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

Liu Deshao 1,Guo Liping 2,Qing Changle 3 (1.Changqing Environmental Protection Bureau,Chongqing 400015; 2.Changqing Oil Higher Training School,Chongqing 400030; 3.Southwest Agricultural University,Chongqing 400716)  
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.
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