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PHENOLICS, TOTAL RECOVERABLE Method 420.2 (Colorimetric, Automated 4-AAP with Distillation) STORET NO. 32730 1 Scope and ApphcatlOn 1 1 ThIS method IS apphcable to the analysIs of dnnkmg, surface and sahne waters, domestic and mdustnal wastes 1 2 The method IS capable of measurmg phenohc matenals from 2 to 500 ug/1 m the aqueous phase usmg phenol as a standard The workmg ranges are 2 to 200 ug/1 and 10 to 500 ug/1 2 Summary of Method 2 1 ThIS automated method IS based on the distIllatlOn of phenol and subsequent reactlOn of the dIstillate wIth alkalme ferncyamde and 4-ammoantipyrme to form a red complex whIch IS measured at 505 or 520 nm The same mamfold IS used wIth the AAI or AAII 3 Sample Handhng and PreservatlOn 3 1 BlOlogICal degradatlOn IS mhibited by the additlOn of 1 gil of copper sulfate to the sample and aCIdificatlOn to a pH of less than 4 wIth phosphonc aCId The sample should be kept at 4°C and analyzed Wlthm 24 hours after collectlOn 4 Interference 41 Interferences from sulfur compounds are ehmmated by aCIdIfymg the sample to a pH of less than 4 0 wIth H 3P 04and aeratmg bnefly by stIrnng and addmg CUS04 42 OXIdIzmg agents such as chlonne, detected by the hberatlOn of lOdme upon aCIdificatlOn m the presence of potaSSIUm IOdIde, are removed ImmedIately after samplmg by the addItion of an excess of ferrous ammomum sulfate (6 5) If chlorme IS not removed, the phenohc compounds may be partIally OXIdIzed and the results may be low 43 Background contammatIOn from plastIc tubmg and sample contamers IS ehmmated by fillmg the wash receptacle by SIphon (usmg Kel-F tubmg) and usmg glass tubes for the samples and standards 5 Apparatus Issued 1974 Techmcon AutoAnalyzer (lor II) 5 1 I Sampler eqUIpped WIth contmuous mIxer 512 Mamfold 5 1 6 Reagents 6 1 DIstIllatIOn reagent Add 100 ml of conc phosphonc aCId (85% H3P04) to 800 ml of 5 1 5 1 5 1 5 1 5 1 3 ProportIOmng pump II or III 4 Heatmg bath WIth dIstIllatIOn coIl 5 DIstIllatIOn head 6 Colonmeter eqUIpped WIth a 50 mm flow cell and 505 or 520 nm filter 7 Recorder , dIstIlled water, cool and dIlute to 1 hter 4202-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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