Trace element content and food safety of water spinach (Ipomoea aquatica Forssk.) cultivated with wastewater in Hanoi, Vietnam
Elemental concentrations were determined in water spinach and soil samples from exposed and non-exposed production sites in Hanoi. The results indicated that there was no clear effect of wastewater use on the elemental concentrations in soil and water spinach. Maximum site concentrations of As, Cd, Cr, Cu, Fe, Mn, Ni, Pb and Zn in water spinach were 0.139, 0.0320, 0.135, 2.01, 39.1, 55.5, 0.16, 0.189 and 6.01mg·kg<1> fresh weight (f. w. ), respectively. The estimated average daily in take of As, Cd, Cu, Fe, Pb and Zn for adult Vietnamese consumers amounts to<11％ of the maximum tolerable intake proposed by WHO for each element. It is assessed that the occurrence of the investigated elements in water spinach will pose low health risk for the consumers. Mean soil concentrations for selected potentially toxic trace elements at the studied field sites were 9.11-18.7 As, 0.333-0.667 Cd, 10.8-14.5 Co, 68-122 Cr, 34.0- 62.1 Cu, 29.9-52.8 Ni, 32.5-67.4 Pb, 0.578-0.765 Tl and 99-189 Zn mg·kg<1> dry weight (d. w. ). At all sites Cd, Pb and Zn soil concentrations were below the Vietnamese Guideline Values for agricultural soils whereas As and Cu exceeded the guideline values.
Elements food safety Hanoi wastewater water spinach wetland
H. Marcussen P. E. Holm K. Joergensen A. Dalsgaard
Departments of Natural Sciences Faculty of Life Sciences, University of Copenhagen, Thorvaldsensvej Departments of Veterinary Pathobiology , Faculty of Life Sciences, University of Copenhagen, Thorval
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
87-88
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）