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PETROLEUMHYDROCARBONS, TOTAL RECOVERABLE <br /> Method 418.1 (Spectrophotometric, Infrared) <br /> v <br /> STORET NO. 45501 <br /> 1. Scope and Application <br /> 1.1 This method is for the measurement of fluorocarbon-113 .extractable petroleum <br /> hydrocarbons from surface and saline waters,industrial and domestic wastes. <br /> 1.2 The method is applicable to measurement of light fuels, although loss of about half of any <br /> gasoline present during the extraction manipulations can be expected. <br /> 1.3 The method is sensitive to levels of 1 mg/1 and less, and may be extended to ambient <br /> monitoring. <br /> 2.; Summary of Method <br /> 2.1 The sample is acidified to a low pH(<2)and serially extracted with fluorocarbon-113 in <br /> a separatory funnel'. Interferences are removed with silica gel adsorbant. Infrared <br /> analysis of the extract is performed by direct comparison with standards. <br /> 3. Definitions <br /> 3.1 As in the case of Oil and Grease, the parameter of Petroleum Hydrocarbons is defined by <br /> the method. The measurement may be subject to interferences and the results should be <br /> evaluated accordingly. 4 <br /> 3.2 Oil and Grease is a-measure of biodegradable animal greases and vegetable oils,along k <br /> with the relative.non=biodegradable mineral oils. Petroleum hydrocarbons is the measure <br /> of only the mineral oils. Maximum information may be obtained using both methods to <br /> measure and characterize oil and grease of all sources-. <br /> 4. Sampling and Storage <br /> 4.1 A representative sample of 1 liter volume should be collected in a glass bottle. Because <br /> losses of grease will occur on sampling equipment,the collection of a composite sample is <br /> impractical. The entire sample is consumed by this test; no other analyses may be <br /> performed using aliquots of the sample. <br /> 4.2 A delay between. sampling and analysis of greater than 4 hours requires sample <br /> preservation by;the addition of 5 ml HCl (6.1). A delay of greater than'48 hours also <br /> requires refrigeration for sample preservation. <br /> 5. Apparatus <br /> 5.1 Separatory funnel, 2000 ml, with Teflon stopcock. <br /> 5.2 Filter paper,Whatman No. 40, 11 cin. <br /> 5.3 Infrared spectrophotometer, scanning. or fixed wavelength, for measurement.around <br /> 2950 cm-'. <br /> 5.4- Cells, 10 mm, 50 mm, and 100 mm pathlength, sodium chloride or infrared grade glass. <br /> 5.5 Magnetic stirrer,with Teflon coated stirring bars. <br /> 6. Reagents <br /> 6.1 Hydrochloric acid, 1:1. Mix equal volumes of cone HCl_and distilled water. <br /> Issued 197:8 <br /> 418.1-1 . <br />