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77 78 79 7 10 Ammomum persulfate AC1d wash water Add 40 ml ofsulfunc aC1d solutlOn (7 6) to I hter ofd1stilled water and dlluteto2hters (Nottobeusedwhenonlyorthophosphate1Sbemgdetermmed) Phenolphthalem mdlCator solutlOn (5 gil) D1ssolve 05 g of phenolphthalem m a solutlOn of 50 ml of ethyl or 1sopropyl alcohol and 50 ml of d1stilled water Stock phosphorus solutlOn D1ssolve 04393 g ofpre-dned (105°C for 1 hour) KH2P04 m d1stlliedwateranddlluteto1000milOml=0 1mgP 7 11 Standard phosphorus solutlOn D1lute 100 0 ml of stock solutlOn (7 10) to 1000 ml With d1stlliedwater 10ml=001mgP I 7 12 Standard phosphorus solutlOn Dllute 1000 ml of standard solutlOn (7 11) to 1000 ml w1thd1stilledwater 10ml=0001mgP 7 13 Prepare a senes of standards by d1lutmg sUitable volumes of standard solutlOns (7 11) and (7 12) to 1000 ml w1th d1stllied water The followmg dllutlOns are suggested ml of Standard Cone, Phosphorus SolutIOn (7 12) mg PII 00 000 8 Procedure 8 1 Phosphorus 8 1 1 Add 1ml ofsulfunc aC1d solutlOn (7 6) to a 50 ml sample andlor standard ill a 125 8 2 Hydrolyzable Phosphorus 821 Add 1 ml ofsulfunc aC1d solutlOn (76) to a 50 ml sample andlor standard m a 125 ml Erlenmeyer flask 8 1 2 8 1 3 8 1 4 8 1 5 ml Erlenmeyer flask Add 0 4 g ofammomum persulfate Boll gently on a pre-heated hot plate for approx1mately 30-40 mmutes or untll a final volume of about 10 ml 1S reached Do not allow sample to go to dryn~ss Alternately, heat for 30 mmutes m an autoclave at 121°C (15-20 pS1) Cool and dllute the sample to 50 ml If sample 1S not clear at th1s pomt, filter Determme phosphorus as outlmed m (8 3 2) w1th aC1d wash water (7 8) m wash tubes 20 50 100 ml of Standard Phosphorus Solution (7 11) 20 50 80 100 002 005 010 mg Pl1 020 050 080 100 365 1-5PDF Image | Methods for Chemical Analysis of Water and Wastes
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