Received: 07-12-2020
Accepted: 15-04-2021
DOI:
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Assessment of Heavy Metal Accumulation in some Leaf Vegetables under the Effects of Irrigation Water
,
Nguyen Van Dung
3
,
Nguyen Thi Hang Nga
4
,
Ngo Thi Dung
2
Keywords
Leafy vegetables, accumulation of heavy metals, irrigation water
Abstract
This study was conducted from September to November of 2019 and 2020 to evaluate the heavy metal accumulation and health risks of the irrigated leafy vegetables Brassica juncea L,Basella alba L,Lactuca sativagrown from other sources along Cau Bay river, the section flowing through Da Ton commune, Gia Lam district, Hanoi. The contents of heavy metals (Cd, Pb, Cu, Zn) in water samples, soil samples and vegetable samples were determined with methods of atomic absorption spectroscopy (AAS). The analysis results showed that the productivity of leafy vegetables was increased when the water of Cau Bay river was used for irrigation together with increased accumulation of heavy metals in soil and vegetables compared to the vegetables irrigated with groundwater. Cd content in all 3 types of vegetables exceeded the allowable limit level, of which the accumulation of Cd and Pb in Brassica junceaL were higher than in Basella alba Land Lactuca sativa. However, the Cu, Zn contents were still at a safe level according to QCVN 8-2: 2011/ BYT and Decision 106/2007/QD-BNN. As the results showed the health risk index (HRI) and the target hazard quotient (THQ) when consuming 3 vegetables in this case are currently at the safe threshold.
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