蔬菜对大气汞和土壤吸收的研究

Study on the Contribution of Mercury from Atmosphere and Soil to Vegetalde

通过田间观测和盆栽试验研究了蔬菜富集汞的特性及土壤、大气对蔬菜汞的贡献。对田间 11种蔬菜的研究发现 ,蔬菜根和叶的含汞浓度高于茎和果 ;在自然条件下 ,蔬菜所吸收的汞 60 %以上分布于地上部的可食部分。盆栽试验结果表明 ,在气汞浓度为 5 7.6± 14.7ng· m- 3条件下 ,红萝卜、莴苣叶 (可食部分 )的含汞浓度超过了食品卫生标准 ;气汞、土壤汞对蔬菜汞的贡献率分别为 70 .4～ 90 .7%、9.3～ 2 9.6% 。

In this research the characteristics of vegetable accumulation Hg and the contribution of atmosphere and soil to vegetable Hg were studied by field observation and pot experiments.11 kinds of vegetable were experimented in field,The results indicated that the Hg contents in roots and leaves of vegetables were higher than that of stems and fruits.Naturally more than 60% of the assimilated Hg distributed in the up-ground edible parts.The results of pot experiments showed that the Hg content of the edible parts of carrot and lettuce exceeded the Food Heath Standard Value(FASV),when the atmosphere Hg content reached 57.6±14.7ng·m -3.This research indicted that the contribution of atmosphere and soil to vegetable Hg were 70.4%～90.7% and 9.3%～29.6% respectively.So the results showed that the vegetable Hg are affected mainly by atmosphere Hg.