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The electrokinetic remediation method of soil contaminated by heavy metal was researched cadmium by means of experiments in this paper, and the characteristic and mechanism for distribution and migration of heavy metal under an electric field were analyzed too. The experimental results indicated that the concentrations of heavy metal varied obviously in soil in electric field and the heavy metal pollutants...
The purpose of this study is to evaluate the adsorption potentialities of humate substances in natural environments. Humic acid and insolubilized humic acid are selected as prototypes. This paper presents the development of a new remediation technology for contaminated sandy soil using humic acid (HA). The results indicated a significant increase of the adsorption of Cr (VI) because the complexion...
In order to identify the content of various heavy metals, soils of the farmland surrounding the Huashan's gold tailing mine are studied. Surrounding soil samples are collected in new and old tailing mines. Flame atomic absorption spectrometry is taken to measure the content of Pb, Zn, Cd, Cr, and Cu. In addition, the method of combining the Geo-accumulation index and the potential ecological risk...
The electrokinetic remediation technique of soil contaminated by heavy metal lead was researched by means of experiments in this paper, and the characteristic and mechanism for distribution and migration of lead were analyzed too. The experimental results indicated that the concentrations of heavy metal changed obviously in soil in electric field and most of the heavy metal pollutants could be enriched...
To study the spatial distribution characteristics of 10 heavy metals(As, Hg, Mo, Cd, Cr, Zn, Cu, Mn, Pb, Ti) in the soil of Dexing area, Semi-variance function is used to quantitatively describe the structural features of the spatial distribution and map the content distribution. The analysis shows, in addition to cadmium and lead, other elements fit relatively well, which reflects a good spatial...
The research reveals the mobility and distribution of heavy metals (Cd, Cu, Zn, Mn, Ni, and Cr) in soil of sewage irrigation area in Pearl River Delta. Samples were collected from topsoil (0-10cm) and subsoil (30-40cm), and the total concentration and available concentration of heavy metals were extracted by HNO3-HF-HClO4 and DTPA respectively. The mean total concentrations for all of the heavy metals...
The efficiency of electrokinetic remediation of zinc contaminated soils and the influence of complex EDTA were researched by means of experiment for the complicated remediation of soil contaminated by typical heavy metal in this paper, and migration and variation characteristics of zinc were analyzed too. The experimental results indicated that the heavy metal pollutant could be enriched and removed...
The geo-statistical method was used for predicting the distribution of the content of Chrome (Cr) and tracing the hotspots in water-level-fluctuating zone. The hotspots of Cr pollution which indicated higher risk than other areas were identified to be mainly distributed in the water-level-fluctuating zone of soils near populated areas along the Xiao River. The mean contents of Cr in soils are more...
The spatial distribution and variation of six heavy metals and metalloid in soil of Zhuji Lipu copper mining area was studied using geostatistics approaches combined with GIS. These elements included Pb, As, Cr, Cu, Zn and Ni. The statistical analyses showed that concentrations of these elements were lognormal distribution. Concentrations of Pb, As, Cu, Zn and Ni were strongly correlated with each...
This study is supported by the agriculture geochemical survey project in Dakang town, Jiangyou city. This paper studies the characteristics of heavy metal pollution in soil and then evaluates heavy metal potentialities in purple soil and paddy soil by adopting the potential ecological risk index(PERI) proposed by Hakanson. In purple soil, the data show that Hg, Cd, and Cu are the top three heavy metals...
Environmental quality of reclaimed soil is a key issue in the process of land construction and ecology rehabilitation. Taking Xinzhuangzi and Datong reclamation district for example, according to Nemerow Pollution Index Method, results show that: In all 30 soil samples, 28 samples are I class level, clean; 1 sample is II class level, slightly clean; 1 sample is III class level, polluted slightly....
The research reveals the relationship and enrichment of heavy metals in soil of sewage irrigation area in Guangdong province, southern China. Samples were collected from topsoil (0-10cm) and subsoil (30-40cm), and the total concentrations of heavy metals were extracted by HNO3-HF-HClO4. It is concluded that Cu, Zn, Cd, and Pb may be homologous or combined pollution, and Mn and Cr may be also homologous...
An exploratory study on sediment and soil contamination of heavy metals was carried out along Dalian coastal regions in Liaoning province, China. Estuarine intertidal sediment samples and their adjacent upland and paddy soil samples were analyzed by atomic absorption spectrophotometry for Zn, Cu, Pb and Cr. The contamination of the sediments and soils was assessed on the basis of enrichment factor...
Increasing evidence suggests that nanoscale zero valent iron (nZVI) is one of best materials for the treatment of heavy metal ions in water. In this work, the reduction of Cr(VI) by nZVI was investigated. Laboratory experiments with varied Cr(VI) concentrations and nZVI doses were performed. Chromium removal efficiency decreases as the ratio [Cr(VI)]/nZVI increases due to the limited reaction sites...
Atmospheric deposition samples were collected and analyzed from 50 sampling sites in Baoshan district, Shanghai. The results show that the average concentration of Pb, Cr, Cd, Zn and Cu is 281.88, 254.45, 7.06, 2433.92 and 3321·08mg-kg-1 respectively, which are much higher than background values of soil in Shanghai. The spatial distribution features of live heavy metals illustrate higher concentrations...
By using a hydrothermal treatment process, coal fly ash was transferred to a series of synthesized zeolites and characterized XRD and SEM observations. The synthesized zeolites exhibited more enhanced adsorption capacities for metals compared to the raw material as the increased CEC of the synthesized zeolites apparently provides a better adsorptive ability for metals. For the three synthesized zeolite...
Soil samples (0-10cm soil layer) were collected from Xuanwei and Fuyuan, which were known as high lung cancer incidence area in Yunnan province, China.The aim of the study was to investigate the trace metal pollution situation of the local village. Total 24 samples of surface soil were analyzed for 32 trace metals. The samples were digested with HNO3 and HF and H2O2 using microwave. The concentrations...
Soils and dominant plants were surveyed in the Siding mineland area. Based on the determination of heavy metal concentration of soil from 8 sections and 14 dominant plant species in different parts, the potential ecological risk was assessed using the Hakanson Index Method. The results indicated that the soil of Siding mineland area was seriously contaminated by Pb and Zn. The risk index values of...
The study analyzed metals (Zn, Cu,Cr,As) content in vegetables of vegetable bases of Lanzhou City. Metals content in Solanum tuberosum, Solanum lycopersicum, Solanum melongena, Capsicum annuum, Vigna sinensis, Brassica oleracea, and Allium fistulosum of vegetable bases of Lanzhou City showed significant difference. Overall, the highest content of Zn was found in Allium fistulosum, and the lowest was...
Solidification/stabilization effect of FeSO4 and Ca(OH)2/CaO on chromium contaminated soil were studied by contrast, especially the effect of its reaction interval time and concentration. The change of S/S effect with time was also discussed. Results reveal that the reaction interval time effected on S/S slightly, with the high quality ratio of water to soil. As FeSO4 and Ca(OH)2 was used as the S/S...
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