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PETROLEUM HYDROCARBONS, TOTAL RECOVERABLE Method 418.1 (Spectrophotometric, Infrared) STORET NO. 45501 1 Scope and Apphcat10n 1 1 Th1s method 1S for the measurement of fluorocarbon-113 extractable petroleum hydrocarbons from surface and sahne waters, mdustnal and domest1c wastes 1 2 The method 1Sapphcable to measurement ofhght fuels, although loss ofabout halfofany gasohne present dunng the extractlOn mampulatlOns can be expected 1 3 The method 1S sens1tIve to levels of 1 mg/l and less, and may be extended to amb1ent momtormg 2 Summary ofMethod 2 1 The sample 1S aC1d1fied to a low pH ( < 2) and senally extracted w1th fluorocarbon-113 m a separatory funnel Interferences are removed w1th s1hca gel adsorbant Infrared analys1s ofthe extract 1S performed by d1rect companson w1th standards 3 Defimt10ns 3 1 3 2 As m the case of 011 and Grease, the parameter of Petroleum Hydrocarbons 1S defined by the method The measurement may be subject to mterferences and the results should be evaluated accordmgly 011 and Grease 1S a measure of blOdegradable ammal greases and vegetable olls along w1ththerelativenon-blOdegradablemmeralolls Petroleumhydrocarbons1Sthemeasure of only the mmeral olls Max1mum mformatlOn may be obtamed usmg both methods to measure and charactenze 011 and grease ofall sources 4 Samphng and Storage 4 1 4 2 A representatIve sample of 1 hter volume should be collected m a glass bottle Because l o s s e s o f g r e a s e w111 o c c u r o n s a m p h n g e q U l p m e n t , t h e c o l l e c t l O n o f a c o m p o s 1 t e s a m p l e 1S 1mpractlCai The ent1re sample 1S consumed by th1s test, no other analyses may be performed usmg ahquots of the sample A delay between samplmg and analys1s of greater than 4 hours reqUlres sample preservatlOn by the add1tlOn of 5 ml HCl (6 1) A delay of greater than 48 hours also reqUlres refngeratlOn for sample preservatlOn 5 Apparatus 51 Separatory funnel, 2000 ml, w1th Teflon stopcock 52 Fllter paper, Whatman No 40, 11 cm 53 Infrared spectrophotometer, scanmng or fixed wavelength, for measurement around 2950cm-1 54 Cells, 10 mm, 50 mm, and 100 mm pathlength, sodlUm chlonde or mfrared grade glass 55 MagnetIc st1rrer, w1th Teflon coated st1rrmg bars 6 Reagents 6 1 Hydrochlonc aC1d, 1 1 M1x equal volumes ofconc HCl and d1stllied water Issued 1978 418 1-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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