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8 PreclSlon and Accuracy ThIrty to thIrty two laboratones analyzed prepared samples of 0 64, 0 84 and 1 83 mg/1 The relatIve standard deviations were 27 0%, 32 4% and 23 6% respectively and relatIve errors were 23 6%, 18 5%, and 167% respectively In a smgle operator, smgle laboratory, situatIon the followmg results were obtamed Sample matnx DIstIlled Watera Dnnkmg Water RIver water Domestic Sewageb Raw sewage Average Standard mgll deVIation ±mgll 025 0001 402 003 068 004 030 003 111 006 048 009 ReI standard deViatIOn % 023 076 52 97 59 180 aThreerepJIcatesfordistilledwater SevenreplIcatesforothersamplematnces bSecondarytreatment BIbliography 1. Standard Methods for the ExammatlOn of Water and Wastewater, 14th ed p 316, Method 409A "Iodometnc Method I" (1975) 2. ASTM Standards, Part 31, "Water", p 276, Method D1253-76 (1976) 3 Bender, D F , "Companson of Methods for the DetermmatlOn of Total AvaIlable Residual Chlonne In Vanous Sample Matnces", EPA Report~600/4-78-019 330 3~4PDF Image | Methods for Chemical Analysis of Water and Wastes
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