Pollution of water and agricultural soils in Tuliem and Thanhtri districts of Hanoi city, Vietnam - a report
1998
Tra, H.T.L. (Kyushu Univ., Fukuoka (Japan). Faculty of Agriculture) | Manh, N.D. | Hai, D.N. | Egashira, K.
Limited information is available on the quality of water and agricultural soils in Tuliem and Thanhtri districts of Hanoi city. Based on the Vietnam standard for the quality of water and soil, 14 water and 22 soil samples in Thanhtri district, and 7 water and 14 soil samples in Tuliem district were collected and analyzed for the prescribed parameters. In comparison with the Vietnam standard for the quality of water and soils, quality of water and soils in Tuliem and Thanhtri districts was evaluated. Quality of water as agricultural use was as follows: pH was neutral; EC was between 0.18 and 0.59 dS/m; COD was below the limit; no sample was over the limit value for Zn, but one, three and two samples exceeded the limit values for Cu, Pb and Cd, respectively. Quality of agricultural soils was as follows: pH ranged from 5.40 to 7.00; all soil samples showed total N content below 0.25% and available P2O5 more than 20 mg/kg; contamination of several heavy metals was indicated in soils around the manufacturing factory and in mud of the river bed, while contamination by Cu was in soil affected by agricultural chemicals
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