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7. Calculations mg/l CI = 8 where A = mlOOO564NPAO B= mlO0282N12 C = mlsample PreclSlon and Accuracy 8 1 Sample Matnx Starch-Iodme Endpomt 8 1 1 PreCISIOn Distilled Waters Dnnkmg Water RIver Water Domestic Sewageb Raw Sewage Average Stand Dev mg/1 ±mg/l 041 005 351 012 084 004 084 002 087 007 055 009 ReI Stand Dev % 122 33 43 27 76 160 (A- 5B)x200 C In a smgle operator, smgle laboratory SituatIOn the followmg results were obtamed aThreereplIcatesfordistIlledwater SevenreplIcatesforothersamplematrIces bSecondary treatment Iodometnc Sample Matnx Drmkmg W ater RIver Water DomestIc Sewage Raw Sewage Starch TItratIOn mgll 0 8 5 078 100 IodIde Back TItratIOn % mg/I Recovery 084 988 084 1077 087 870 8 1 2 Accuracy (Relative) For four samples the results were compared to the lodometnc titratIOn as a means ofobtalmng a relative accuracy Approx 05 055 Approx 100 0 8 2 Amperometnc End Pomt 8 2 1 PreclSlon In a smgle operator, smgle laboratory SituatIOn the followmg results were obtamed 3302-4 I"PDF Image | Methods for Chemical Analysis of Water and Wastes
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