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1 Scope and ApphcatlOn 1 1 1 2 1 3 These methods cover the determmatlOn of specIfied forms of phosphorus m drmkmg, surface and sahne waters, domestIc and mdustnal wastes The methods are based on reactIOns that are specIfic for the orthophosphate IOn Thus, dependmg on the prescnbed pre-treatment of the sample, the vanous 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 detatled 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 InsolubleformsofphosphorusaredetermmedbycalculatIOn The methods are usable III the 0 01 to 1 0 mg P/1 range ApproxImately 20-30 samples PHOSPHORUS, ALL FORMS Method 365.1 (Colorimetric, Automated, Ascorbic Acid) per hour can be analyzed 2 Summary of Method 21 Ammomum molybdate and antImony potassmm tartrate react m an aCId medmm WIth dIlute 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 proportIonal to the phosphorus concentratIOn 22 Only orthophosphate forms a blue color m thIS test Polyphosphates (and some orgamc phosphorus compounds) may be converted to the orthophosphate form by manual sulfunc aCId hydrolySIS Orgamc phosphorus compounds may be converted to the orthophosphate form by manual persulfate dlgestlOn(2) The developed color IS measured automatIcally on the AutoAnalyzer 3 Sample Handhng and PreservatIOn 31 If benthIc depOSIts are present m the area bemg sampled, great care should be taken not to mclude these depOSIts 32 Sample contamers may be of plastIc matenal, such as cubltamers, or of Pyrex glass 33 If the analysIs cannot be performed the same day of collectIOn, the sample should be preserved by the addItIon of2 ml conc H2S04 per hter and refngeratlOn at 4°C 4 DefimtlOns and Storet Numbers 41 TotalPhosphorus(P)-aUofthephosphoruspresentmthesampleregardlessofform,as measured by the persulfate dIgestIOn procedure (00665) 4 1 1 Total Orthophosphate (P-ortho)-morgamc phosphorus [(P0 t3 4 measuredbythedIrectcolonmetncanalysIsprocedure (70507) Approved for NPDES, pendmg approval for SectIOn 304(h), CW A Issued 1971 EdItona1 reVISIOn 1974 and 1978 ] m the sample as 365 1-1 STORET NO. See Section 4PDF Image | Methods for Chemical Analysis of Water and Wastes
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