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1 2 3 4 5 Scope and ApplicatIon I 1 ThIS method IS applicable to dnnkmg, surface and saline waters, sewage and mdustnal waste effluents 1 2 The concentratIOn range for thIS method IS 2-20 mg/l ofIodIde Summary ofMethod 2 1 After pretreatment to remove mterferences, the sample IS analyzed for IOdIde by convertmg the IOdIde to Iodate wIth bromme water and tttratmg wIth phenylarsme oXIde (PAO) or sodmm thIOsulfate Sample Handling and PreservatIOn 3 I Store at 4°C and analyze as soon as pOSSIble Interferences A 1 42 Iron, manganese and orgamc matter can mterfere, however, the calcmm OXIde pretreatment removes or reduces these to mSlgmficant concentratIOns Color mterferes WIth the observatIOn of mdlcator and bromme-water color changes ThIS mterference IS ehmmated by the use of a pH meter mstead of a pH mdlcator and the use of standardIzed amounts of bromme water and sodmm formate solutIOn mstead of observmg the hght yellow color changes Reagents 5 1 5 2 5 3 5 4 5 5 56 5 7 58 59 AcetIC ACId SolutIOn (1 8) MIX 100 ml of glaCIal acetIC aCId WIth 800 ml of dlsttlled water Bromme Water In a fume hood, add 0 2 ml bromme to 500 ml dlsttlled water Stir WIth a magnetIC stIrrer and a Teflon-coated stlrnng bar for several hours or untl1 the bromme dIssolves Storemaglass-stopperedcoloredbottle Calcmm OXIde (CaO) Anhydrous, powdered Potassmm IodIde (KI) Crystals, ACS Reagent Grade Sodmm Acetate SolutIOn (275 gil) DIssolve 275 g of sodmm acetate tnhydrate (NaC2H302-3H20)mdlstl1ledwater Dl1uteto1hterandfilter Sodmm Formate SolutIOn (500 gil) DIssolve 50 g ofsodmm formate (NaCH02) m hot dlstl1led water and dl1ute to 100 ml NItrogen Gas Cyhnder Sulfunc ACId SolutIOn (14) Slowly add 200 ml of H2S04 (sp gr 1 84) to 800 ml of dlstdled water Phenylarsme OXIde (00375 N) Hach ChemIcal Co or eqUlvalent StandardIze With 00375 N potassmm buodate (5 15,5 18) Issued 1974 IODIDE Method 345.1 (Titrimetric) 345 1-1 STORET NO. 71865PDF Image | Methods for Chemical Analysis of Water and Wastes
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