大气和土壤对蔬菜汞的贡献

Contribution to vegetable mercury from atmosphere and soil.

通过田间观测和盆栽试验 ,研究了蔬菜富集Hg的特性及土壤、大气对蔬菜Hg的贡献 .对田间 11种蔬菜的研究发现 ,蔬菜根和叶的含Hg浓度高于茎和果 ;在自然条件下 ,蔬菜所吸收的Hg 6 0 %以上分布于地上部的可食部分 .盆栽试验结果表明 ,在气Hg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Hg浓度超过了食品卫生标准 ;气Hg、土壤Hg对蔬菜Hg的贡献率分别为 70 4 %～ 90 7%和9 3%～ 2 9 6 % 。

In this research,the characteristics of Hg accumulation in vegetable 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 in stems and fruits.In the natural condition,more than 60% of the assimilated Hg was 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 atmospheric Hg content reached 57\^6±14\^7 ng·m\+\{-3\}. This result indicted that the contribution of atmosphere and soil to vegetable Hg were 70\^4～90\^7% and 9\^3～29\^6% respectively. So, the vegetable Hg was affected mainly by atmosphere Hg.