RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2008, Vol. 17 >> Issue (1): 143-143.

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EFFECT OF SAMPLE PRETREATMENT ON DETERMINATION OF PERMANGANATE INDEX IN WATER

LOU Baofeng1| CHEN Yongbo2|3| WENG Lida4| ZANG Xiaoping1| SHU Jinxiang1| SONG Jiangying1| LIU Cheng1   

  • Received:1900-01-01 Revised:1900-01-01 Online:2008-01-20

Abstract:

The effect of sample pretreatment on determination of permanganate index in the Yangtze River water of Three Gorges Reservior Section was studied.It is found that the content of suspended solids (〖WTBX〗SS〖WTBZ〗) was the major factor leading to the difference in determination of permanganate index in various pretreated water samples.The empirical relationship of the differences was obtained using nonlinear regression method and verified with the determined data.Results showed that the values calculated from empirical equations coincided well with the determined values.The distribution of organic substances corresponding to permanganate index—OS(CODMn) as a whole between water phase and solid phase，as well as between coarse particles and fine particles in overlying water can be calculated using the empirical equations.The proportions of dissolved OS(CODMn)，particulate OS(CODMn)，and OS(CODMn) existing in the coarse or fine particles changed significantly with the content of 〖WTBX〗SS〖WTBZ〗.When 〖WTBX〗SS〖WTBZ〗 exceeded 1 000 mg/L，over 80% of OS(CODMn) existed in suspended solids，and over 60% of OS(CODMn) can be removed during 30min settlement.

Key words: water sample pretreatment, permanganate index, effect, empirical relationship

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