Đánh giá hàm lượng kim loại nặng trên một số loại rau ở khu vực huyện Bình Chánh, thành phố Hồ Chí Minh

Abstract

The concentrations (mg/kg) of As, Cd, Cu, Cr, Ni, Pb and Zn were determined in three different vegetables which were obtained from Binh Chanh district using Atomic Absorption Spectrophotometry (AAS). Samples were collected during both dry and rainy seasons. The mean levels of heavy metals obtained ranged widely from 0.007 mg/kg for Cd to 32.27 mg/kg for Zn. The relative abundance of heavy metals in Brassica analyzed followed the sequence Zn > Cu> Ni > As > Pb > Cr > Cd, in Ipomoea aquatica analyzed followed the sequence Zn > Cu > Cr > Ni > As > Pb > Cd and in Neptunia oleracea analyzed followed the sequence Zn > Cu > Ni > Cr > As > Pb > Cd. Concentrations of heavy metals in vegetable samples were related to their concentrations in the corresponding soils. Concentrations of Cu in Neptunia oleracea and irrigation water in this study were higher than the allowable limits of Vietnam 1.064 and 1.12 times, respectively. Concentrations of Cd, Cr and Ni in vegetable samples were related to their concentrations in the corresponding soil and irrigation water.