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10-28-1993 14 30 •• 303 490 1522 ATI• FT COLL I NS• - P.es <br /> i <br /> PETROLEUM HYDROCARBONS, TOTAL RECOVERABLE <br /> Method 418.1 (Spectrophotometric, Infmred) <br /> STORET NO. 43501 <br /> t1. Scope and Application <br /> 1.1 This method is for the measurement of fluorocarbon-113 extractable petroleum <br /> ' hydrocarbons from surface and sialine watem industrial and domestle wants. <br /> 1.2 The method Is applicable to measurement of light fuels.although loan of abr+ut 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/l and less, and may be extended to ambient <br /> monitoring. <br /> 2. SummaryofMethod <br /> 2.1 The sample is acidified to a low pH(e 2)and serially extracted with fluorocarbon-1 13 in <br /> a separatury funnel Interferences are removed with silica gel adsorbent. Infrared <br /> analysis of the extract is performed by direct comparison%it;s standards <br /> 3. Definitions <br /> 3.1 As in the can 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 oe <br /> evaluared accordingly. 1 <br /> 3.2 Oil and Grease is a measure of biodegradable animal greases and vegetable oils along <br /> with the relative non-biodegradable mineral oils.Petroleum hydrocarbons is the measure <br /> of only the mineral oils.Maximum infoniriation may be obtained using both methods to <br /> measure and characterise oil and grease of ail sources. <br /> 4. Umpl!ng and Storage <br /> 4.1 A representative sample of 1 liter volume should be collected in a glass bottle. Bemuse <br /> losses of gr+aase will occur on sampling equipment,the collection of a emposite sample is <br /> impractical- The entire sample is consumed by this test; no other analyna may be <br /> performed using aliquots otthe sample. <br /> 42 A delay bet%.een sampling and analysis of greater than 4 hours requites sample <br /> preservation by the addition of 3 rel HCl (6 1) A delay of greater than 48 hours also <br /> requires refngeration for sample preservation <br /> S. Apparatus <br />' 3.1 3eparatory funnel.2000 ml,with Teflon stopcock. <br /> 3.2 Filter paper,Whatman No.40. t I crit. <br /> 3.3 Infrared spectrophotometer, scanning or fixed wavelength. for measurement around <br /> 2950cm `. <br /> 1 <br /> 5.4 Cells. 10 nam, SO mm.and 100 nam pathlength,sodium chloride or infrared grade glass, <br /> 3.5 Magnetsu stirrer.with Teflon coated stirring bars. <br /> 6 Reagents <br /> 6.1 Hydrochloric acid, 1.1.Mix d'qual voitimes nfcoric HCl end distilliA water. <br /> Issued 1978 <br /> <te.t.r <br /> c�=' a <br /> i <br />