Methods for Chemical Analysis of Water and Wastes

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Methods for Chemical Analysis of Water and Wastes ( methods-chemical-analysis-water-and-wastes )

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7 Reagents 71 Ammomum molybdate-antimony potassmm tartrate solutIOn DIssolve 8 g of ammomum molybdate and 0 2 g antImony potassIUm tartrate m 800 ml ofdIstilled water and dIlute to 1 lIter 72 AscorbIc aCId solutIOn DIssolve 60 g of ascorbIc aCId in 800 ml of dIstIlled water and dIluteto1hter Add2mlofacetone ThISSolutIonISstablefortwoweeks 73 Sulfunc aCId, 11 N Slowly add 310 ml ofconc H2S04 to approxImately 600 ml dIstIlled water Cool and dIlute to 1000 ml 74 SodIUm bIsulfite (NaHS03) solutIOn DIssolve 52 g of NaHS03 m 100 ml of ION H2S04 75 Ammomum persulfate 76 Stock phosphorus solutIOn DIssolve 04393 g of predned (105°C for one hour) KH2P 04 mdIstIlledwateranddIluteto1000milOml= 01mgP 77 Standard phosphorus solutIOn Dilute 100 ml of stock phosphorus solutIOn to 1000 ml wIth dIstilled water 1 0 ml = 001 mg P Prepare an appropnate senes of standards by dIlutmg sUItable volumes of standard or stock solutIOns to 100 ml wIth dIstIlled water Procedure 8 8 1 Total Phosphorus 8 1 1 Transfer 50 ml of sample or an alIquot dIluted to 50 ml mto a 125 ml Erlenmeyer flask and add 1ml of 11 N sulfunc aCId (7 3) 8 1 2 Add 0 4 g ammomum persulfate (7 5), mIX and boll gently for approxImately 30-40 mmutes or untIl a final volume of about 10 mIlS reached Alternatively heat for 30 mmutes m an autoclave at 121°C (15-20 pSI) Cool, dIlute to approxImately 40 ml and filter 8 1 3 For samples contammg arsemc or hIgh levels of Iron, add 5 ml of sodIUm bIsulfite (7 4), mIX and place m a 95°C water bath for 30 mmutes (20 mmutes after the temperatureofthesamplereaches95°C) CoolanddIluteto50ml 8 1 4 Determme phosphorus as outlIned m (8 3) orthophosphate Hydrolyzable Phosphorus 8 2 1 822 8 2 8 3 Add 1ml ofH2S04 solutIOn (8 3) to a 50 ml sample m a 125 ml Erlenmeyer flask Boll gently on a pre-heated hot plate for 30-40 mmutes or untIl a final volume of about 10 mIlS reached Do not allow sample to go to dryness Alternatively, heat for 30 mmutes m an autoclave at 121°C (15-20 pSI) Cool, dIlute to apprOXImately 40 ml and filter Treatthesamplesasm813 Determme phosphorus as outlmed m (8 3) orthophosphate 823 8 2 4 Orthophosphate 8 3 1 To 50 ml ofsample and/or standards, add 1ml of 11 N sulfunc aCId (7 3) and 4 ml of ammomum molybdate-antimony potaSSIUm tartrate (7 1) and mIX NOTE: If sample has been dIgested for total or hydrolyzable phosphorus do not addaCId 8 3 2 Add 2 ml ofascorbIC aCId solutIOn (7 2) and mIX 3653-3

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