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Le Thi Phuong Quynh, Ho Tu Cuong, Duong Thi Thuy, Nguyen Thi Bich Ngoc, Nguyen Duy An, Pham Quoc Long, Seidler Christina (2014).

Water quality of the Red River system in the period 2012 – 2013Journal of Vietnames Environment, Vol. 6(3), pp. 191-195 DOI: 10.13141/jve.vol6.no3.pp191-195

Few data are available on the quality of Red river water that is used for multi-purposes, includingfor domestic water demand in some rural areas. This paper presents the observation results of theRed River water quality in two years 2012 and 2013. The monitoring results showed that the aver-age concentrations of nutrients (N, P) were still far lower than the allowed value of the Vietnamesestandard limits for surface water quality (QCVN 08:2008/BTNMT, column A2). Due to the im-poundment of two big dams in the Da tributary, the suspended solids contents in river water de-creased remarkably. The dissolved heavy metal (DHM) concentrations varied in a high range: Cu: 10 – 80 µg.l-1; Zn: 2 – 88 µg.l-1; Cr: 0.2 – 5.1 µg.l-1; Pb: 2 - 107 µg.l-1; Cd: 2 – 12 µg.l-1; Mn: 2 – 35 µg.l-1; and Fe: 160 – 2370 µg.l-1. Most of the mean values of DHM were lower than the allowed values of the QCVN 08:2008/BTNMT, but at several points of time, several DHM (e.g. Fe, Cd, Pb) contents exceeded the allowed values. The Total Coliform (TC) and Fecal Coliform (FC) den-sities varied in a high range: TC: 23 to 13,000MPN.100ml-1 and FC: 0 to 1,600MPN.100ml-1 andthey exceeded the allowed values QCVN 08:2008/BTNMT at several points observed. The dis-solved organic carbon (DOC) contents were in low level and the particulate organic carbon (POC) content mainly derived from soil organic leaching and erosion in the basin. The results underlined the need for regularly monitoring the river water quality, and there should be some effective solu-tions to manage and treat the waste sources in order to provide safe water for different actual pur-poses use in the Red River basin.
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