Heavy metals accumulation of food-crops grown in agricultural areas affected by industrial wastewater, Da Nang, Vietnam

Tóm tắt

Heavy metal pollution of agricultural soils resulting from wastewater irrigation has been causing major concern due to the potential risk involved. In the present study,food-crops (Chrysanthemum coronarium; Ocimumbasilicum; Coriandrumsativum), irrigation water, and corresponding agricultural soil were assessed for Pb and As contamination. Study results reveal that contents of Pb and As in agricultural soils are lower than their permissible values in comparison with Vietnam technical regulations on the allowable limits of heavy metals for agricultural soils. By contrast, the concentration of Pb and As in water samples are higher than its allowable level for irrigation water. Besides, most of As values in food-crops grown surrounding Hoa Khanh IZ are lower than its permissible level in vegetables. Meanwhile, a vast fraction of Pb contents in food-crops have exceeded its allowable level for both leafy and spice vegetables. The associated risk was assessed using HI index. The results indicate that there is a health risk associated with the ingestion of contaminated food-crops (HI > 1).