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In a smgle laboratory, smgle operator situatIOn the followmg results were obtamed Sample Matnx Distilled Watera Drmkmg Water River Water Domestic Sewage A verage Stnd Devd mg/l ±Img/l 039 0012 361 011 094 0008 086 002 107 003 ReI Stnd Dev" % 3 1 32 08 19 24 aThree repltcates for distilled wat~r Seven repltcates for other samples For three samples the results were compared to the lodometnc titratIOn as a means of obtalmng a relative accuracy Sample Matnx Dnnkmg Water River Water Domestic Sewage Iodometnc DPD TitratIOn Colonme- mg/l tnc mgll 086 094 070 086 101 107 Bibliography % Recoyery 1093 1229 1060 1 Standard Methods for the ExammatIOn of Water and Wastewater, 14th Ed, Pg 332, Method 409F, "DPD ColonmetncMethod", (1975) 2 Bender, D F , "Companson of Methods for the Determination of Total Available Residual Chlonne m Vanous Sample Matnces", EP A Report-600/4-78-O19 3305-3PDF Image | Methods for Chemical Analysis of Water and Wastes
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