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PHENOLICS, TOTAL RECOVERABLE Method 420.1 (Spectrophotometric, Manual 4·AAP with Distillation) STORET NO. 32730 1 Scope and ApphcatIOn 11 ThIs method IS apphcable to the analysIs ofdnnkmg, surface and sahne waters, domestic and mdustrIal wastes 12 The method IS capable of measunng phenohc matenals at the 5 ug/1 level when the colored end product IS extracted and concentrated m a solvent phase usmg phenol as a standard 13 The method IS capable of measurmg phenohc matenals that contam more than 50 ug/1 m the aqueous phase (wIthout solvent extractIOn) usmg phenol as a standard 14 It IS not possIble to use thIS method to dIfferentIate between dIfferent kmds ofphenols 2 Summary ofMethod 2 1 Phenohc matenals react wIth 4-ammoantIpynne m the presence of potassIUm ferncyamde at a pH of 10 to form a stable reddIsh-brown colored antIpynne dye The amount ofcolor produced IS a functIon ofthe concentratIon ofphenohc matenal 3 Comments 3 1 3 2 For most samples a prehmmary dIstl1latIon IS reqUIred to remove mterfermg materials Color response of phenohc matenals wIth 4-ammo antipyrme IS not the same for all compounds Because phenohc type wastes usually contaIn a vanety of'phenols, It IS not pOSSIbletoduphcateamIxtureofphenolstobeusedasastandard ForthISreasonphenol has been selected as a standard and any color produced by the reactIOn of other phenohc compounds IS reported as phenol ThIs value WIll represent the mimmum concentratIOn of phenohc compounds present In the sample 4 Sample Handhng and PreservatIon 4 1 BIOlogICal degradation IS mhIbited by the addItIOn of 1 gil of copper sulfate to the sample and aCIdIficatIOn to a pH of less than 4 wIth phosphonc aCId The sample should be kept at 4°C and analyzed withm 24 hours after collectIOn 5 Interference 51 Interferences from sulfur compounds are ehmmated by aCIdIfymg the sample to a pH of less than 4 wIth H3P04and aeratIng bnefly by stIrnng and addmg CUS04 52 OXIdIZIng agents such as chlonne, detected by the hberation of IOdme upon aCIdIficatIOn m the presence of potaSSIUm IodIde, are removed ImmedIately after samphng by the addItIOn of an excess of ferrous ammOnIum sulfate (7 10) If chlonne IS not removed, the phenohc compounds may be partIally oXIdIzed and the results may be low Approved for NPDES Issued 1971 Editonal reVISIon 1978 420 I-IPDF Image | Methods for Chemical Analysis of Water and Wastes
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