Experimental Study on Phytoremediation of Soil Mercury Pollution in Xinhuang Mercury Mining Area
Aiming at the problem of soil mercury pollution in Xinhuang Mercury Mine in Hu'nan Province,a combined remediation experi-ment of soil mercury pollution by native plants and chelating agents was carried out to study the effect and mechanism of mercury removal by native plants and plant-chelating agents,and to provide technical support for phytoremediation of soil mercury pollution.On the basis of field investiga-tion,artemisia lavandulaefolia,bidens pilosa,pteris vittata and rubus mongolicus were selected for indoor planting experiment,and oxalic acid,cit-ric acid and malic acid were used as chelating agents.The growth status of plants,environmental temperature,soil pH value and soil mercury con-tent were monitored regularly,and the mercury enrichment ability of various plants was evaluated by comparing the mercury enrichment coefficient and mercury transport coefficient.The results showed that under the condition of planting a single plant,the enrichment and tran sportation ability of each plant to mercury was pteris vittata>artemisia lavandulaefolia>rubus mongolicus>bidens pilosa.After adding chelating agent,the combi-nation of rubus+7.5 mmol/L oxalic acid,bidens+7.5 mmol/L citric acid and bidens+7.5 mmol/L malic acid was the best.Comprehensive analysis shows that under the condition of single plant,pteris vittata can be used as the preferred plant for soil mercury pollution remediation.Pteris vittata+2.50 mmol/L oxalic acid,pteris vittata+2.5 mmol/L citric acid and rubus mongolicus+7.5 mmol/L oxalic acid can be used as a combination tech-nology for soil mercury pollution remediation.
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