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7 CalculatIons 8. IodIde PreCISIon and Accuracy 81 In a SIngle laboratory (EMSL), USIng a mIxed domestIC and IndustrIal waste effluent, at concentratIOns of0 3,28,53, 10 3 and 20 3 mg/1 of bromIde, the standard deVIatIons were ±O13, ±O37, ±O38, ±O44and ±O42mg/I,-respectlvely 82 In a SIngle laboratory (EMSL), USIng a mIXed domestIC and industrml waste effluent, at concentratIons of2 8, 5 3, 10 3 and 203 mg/l ofbronude, recoverIes were 96,83,97 and 99%, respectIvely 6 4 TItratIOn 64 1 DIssolve approXImately 1 g potassmm IOdIde (57) In sample from (62 8 or 63 10) Add 10 ml ofH2S04 solutIon (5 12) and place In dark for 5 mInutes 642 TItrate wIth standardIzed phenylarsIne oXIde workIng standard (5 14) or sodmm I, thIosulfate workIng standard (5 18), addIng IndIcator (5 15 or 520) as. end POInt IS approached (lIght straw color) TItrate to colorless solutIOn DIsregard returnIng blue color 7 1 7 2 PnncIple IodIde IS determIned by the tItratIOn of the sample as oXIdIzed In (62) bromIdeplusIodIdeISdetermInedbythetItratIOnofthesampleasOXIdIzedIn(63) The amountofbronudeISthendetermInedbydIfference ThenumberofeqUIvalentsofIodIne produced a constant of 13,320 as shown In the equatIOn In (72) ExperImental data IS entered In the approprIate place and the equatIOn IS solved for mg/I bromIde EquatIon Br(mg/l) ~13,320 [ ( A ~B ) _ ( D ; E ) ] where A = the number ofml ofPAO needed to tItrate the sample for bromIde plus IodIde (WIth the number ofml ofP AO needed to tItrate the blank subtracted) B = the normalIty of the P AO needed to tItrate the sample for bromIde plus IodIde C = the volume of sample taken (100 ml or a fractIOn thereof) to be tItrated for bromIde plus IodIde D = the number of ml of P AO needed to tItrate the sample for IOdIde (WIth the number of ml of PAO needed to tItrate the blank subtracted) The blank for the IOdIde tItratIOn IS often zero E = the normahty of the P AO used to tItrate the sample for IOdIde F = the volume of sample taken (100 ml or a fractIon thereof) to be tItrated for 320 1-4 11IIII 11PDF Image | Methods for Chemical Analysis of Water and Wastes
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