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排序方式: 共有192条查询结果,搜索用时 15 毫秒
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SORPTION AND DESORPTION CHARACTERISTICS OF CADMIUM BY FOUR DIFFERENT SOILS IN NORTHEAST CHINA 总被引:3,自引:0,他引:3
ZHANG Lei SONG Feng-bin 《中国地理科学(英文版)》2005,15(4):343-347
1IN TR O D U C TIO NA s a persistentand toxic pollutant, cadm ium (C d) canresultin m any adverse health effects in a variety oftis-suesand organssuch asthe lung,kidney,urinary,blad-der,pancreas,breast and prostate (SA TA R U G etal.,2003).C adm ium in so… 相似文献
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A novel strategy using biodegradable EDDS for the chemically enhanced phytoextraction of soils contaminated with heavy metals 总被引:1,自引:0,他引:1
Chunling LUO Zhenguo SHEN Alan J.M. Baker Xiangdong LI 《中国地球化学学报》2006,25(B08):115-115
For the sake of cost and potential environmental risk, it is necessary to minimize the amount of chelates used in chemically-enhanced phytoextraction. In the present study, a biodegradable chelating agent, EDDS was added in a hot solution at 90℃ to the soil in which garland chrysanthemum (Chrysanthemum coronarium L.) and beans (Phaseolus vulgaris L., white bean) were growing. The application of hot chelate solutions was much more efficient than the application of normal chelate solutions (25℃) in improving the uptake of heavy metals by plants. When 1 mmol kg1 of EDDS as a hot solution was applied to soil, the concentrations ofCu, Zn and Cd and the total phytoextraction by the shoots of the two plant species exceeded or approximated those in the shoots of plants treated with 5 mmol kg^-1 of normal EDTA solution. The concentrations of metals in the shoots of beans were significantly correlated with the relative electrolyte leakage rate of root cells, indicating that the root damage resulting from the hot solution might play an important role in the process of chelate-enhanced metal uptake. The soil leaching study demonstrated that decreasing the dosage of chelate resulted in decreased concentrations of soluble metals in soils. On the 28th day following the application of chelate, the concentrations of soluble metals in the EDDS treated soil were not significantly different from the concentrations in the control soil to which chelates had not been applied. 相似文献
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Xinbin FENG Shaofeng WANG Guangle QIU Yamin HOU Shunlin TANG 《中国地球化学学报》2006,25(B08):243-244
Guizhou is located in the Circum-Pacific Global Mercuriferous Belt, and mercury concentrations in soil in this area are enriched. In-situ total gaseous mercury (TGM) exchange fluxes between air and soil surface were intensively measured at four sampling sites in Guiyang from 21 May to 16 June, 2003, and five sites in the Lanmuchang mercury mining area in December 2002 and May 2003, respectively. The in-situ Hg flux measurement was conducted with a dynamic flux chamber (DFC) of quartz. Overall, net emissions were obtained from all sampling sites. Soil mercury concentration and solar radiation have been proved to be the two most important parameters to control mercury emissions from soil. Meanwhile, rain events can enhance mercury emission rate significantly. 相似文献
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YU Jie Ursula Pietrzak Jim Peterson 《地球空间信息科学学报》2005,8(4):257-261
In that orcharding in early-to-mid twentieth century southeastern Australia involved use of certain heavy metal and As compounds in regular pest-control spray procedures, some interest attaches to the possibility that these landparcels are underlain by soils with above-background Cu, Pb and As levels. Interpreta- tion of Land-cover changes allowed land parcels previously occupied by orchards to be identified in the 1950s through time-series air-photos. A comparison of soil analysis results referring to soil samples from control sites, and from land parcels formerly occupied by orchardists, shows that contamination (above-background) levels of cations in the pesticides can be found in the top 6 cm of former orchard soils. It is clear that digital spatial data handling and culturally-informed air photo interpretation has a place in soil contamination studies, land-use planning (with particular reference to re-development) and in administration of public health. 相似文献
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铬酸根离子在羟基铁离子一蒙脱石体系中的吸附行为研究 总被引:2,自引:0,他引:2
采矿,电镀,制革等行业废物排放及含Cr矿物风化可造成一些地区土壤和地下水的Cr污染,Cr主要以三价和六价形式存在,其中Cr(Ⅵ)有强的迁移能力,对动植物均有很强的毒害性。研究了在氧化,酸性条件下,土壤及土壤溶液中的蒙脱石和羟基铁离子共存时对铬酸根离子(主要以HCrO4^2-)和CrO4^2-等Cr(Ⅵ)形式存在)的吸附行为,进行了蒙脱石,羟基铁离子,Cr(Ⅵ)离子添加顺序不同的3个系列的实验,重点研究了Cr的初始质量浓度,溶液pH值,环境温度,吸附时间,溶液离子强度对3个系列Cr吸附行为的影响,并与羟基铁离子体系进行了对比。结果表明,蒙脱石-羟基铁离子体系的Cr吸附能力明显强于蒙脱石而低于羟基铁离子,其Cr吸附率随Cr初始质量浓度,温度的升高和吸附时间的延长而降低,随离子强度的升高而升高,而pH值对不同系列的Cr吸附率有不尽相同的影响。 相似文献
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我国部分市郊农田的重金属污染与防治途径 总被引:12,自引:2,他引:12
分析了我国部分主要城市农田土壤及农作物重金属污染状况,以了解土壤中与农作物中重金属污染物间的相互关系、变化趋势及造成污染的影响因素。结果表明,我国各大城市的农田土壤及农作物都存在不同程度的重金属污染,北方地区的土壤及农作物受重金属污染程度普遍高于南方。重金属在农作物与土壤中的含量一般呈正相关关系,受多种因素影响。对于已污染的土壤,可采用农业工程措施、生物修复法和施用改良剂等予以治理。 相似文献
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被污染土壤的植物修复研究 总被引:11,自引:1,他引:11
植物修复是利用植物吸收、降解、挥发、根滤、稳定、泵吸等作用机理,达到去除土壤、水体中污染物,或使污染物固定以减轻其危害性,或使污染物转化为毒性较低化学形态的现场治理技术.植物修复对于重金属污染土壤的治理修复具有重要意义.已有研究在累积与超累积植物的寻找筛选、植物对重金属等有害物的耐毒和解毒机理、植物修复现场环境调控及根际处理技术等方面取得了大量成果.现代分子生物学、基因工程技术发展有可能使植物修复技术取得重大突破. 相似文献