Division of Environmental Studies, College of Agriculture, Food Science, and Sustainable Systems, Kentucky State University, Frankfort, Kentucky 40601-2355, USA.
J Environ Sci Health B. 2013;48(3):219-25. doi: 10.1080/03601234.2013.730340.
Bioaccumulation and entry of trace elements from soil into the food chain have made trace-elements major environmental pollutants. The main objective of this investigation was to study the impact of mixing native agricultural soil with municipal sewage sludge (SS) or SS mixed with yard waste (SS+YW) compost on total concentration of trace elements in soil, metals available to plants, and mobility of metals from soil into peppers and melon fruits. Regardless of soil treatment, the average concentrations of Ni, Cd, Pb, Cr, Cu, Zn, and Mo in melon fruits were 5.2, 0.7, 3.9, 0.9, 34.3, 96.1, and 3.5μg g(-1), respectively. Overall concentrations of Ni, Cd, Pb, and Zn in melon fruits were significantly greater (P < 0.05) than pepper fruits. No significant differences were found in Cr, Cu, and Mo concentrations between pepper and melon fruits at harvest time. Total metal concentrations and metal ions in soil available to melon and pepper plants were also determined. Total concentration of each metal in the soil was significantly greater than concentration of metal ions available to plants. Elevated Ni and Mo bioaccumulation factor (BAF > 1) of melon fruits of plants grown in SS+YW mixed soil is a characteristic that would be less favorable when plants grown on sites having high concentrations of these metals.
生物蓄积和痕量元素从土壤进入食物链已使痕量元素成为主要的环境污染物。本研究的主要目的是研究将本地农业土壤与城市污水污泥（SS）或 SS 与庭院废物（SS+YW）混合堆肥混合对土壤中痕量元素总浓度、植物可用金属和金属从土壤向辣椒和甜瓜中迁移的影响。无论土壤处理如何，甜瓜果实中 Ni、Cd、Pb、Cr、Cu、Zn 和 Mo 的平均浓度分别为 5.2、0.7、3.9、0.9、34.3、96.1 和 3.5μg g(-1)。甜瓜果实中 Ni、Cd、Pb 和 Zn 的总浓度明显高于辣椒果实（P<0.05）。在收获时，辣椒和甜瓜果实中的 Cr、Cu 和 Mo 浓度没有差异。还测定了甜瓜和辣椒植物可用土壤中的总金属浓度和金属离子。土壤中每种金属的总浓度明显高于植物可用金属离子的浓度。在 SS+YW 混合土壤中生长的植物的甜瓜果实中 Ni 和 Mo 的生物积累因子（BAF>1）升高是一个特征，当植物在这些金属浓度高的地方生长时，这种特征不太有利。
