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BROMIDE Method 320.1 (Titl'imetric) 1 Scope and ApplIcatlOn 1 1 This method IS applIcable to drmkmg, surface, and salme waters, domestic and mdustnal waste effluents 1 2 The concentratlOn range for this method IS 2-20 mg bromlde/l 2 Summary of Method 21 After pretreatment to remove mterferences, the sample IS divided mto two alIquots One alIquot IS analyzed for Iodide by convertmg the Iodide to Iodate with bromme water and tltratmg lOdometncally with phenylarsme oXide (PAO) or sodIUm thiosulfate The other alIquot IS analyzed for lOdlde plus bromide by convertmg these hahdes to Iodate and bromate with calcIUm hypochlonte and tltratmg lOdometncally with PAO or sodIUm thiosulfate BromideISthencalculatedbydifference 3 Sample Handhng and PreservatlOn 3 1 Store at 4°C and analyze as soon as possible 4 Interferences 41 Iron, manganese and orgamc matter can mterfere, however, the calCIUm OXide pretreatment removes or reduces these to mSlgmficant concentratlOns 42 Color mterferes with the observatlOn of mdlCator and bromme-water color changes ThiS mterference IS elImmated by the use of a pH meter mstead of a pH mdlcator and the use ofstandardized amounts ofoXidant and oXldant-quencher 5 Reagents 51 AcetiC ACid SolutlOn (1 8) MIX 100 ml of glaCial acetic aCid with 800 ml of distilled water 52 Bromme Water In a fume hood, add a2 ml bromme to 500 ml distilled water Stir with a magnetic strrrer and a Teflon-coated stlrnng bar for several hours or untl1 the bromme dissolves Storemaglass-stoppered,coloredbottle 53 CalCIUm Carbonate (CaC03) Powdered 54 CalCIUm Hypochlonte SolutlOn (Ca(OCI)2)' Add 35 g of Ca(OCI)2 to approximately 800 ml of dlstl1led water m a l lIter volumetnc flask Stir on a magnetic stirrer for approximately 30 mmutes Dl1ute to 1 hter and filter Store m a glass-stoppered, colored flask 55 CalcIUm OXide (CaO) Anhydrous, powdered 56 Hydrochlonc ACid SolutlOn (14) MIX 100 ml of HCI (sp gr 1 19) With 400 ml of dlstl1led water Approved for NPDES Issued 1974 3201-1 STORET NO. 71870PDF Image | Methods for Chemical Analysis of Water and Wastes
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