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Quant presentation - => 2S4O62-(aq) + 6 I-(aq)...

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Click to edit Master subtitle style 2/10/10 Analysis of Dissolved Oxygen Concentration in Water Samples Mark E. Ziffer and Mengfei Zhang October 29th, 2009
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2/10/10 The Winkler Method l 8 OH-(aq) + 4 Mn2+(aq) + O2(aq) + 2 H2O (l) => 4 Mn(OH)3(s) l 4 Mn(OH)3(s) + 6 I-(aq) + 12 H+(aq) => 2I3-(aq) + 6 H2O(l) + 4 Mn2+(aq) l 4 S2O32-(aq) + 2I3-(aq)
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Unformatted text preview: => 2S4O62-(aq) + 6 I-(aq) 2/10/10 Sample collection and treatment l Reagents used in the field: MnSO4, KI-NaOH, and concentrated H2SO4 solution 2/10/10 Analysis in lab l Standardization of titrant Na2S2O3 with prepared I3- solution l Titration of samples l 4 S2O32-(aq) + 2I3-(aq) => 2S4O62-(aq) + 6 I-(aq) 2/10/10 Results...
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