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73 If femc Iron IS present (100 to 200 mg/1), add 10 ml of KF (65) solutIOn before aCIdIficatIOn 74 OccasIonally, a dark brown or black precIpItate persIsts In the bottle after aCIdicatlOn ThIS preCIpItate w111 dIssolve lithe solutIOn IS kept for a few mInutes longer than usual or, Ifpartlcularly persIstent, a few more drops ofH2S04 wIll effect dISsolutIOn 8. CalculatIon 8.1 Each ml of 0 0375N sodIUm thIOsulfate (or P AO) tItrant IS eqUIvalent to 1 mg DO when the entIre bottle contents are tItrated I 82 lfthe results are desIred In mIllIlIters ofoxygen gas per lIter at O°C and 760 mm pressure multIply mg/1 DO by 0 698 83 To express the results as percent saturatIon at 760 mm atmosphenc pressure, the solubIlIty data In Table 4221 (WhIpple & WhIpple, p 446-447, Standard Methods, 14th EdItIOn) may be used EquatIOns for correctIng the solubIlItIes to barometrIc pressures other than mean sea level are given below the table 84 The solubIlIty of DO In dIStl1led water at any barometrIc pressure, p (mm Hg), temperature, TOC, and saturated vapor pressure, u (mm Hg), for the gIven T, may be calculated between the temperature of0° and 30°C by and between 30° and 50°C by mIll DO = (P - u) x 0 678 35 + T mIll DO = (P - u) x 0 827 49 + T 9 PrecISIon and Accuracy 9 1 Exact data are unavaIlable on the preCISIOn and accuracy of thIS techmque, however, reprodUCIbIlIty IS approXImately 0 2 mg/l of DO at the 7 5 mg/1 level due to eqUIpment tolerances and uncompensated dIsplacement errors BIbliography 1 Kroner, R C, Longbottom, J E, Gorman, R A, "A ComparIson of VarIOUS Reagents Proposed for Use In the WInkler Procedure for DIssolved Oxygen", PHS Water PollutIon SurveIllance System ApplIcatIOns and Development, Report # 12, Water QUalIty SectIOn, BaSIC Data Branch, July 1964 2. Annual Book of ASTM Standards, Part 31, "Water", Standard 01589-60, Method A, p 373 (1976) 3. Standard Methods for the ExamInatIOn ofWater and Wastewater, 14th EdItIOn, p 443, method 422 B(1975) 3602-4PDF Image | Methods for Chemical Analysis of Water and Wastes
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