used to evaluate hydrocarbon con ( )' This method is fre- <br /> stora a amination from leaking gasoline or jet.fuel <br /> g tanks. The method quantitates the aggregate hydrocarbons with boiling points <br /> below 38 C. approximately. Advantages: It ma <br /> products (gasoline vs, jet fuel) and some intermediatetcompo identification <br /> tooa lost mg/Ke <br /> detection limit..isadvantages:,The method does not determine the presence of residual <br /> products, and sample preparation"can result in unrepresentative sub-samples. <br /> Method 2- (EPA 3550/8015) TPH�'. <br /> followed b ca �. : This method uses sonication extraction (3550) <br /> Y Pfl�y GC-FID quantitation. Advantages: It allows quantitation of the three <br /> common petroleum product types (gasoline. diesel and kerosene) to a 10 m <br /> limit: and, depending upon the weathering of the lost product, may g/ detection <br /> �Dfsa�vanta� es: Si Y Permit Identification. <br /> - g _ Significant loss ' volatile components may occur due to <br /> atmosphere during sonication, detection and quantitatdro <br /> ion of higher boiling to the <br /> carbons (350+C)in the residual product is poor, and the EPA sample size of 10 grams may <br /> result in unrepresentative sub-sarriples. Y <br /> Method 3- (EPA 5030/8240) Volatile Organic Compound's VOC,8 . <br /> Purge and:trap extraction followed by GC/MS (GC/mass s 'This method employs <br /> volatile constituents.Advantages: tion of <br /> It permits identification and quantitation of�hazardous <br /> volatile compounds (priority pollutants) to a 500 <br /> It does not give a quantitative assessment of the aggregate concentration 0etection <br /> f petro <br /> le n <br /> hydrocarbons present. and is limited to volatile constituents only. <br /> Method 4- (EPA 5030/8020) Volatile 'Aromati <br /> emc' Hydrocarbons BTSE: This method <br /> by G <br /> titation of benzene, toluploys purge and trap extraction followed C-pID (photoionization detector) quare- <br /> ene, xylene(s), ethylbenzene. and , if present, chlorobenzenes. It <br /> is most applicable if gasoline contamination is suspected. Advantages: It has low level <br /> detection limits for these high-risk components.50 ug/Kg. The i duan g are similar <br /> to those listed for Method 3, <br /> Method 5- (EPA extraction is f3550/SMWW '`ta ' d <br /> an <br /> sonication '{503E}_T tal Oil and� rease..TOG: 'For this method. <br /> ollowed by gravimetric quantitation of non-volatile <br /> hydrocarbons. Advantages: This is a method <br /> that can volatile residual petroleum products such as waste oilse cavy Oils and contamination by non- <br /> 50 mg/Kg detection limit.A relatively large and thus more representative sure camp tocks can <br /> be analyzed!Disadvantages The volatile constitu <br /> ents there is no identification of hydrocarbon components.are lost during this analyses, and <br />