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1 PHENOLICS, TOTAL RECOVERABLE Method 420.3 (Spectrophotometric, MBTH with Distillation) STORET NO. 32730 Scope and ApphcatlOn 11 This method IS apphcable to the analysIs of dnnkmg, surface and sahne waters, domestic and mdustnal wastes 12 The method IS capable of measunng phenohc matenals at the 2 ug/l 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 measunng phenohc matenals that contam from 50 to 1000 ug/l m the aqueous phase (without solvent extractlOn) usmg phenol as a standard 14 It IS not possible to use this method to differentiate between different kmds ofphenols Summary ofMethod 2 1 This method IS based on the couphng of phenol With MBTH m an aCid medmm usmg cenc ammomum sulfate as an OXidant The couphng takes place m the p-posl!10n, If this posltlOn IS occupied, the MBTH reagent will react at a free O-posltl0n The colors obtamed have maximum absorbance from 460-595 nm For phenol and most phenohc IDlXtures the absorbance IS 520 and 490 nm Comments 31 For most samples a prehmmary dlsttllatloll1s reqmred to remove mterfenng matenals 32 Color response of phenohc matenals With MBTH IS not the same for all compounds Because phenohc type wastes usually contam a vanety of phenols, It IS not possible to duphcate a mixture of phenols to be used as a standard For this reason phenol 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 mmlmum concentration of phenohc compounds present m the sample Sample Handlmg and PreservatlOn 41 Biological degradatlOn IS mhlblted by the addltlOn of 1 gil of copper sulfate to the sample and aCldlficatlOn to a pH of less than 4 With sulfunc aCid The sample should be kept at 4°C and analyzed wlthm 24 hours after collection Interference 51 Interferences from sulfur compounds are ehmmated by aCldlfymg the sample to a pH of less than 40 With H2S04and aeratmg bnefly by stlrnng and addmg CUS04 52 OXldlzmg agents such as chlonne, detected by the hberatlOn of 10dme upon aCidification m the presence of potassmm lOdlde, are removed Immediately after samphng by the addltlOn of an excess of ferrous ammomum sulfate (6 5) I f chlonne IS not removed, the phenohc compounds may be partially oXidized and the results may be low 53 Phosphate causes a precipitate to form, therefore, phosphonc aCid should not be used for preservatlOn Allglasswareshouldbephosphatefree 2 3 4 5 Issued 1978 4203-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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