Bhatia Arti, Singh ShivDhar, Kumar Amit
Centre for Environment Science and Climate Resilient Agriculture, Indian Agricultural Research Institute, New Delhi, India.
Water Environ Res. 2015 Nov;87(11):2027-34. doi: 10.2175/106143015X14362865226833.
Dietary exposure to heavy metals, namely cadmium (Cd), lead (Pb), zinc (Zn), and copper (Cu), has been identified as a risk to human health through consumption of vegetable crops. The present study investigates heavy metal contamination in irrigation water, soil, and vegetables at four peri-urban and one wholesale site in Delhi, India, and estimates the health risk index. Most of the samples collected from peri-urban areas exceeded the safe limits of lead and cadmium, whereas only lead concentration was found to be higher in vegetable samples collected from the wholesale market. Average uptake of metals by vegetables from soil decreased in the order Cd>Zn>Cu>Pb. The order of metal uptake based on transfer factor was highest in okra, cauliflower, and spinach, from greatest to least. Among the vegetables from peri-urban sites, only okra crossed the safe limit for cadmium; whereas vegetables from the wholesale site exceeded the limit for lead (potato, coriander, chilies, pea, and carrot, in order from greatest to least) with respect to health risk index.
通过食用蔬菜作物，膳食中接触重金属，即镉（Cd）、铅（Pb）、锌（Zn）和铜（Cu），已被确定为对人类健康的一种风险。本研究调查了印度德里四个城郊地区和一个批发市场的灌溉水、土壤和蔬菜中的重金属污染情况，并估算了健康风险指数。从城郊地区采集的大多数样本超过了铅和镉的安全限值，而从批发市场采集的蔬菜样本中仅发现铅浓度较高。蔬菜从土壤中吸收金属的平均量按镉>锌>铜>铅的顺序递减。基于转移因子的金属吸收顺序在秋葵、花椰菜和菠菜中最高，从高到低排列。在城郊地区的蔬菜中，只有秋葵的镉含量超过了安全限值；而从批发市场采集的蔬菜，就健康风险指数而言，超过了铅的限值（土豆、香菜、辣椒、豌豆和胡萝卜，从高到低排列）。
