南京市郊区蔬菜重金属污染特征的研究

研究南京市郊区蔬菜中重金属的污染特征。采集了南京市8个不同方向郊区的菠菜、芹菜、蒜苗和油菜作为蔬菜样品,研究了Fe、Mn、Cu、Ni、Pb和Cd在蔬菜中的富集以及迁移情况。油菜中Fe和Pb的含量最高,分别为(359.95±196.2)和(2.08±1.05)mg/kg;而菠菜茎叶中的Cu、Mn和Cd含量最高,分别是(7.14±1.17),(68.51±31.14)和(0.55±0.15)mg/kg。菠菜和油菜对金属的富集浓度明显高于其他2种蔬菜。除了Mn的最大TC值(73%)出现在芹菜中外,其余金属的最大TC值均出现在菠菜中。蔬菜对金属的吸收具有选择性,因蔬菜的种类而异。Pb在蔬菜中由根部向茎叶迁移的能力明显高于其他5种金属,菠菜与其他几种蔬菜相比具有较强的将金属由根部向茎叶输送的能力,同种金属在蔬菜的不同部分的积累量不相同。

Research on Pollution Characteristics of Heavy Metal in Vegetable from Nanjing Suburb

The aim was to study the pollution characteristics of heavy metal in vegetable from Nanjing suburb.Spinach,celery,garlic sprouts and rape from suburbs in 8 different directions of Nanjing city were collected as vegetable samples.The enrichment and migration of Fe,Mn,Cu,Ni,Pb and Cd in vegetable were studied.Fe and Pb contents were highest in rape,being(359.95±196.2) and(2.08±1.05) mg/kg resp.;Cu,Mn and Cd contents were highest in spinach stem and leaves,being(7.14±1.17),(68.51±31.14) and(0.55±0.15) mg/kg resp.The metal enrichment concentrations of spinach and rape were obviously higher than that of the other two kinds of vegetable.The maximum TC values of the metals all appeared in spinach,except that the maximum TC value(73%) of Mn appeared in celery.The absorption of vegetable to metal had selectivity,and difference in different varieties of vegetable.The migration ability of Pb from roots to stem and leaves in vegetable was obviously higher than that of the other 5 metals.Compared with the other kinds of vegetable,spinach had stronger ability to transport metal from roots to stem and leaves.The accumulations of the same kind of metal in different parts of vegetable were different.