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7. kept covered untIl needed agaIn If thIS IS done, the treatment WIth 1 1 HCl and reagents ISonlyreqUiredoccasIOnally CommercIaldetergentsshouldneverbeused Reagents 7 1 72 73 74 75 76 77 78 7 9 SulfUrIC aCId solutIOn, 5N DIlute 70 ml ofconc H2S04WIth dIstilled water to 500 ml Antimony potasSIUm tartrate solutIOn WeIgh 1 3715 g K(SbO)C4H40 6-1/2H20, dIssolve In 400 ml dIstIlled water In 500 ml volumetnc flask, dIlute to volume Store at 4°C In a dark, glass-stoppered bottle AmmOnIum molybdate solutIOn DIssolve 20 g(NH4)6Mo7024-4H20 In 500 m1 of dIstIlled water StoreInaplasticbottleat4°C AscorbIc aCId, 0 1M DIssolve 1 76 g of ascorbIC aCId In 100 ml of dIStilled water The solutIon IS stable for about a week Ifstored at 4°C CombIned reagent MIX the above reagents In the follOWIng proportions for 100 ml ofthe mIxed reagent 50 ml of 5N H2S04, (7 1), 5 ml of antimony potassIUm tartrate solutIOn (7 2), 15 ml of ammOnIum molybdate solutIOn (7 3), and 30 ml of ascorbIc aCId solutIOn (74) MIX after addItion of each reagent All reagents must reach room temperature before they are mIxed and must be mIxed In the order gIven If turbIdIty forms In the combIned reagent, shake and let stand for a few mInutes untIl the turbIdIty dIsappears before proceedIng SInce the stabIlIty of thIS solutIOn IS lImIted, It must be freshly prepared for each run Sulfunc aCId solutIOn, 11 N Slowly add 310 ml conc H2S04to 600 ml dIstIlled water When cool, dIlute to 1 lIter AmmOnIum persulfate Stock phosphorus solutIOn DIssolve In dIstIlled water 0 2197 g of potassIUm dihydrogen phosphate, KH2P04, whIch has been dned In an oven at 105°C DIlute the solutIOn to lOOOml, 1 Oml = 005 mgP Standard phosphorus solutIOn DIlute 10 0 ml ofstock phosphorus solutIOn (7 8) to 1000 ml WIth dIStilled water, 1 0 ml = 0 5 ug P 7 9 1 USIng standard solutIOn, prepare the follOWIng standards In 50 0 ml volumetnc flasks ml of Standard Phosphorus SolutIOn (7 9) o 10 30 50 100 200 300 400 500 Cone, mg/1 000 001 003 005 010 020 030 040 050 7 10 SodIUm hydroxIde, 1 N DIssolve 40 g NaOH In 600 ml dIStilled water Cool and dIlute to 1lIter 3652-4PDF Image | Methods for Chemical Analysis of Water and Wastes
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