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PHOSPHORUS, ALL FORMS Method 365.3 (Colorimetric, Ascorbic Acid, Two Reagent) 1 Scope and ApplicatlOn 1 1 12 These methods cover the determmatlOn of specified forms of phosphorus m dnnkmg, surface and saline waters, domestic and mdustnal wastes The methods are based on reactlOns that are specific for the orthophosphate lOn Thus, dependmg on the prescnbed pretreatment of the sample, the vanous forms may be determmed 1 2 1 Except for m-depth and detal1ed studies, the most commonly measured forms are phosphorus and dissolved 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 Themethodsareusablemthe001to12mgP/1range 2 Summary ofMethod 21 Ammomum molybdate and antimony potassmm tartrate react m an aCid medmm with dl1ute solutions 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 concentr~tlOn 22 Only orthophosphate forms a blue color m this test Polyphosphates (and some orgamc phosphorus compounds) may be converted to the orthophosphate form by sulfunc-acld- hydrolYSIS Orgamc phosphorus compounds may be converted to the orthophosphate form by persulfate dlgestlOn 3 Sample Handling and PreservatlOn 31 If benthiC depOSits are present m the area bemg sampled, great care should be taken not to mc1ude these depOSits 32 Samplecontamersmaybeofplasticmatenal,suchascubltamers,orofPyrexglass 33 If the analySIS cannot be performed the day of collectlOn, the sample should be preserved by the addltlOn of2 ml conc H2S04 per liter and refngeratlOn at 4°C 13 4 Defimttons and Storet Numbers , 4 1 Total Phosphorus (P) - all ofthe phosphorus present m the sample, regardless oHorm, as measured by the persulfate digestion procedure (00665) Approved for NPDES Issued 1978 41 1 Total Orthophosphate (P, ortho) - morgamc phosphorus [(P0 t3 4 asmeasuredbythedirectcolonmetncanalySISprocedure (70507) 412 Total Hydrolyzable Phosphorus (P, hydro) - phosphorus m the sample as measured by the sulfunc aCid hydrolysIs procedure, and mmus pre-determmed orthophosphates ThiS hydrolyzable phosphorus mc1udes polyphosphorus [(P0)-4,(P0 t5 27 31O , etc]plussomeorgamcphosphorus (00669) 3653-1 STORET NO. See Section 4 ] m the samplePDF Image | Methods for Chemical Analysis of Water and Wastes
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