| This paper initially research surface soil of 8 uniforms of Xinxiang city, using F-AAS determine the volume of Pb, Cd, Cu, Zn in the soil, and using single-factor pollution index, Nemerow Comprehensive pollution index and the potential ecological risk index analyza the data ,then get the distribution of these several heavy metal elements, the results show that the order of the accumulation Strength of Xinxiang City were Cd> Zn> Cu> Pb,.Cd, Zn, Cu in the soil in each plot were greater than the average mass fraction of soil background values in Henan Province, Pb present in the enrichment of individual cell phenomenon, Cd, Zn accumulation in the district of greater intensity, Cd pollution in all 8 quarters have reached a very high level; the order of potential ecological risk index in Xinxiang City area is Cd> Cu> Pb = Zn, Cd single potential ecological risk index in all of the district is more than 80, the degree of pollution is High, the potential ecological risk index of soil area of Xinxiang City is more than 120, are at high risk levels Second, the pot experiment in the laboratory to simulate the Cd, Pb single pollution witch were two serious pollution factors in survey.put different concentrations of EDTA in different concentrations of Cd, Pb contaminated soil, put red dwarf series and blue February in these soil, the growth and absorption, transport, accumulation of Cd,Pb for red dwarf series, blue February were analyzed ,find the best low for red dwarf series and blue February to remediate contaminated soil. the following conclusions:(1)red dwarf series have some patience for soil Cd pollution. When the aid of Cd is relatively low, the growth of the red dwarf series was being promoted, as the aid of Cd increased, the promotion gradually becomes inhibitory. It have bad effect on red dwarf series'growth. When aid of Cd is too high,the plants will be significant damage, expressed as plant height low, leaf chlorosis loss and other symptoms. This experiment proved that, 40mg / kg is threshold of red dwarf series.(2)When not using EDTA red dwarf series'absorption of Cd: With the addition of Cd in soil increased, Cd content in root and shoot of red dwarf series increased, and the root content is more than shoot. But when the addition of Cd exceeds 20mg/kg, Cd content in soil growing, toxicity getting stronger, so that its transportion of Cd was inhibited, its transport coefficient reduce.(3)after adding EDTA, the heavy metals have been activated, improve its enrichment coefficient on the middle and low Cd contaminated soil of Cd, while its transport efficiency of Cd have been greatly improved, and promote its transport of Cd from root to the shoot. but the addition of high concentrations of Cd level (80mg/kg) on the use of higher concentrations of EDTA (6mmol/kg, 10mmol/kg), due to the concentration of EDTA and heavy metals are too high, the toxicity to plants is maximum, affecting the normal operation of plant functions, the transfer coefficient decreased. To sum up: 40mg/kgCd +10 mmol / kgEDTA is one of the best mode of the heavy metal phytoremediation for red dwarf series.(1)Blue February have some patience for soil Pb pollution. When the aid of Pb is relatively low, the growth of the Blue February was being promoted, as the aid of Pb increased, the promotion gradually becomes inhibitory. It have bad effect on Blue February's growth. When aid of Pb is too high,the plants will be significant damage, expressed as plant height low, leaf chlorosis loss and other symptoms. This experiment proved that, 500mg / kg is threshold of Blue February.(2) When not using EDTA Blue February's absorption of Pb: With the addition of Pb in soil increased, Pb content in root and shoot of Blue February increased, and the root content is more than shoot. Since the increase of Pb, toxicity increased, disrupting the normal growth mechanism of plants, it has been declining enrichment factor. Low levels of Pb (300mg/kg) can stimulate the transport of Pb in February on the blue, so transfer coefficient increased. But when the addition of Pb is too high, the coefficient on the transport of Pb into decline.(3)after added EDTA,the activation of the heavy metals, the amount of of Pb in shoots and roots increased,while the transport efficiency for Pb of blue February also increased, the addition of high concentration levels of Pb (500mg/kg, 1000mg/kg) on the use of higher concentrations of EDTA (6mmol/kg, 10mmol/kg), the blue February's transport coefficient increased relatively large.To Blue February 500mg/kgPb +10 mmol / kgEDTA is one of the best mode of the heavy metal phytoremediation. |
PDF Full Text Request