PRELIMINARY ASSESSMENT OF DISSOLVED AND PARTICULATE HEAVY METALS TRANSPORTED BY THE RED RIVER AT THE SONTAY STATION
Keywords:Red River, heavy metal contamination, water quality, ecological indicator, flux
This study is based on the experimental results obtained from analysis of suspended and dissolved heavy metal
concentrations (V, Cr, Co, Ni, Cu, Zn, As, Mo, Cd, Sb, Pb and Th) in the Red River at the SonTay station during 2011.
The results showed that for the dissolved phase, heavy metal concentrations were relatively stable, whatever the water
discharges. In contrast, the concentration of suspended heavy metals tended to decrease with increasing of water discharge. Moreover, the results indicated also that the transfert of heavy metals by the Red River was mainly in the suspended phase (up to 99 %). If the water quality of the Red River can be classified as good (column A - QCVN08: 2008/BTNMT) in term of dissolved heavy metal concentrations; the suspended heavy metal concentrations were higher than the ecological indicators PEC (Probable Effect Concentration), suggesting the effect of this heavy metal
contamination on the ecology and environment in the Red River basin is extremely high (over 50% ). Finally, this study estimated the contribution of the Red River on the global flux from 0.1 to 0.4% for dissolved phase and from 0.4% to 2.2 for suspended phase.
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