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《ACTA SCIENTIAE CIRCUMSTANTIAE》 1995-02
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DEPRESSION OF SOIL MERCURY ENTERING TERRESTRIAL FOOD CHAIN

Qing Changle;Mou Shusen(Southwest Agricultural University,Chongqing 630716)  
The influences of bentonite,humus and CaCO_3 on transformation of mercury in soilwere investigated. The results showed that bentonite, humus, and CaCO_3 are able to stimu-late the transformation of Hg from ion to other bonding forms and consequently depress ad-sorption of Hg by plant. Bentonite depressed the Hg adsorption linearly correlated with itscontent within a range of 0─450 g/kg.Humus competed with soil clay for Hg ̄(2+) and the re-lation of content-response correlated with clay content of the sample. CaCO_3 was effective todepress plant Hg uptake from soil under certain conditions.The mechanism of CaCO_3 issomewhat similar to that of bentonite.
【Fund】: 国家教委基金
【CateGory Index】: X506
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