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PHOSPHORUS, ALL FORMS Method 365.2 (Colorimetric, Ascorbic Acid, Single Reagent) STORET NO. See Section 4 1 Scope and ApphcatlOn 11 These methods cover the determmatlOn of specIfied forms of phosphorus m dnnkmg, surface and sahne waters, domestIC and mdustnal wastes 12 The methods are based on reactIons that are specIfic for the orthophosphate lOn Thus, dependmg on the preSCrIbed pre-treatment of the sample, the varIOUS forms of phosphorus gIven m FIgure 1 may be determmed These forms are defined m Section 4 1 2 1 Except for m-depth and detaIled studIes, the most commonly measured forms are phosphorus and mssolved phosphorus, and orthophosphate and dIssolved orthophosphate Hydrolyzable phosphorus IS normally found only m sewage-type samples and msoluble forms of phosphorus are determmed by calculatlOn 13 The methods are usable m the 001 to 0 5 mg P/1 range 2 Summary of Method 2 1 22 Ammomum molybdate and antimony potaSSIUm tartrate react m an aCId medIUm wIth dIlute solutlOns of phosphorus to form an antlmony-phospho-molybdate complex ThIS complex IS reduced to an mtensely blue-colored complex by ascorbIC aCId The color IS proportlOnal to the phosphorus concentratlOn Only orthophosphate forms a blue color m thIS test Polyphosphates (and some orgamc phosphorus compounds) may be converted to the orthophosphate form by sulfurIC aCId hydrolysIs Orgamc phosphorus compounds may be converted to the orthophosphate form by persulfate digestIon(2) 3 Sample Handhng and PreservatlOn 3 1 3 2 3 3 If benthIC depOSIts are present m the area bemg sampled, great care should be taken not to mclude these depOSIts Sample contamers may be of plastIC matenal, such as cubitamers, or of Pyrex glass If the analySIS cannot be performed the day of collectlOn, the sample should be preserved by the additlOn of2 ml conc H2S04 per hter and refrIgeratlOn at 4°C 4 DefimtlOns and Storet Numbers 4 1 Total Phosphorus (P) - all of the phosphorus present In the sample, regardless of form, as measured by the persulfate digestlOn procedure (00665) 41 1 Total Orthophosphate (P, ortho) - Inorgamc phosphorus [(P04y3] m the sample asmeasuredbythedIrectcolOrImetrIcanalySISprocedure (70507) 412 Total Hydrolyzable Phosphorus (P, hydro) - phosphorus m the sample as measured by the sulfurIC aCId hydrolySIS procedure, and mInUS pre-determmed orthophosphates ThIS hydrolyzable phosphorus Includes polyphosphorus [(P20 7)-4, (P30 1Oy 5 , etc] plus some orgamc phosphorus (00669) Approved for NPDES Issued 1971 3652-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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