Dianchi Lake Water Hyacinth Enrichment Of Arsenic, Lead And Cadmium In Simulation Studies

With the in-depth study of water hyacinth at home and abroad, the enrichment and tolerance to heavy metal of water hyacinth had got more and more attention. The ability to propagate is one of characteristics to the water hyacinth. Making use of its big haracteristic floating of living beings amount could remove large of heavy metals from water body and get rid of secondary pollution. Dian had been polluted seriously by arsenic, lead, cadmium and other heavy metals.Through "soaring" of water hyacinth to enrich and remove heavy metals in water body is an effective method.So in this paper studying on the shape of enriching in arsenic, lead, cadmium and other heavy metal in the water hyacinth to provide certain theory basis for further research on purification of entropic water body.In China, a large number of non-cultivated land that is polluted by the heavy metal, for example industrial and mining land and urban land.have affected directly the health of agricultural products quality and environmental quality of groundwater, surface water, atmospheric and has caused great harm agricultural production, living and human health Especially after China accessed to the WTO, the heavy metals exceeded in agricultural products, so it have impacted on China's agriculture. Therefore, the heavy metal pollution is the task of China's current need to be resolved.In recent years the management strength in Yunnan Dianchi have increased,the water quality has also improved, but it's still in inferior Vclass. Heavy metals that enter in the water body of the lake was suspended by SS and sediment sorption, it purificated of overlying water on some exten. But the adsorption capacity of the sediment decided in the maximum adsorption capacity of sediments,so it's limited, and the maximum adsorption capacity of sediment depended mainly on the mineral composition, particle size and organic matter content for various Organic matter of sediment. Heavy metal that was adsorpted by sediment could be released again in certain conditions,than it caused secondary pollution. Therefore the Dianchi heavy metal pollution was in urgent need of an effective solution. Analyzing the experiment, had obtained the enrichments quantity and the enrichments shape of water hyacinth to heavy metal (arsenic, lead, cadmium). Put in1.0mg/L separately of the Dian water hyacinth (As3+, Pb2+, Cd2+) in the solution carries on the cultivation, after its, the stem, the leaf pretreats separately with80%ethanol, the deionized water, lmol/L the NaCl(sodium chloride solution),2%Acetic Acid,0.6mol/L the HC1(Hydrochloride). The digestion solution of the extraction and residues were used for measuring the enrichment amount of arsenic in the different parts of water hyacinth by ICP-MS and analyzing the molecular formulas by HPLC-MS.The experimental results and calculation showed that arsenic had different enrichment conformations in water hyacinth. The conformations of arsenic are130above, cadmium are30above,and lead is only1. By using Ultraviolet Spectrum Analysis, we concluded that enrichment conformations of heavy metal (arsenic, lead, cadmium)in water hyacinth were mainly exist in the forms of polysaccharide, benzoquinone, naphthoquinone, enol, phenyl and hydroxy. Chelates of heavy metals enriched in water hyacinth contains small molecular substances such as oxalic acid, histidine, malic acid, citric acid, Glutathione and macromolecule substances such as metallothionein, foliage Complex, metallic, albumen.The conclusion is:The experiment analyzes obtained the water hyacinth root, the stem, the leaf have truly enriched to As, Cd, Pb. The enrichments of arsenic and lead were root>leat>stem. The enrichment of cadmium was root> stem>leat.The quantity of three kind of heavy metals enrichments:As> Pb> Cd.2The quantity of enrichments did not descend with Sequential Extraction.It demonstrated that each extract of compatibility can only be extracted one kind of compounds and chelate of arsenic, lead, cadmium, and each shape of heavy metal enrichments exist diversity.It provided the basis for the next analysis of HPLC-MS and Ultraviolet Spectrum Analysis.â‘¢HPLC-MS and UV analysis obtained three kinds of water hyacinth accumulation of heavy metals accumulation patterns exist diversity;Enrichments are As>Cd>Pb.Finally, using the high accuracy ab initio methods, quantum chemical alculations as the analysis simulation calculation basis and choosing a HF method calculated the order of activity that was regulated by the electrophiles attack activity:Pb(OH)42->Pb(OH)3-> Pb(OH)2>PbOH+; the order of activity that was regulated by the nucleophile attacks: PbOH+>Pb(OH)2>Pb(OH)3->Pb(OH)42-.And along with hydrogen coordination number of the trivalent arsenic species,increased, it's On the contribution of the frontier molecular orbital (HOMO and LUMO) was significantly reduce,and then slightly elevated., along with hydrogen coordination number of the pentavalent arsenic species increased, it's on HOMO orbital contribution increases gradually and the LUMO orbital contributions decreases gradually.visiblely, as the hydrogen coordination number increased, the As accept electronic tendency decreased gradually, namely the acidity of the system increased, As be passived.The order of Cd(II) in Hydrate's activity:Cd(H2O)62+<Cd(H2O)52+<Cd(H2O)42+. With degree of hydrolysis deepen, the ability of Cd(II)accepted electronic increased significantly, namely in the center of cadmium atoms had been activated, the order of Cd(II)'s activity in Hydrolysis species:Cd(OH)42->Cd(OH)3(H2O)2->Cd(OH)3(H2O)3-> Cd(OH)2(H2O)4> Cd(OH)(H2O)5+.In order to confirm the result of experiment and analysis, Ab initio quantum chemistry methods of calculating are made use. Theoretically it confirmed water hyacinth has ability to enrich heavy metals, eliminate heavy metals pollution, and make water purification.