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Among a number of climate-related factors, moisture has the greatest impact on crop productivity. In recent years, certain changes have been observed under conditions of the Forest-Steppe of Ukraine with regard to precipitation – from low to in some cases – abnormally high, which requires the study of their impact on the yield and safety of cereal grain for its forecasted production. The article examined...
The municipal solid waste incinerator (MSWI) fly ash was classified by particle sizes: >;0.27 mm, 0.27-0.15 mm, 0.15-0.11 mm, 0.27 mm. However, there was significant quantity of Ni in fly ash with particle size between 0.11 mm and 0.15 mm.
The concentrations of As, Cd, Ni, Cr, Zn, Cu, Hg and Pb in the sediment of Xiyi River were analyzed by flame atomic absorption spectrophotometer (AAS). The results showed the average concentration of total As, Cd, Ni, Cr, Zn, Cu, Hg and Pb in the sediment was higher than the national threshold limit. The values of pollution index and integrated pollution index showed that the pollution level was Cd>;...
39 indigenous plant species in 18 families were collected and investigated in four heavy-metal polluted sites. The tolerance and hyptoextraction characteristics of them to Cd, Pb, Cu, Zn and As were examined. In field survey, Bidens bipinnata, Artemisia dubia, Polygonum lapatuifolium, Chenopodium ambrosioides and Solanum nigrum showed to concentrate remarkable heavy metal in shoots. In the further...
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 current study investigated oral bioaccessibility of soil Cu, Zn, Cd and Pb in an agricultural community known for contamination of Cd due to mining activities nearby, using an in vitro test that simulates human gastric condition. Relatively high metal concentrations compared to Thai `background' concentrations were observed and the %bioaccessibilites were found to be 28±13% for Cu, 42±18% for...
This study aimed to develop a methodology for analysis of heavy metals in municipal solid waste incineration (MSWI) slag. It performed analysis of composition of heavy metals, leaching toxicity, leaching behavior as a function of pH and specification distribution of Pb, Cd, Cu and Zn. It was found that content of heavy metals followed the decreasing sequence of Zn > Pb > Cu > Cd. MSWI slag...
Mn, Cu, Zn and Fe in rain samples collected in Jiaozuo city were measured by AFS, to evaluate the level of heavy metals in precipitation and the concentration variety of the month, then to presume the source of them, basing on the comparison of domestic and foreign cities and enrichment factor calculations. Individual rain events were sampled form April to September 2008. High heavy metals concentration...
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...
The concentration of eighteen nutrients and heavy metals in E. crassipes collected from different sites in the North Zhejiang, China was concurrently studied. The concentration of the elements in whole plants was in the order of K (14896.92 μg g-1)>P (5775.78 μg g-1)>S (5596.38 μg g-1)>Ca (2368.92μg g-1)>Pb (2380.03 μg g-1)>Mn (852.90 μg g-1)>Fe (782.63 μg g-1) >Al (456.26 μg...
130 wet deposition events were observed at the summit of Mt. Tai (East China, 1534 a.s.l) in China during Jan. 2005 to Dec. 2008. Zn, Al, Mn, Fe, Pb, Cu, Ni, Cr, As, and Cd were determined by ICP-MS to evaluate the characteristics of heavy metals in wet deposition at Mt. Tai region. The concentrations of these metals are generally higher at Mt. Tai than the concentrations observed at other monitoring...
Sludge can be used in agriculture as a fertilizer and soil conditioner. But heavy metals are one of the important factors affecting the sludge for agricultural purpose. In this study, the concentration of Zn, Cu, Pb, Cr, Mn and Ni in seven kinds of sludge from Guangzhou were analyzed and the chemical speciation of heavy metals in the five kinds of sludge were studied. The results showed that the concentration...
Soil pollution is a worldwide problem. Both inorganic and persistent organic pollutants (POPs) possess high toxicity and long-term persistence. Biosurfactant based remediation technologies for contaminated soil are of increasing importance recently, and they have been demonstrated to be effective in uptaking both heavy metals such as Cd, Pb, Zn, Cu, and organic pollutants like hydrophobic organic...
On basis of chemical extraction technology, H3PO4 has been used to remove heavy metals from the industrial sewage sludge. At the laboratory scale, heavy metals Zn, Pb, Cd, Ni, Cr and Cu were extracted synchronously from the sewage sludge. The results showed that H3PO4 concentrations had a significant effect on the extraction efficiency of heavy metals. The extraction efficiency increased gradually...
A series of urban wastewater in one WWTP of Xi'an, China was picked to investigate the mechanism of representative heavy metals removal by the wastewater treatment plant (WWTP). Under determine the six different heavy metals(Cu, Zn, Mn, Cr, Hg, As) and SS concentrations of the effluent of the fine screen, sand chamber, oxidation ditch and secondary sedimentation settler, it is wished to find the kinetics...
The research reveals the distribution and correlation of heavy metals in groundwater of sewage irrigation area in Guangdong province. 14 groundwater samples were collected in August 2008, and the groundwater samples were filtrated through 0.45 μm membranes and acidified in the field. Determinations of Cd, Cu, Zn, Pb, Ni, and Cr in all the samples were performed using ICP-OES, and determinations of...
Combustion tests of the synthetic samples of household waste were carried out to investigate emissions of heavy metals and chlorine derived from plastics waste into bottom ash and fly ash. PVC, PP, PS, and PET were focused as typical plastics wastes in this study. Concentration distributions and leachabilities of Cu, Pb, Zn, Mn and Cl in bottom ash and fly ash were confirmed by XRF analyses and leaching...
Concentrations of selected heavy metals (Cr, Cu, Zn, As, Cd, Hg and Pb) in surface sediments from 18 sites were examined in Zhangjiang Estuary Mangrove National Natural Reserve (ZEMNNR), which is the largest natural mangrove forest north of the Tropic of Cancer in China. The ranges of heavy metals expressed in mug/g sediment dry weight were as follows: Cr (48.14 to 110.01), Cu (18.15 to 43.18), Zn...
Based on leaching experiment, the leaching of heavy metal in mine waste was brought out. The research showed that Zn, Cr, Pb and Cu concentrations are most in the leachate of weathered coal waste, and the concentration became stable rapidly; only Zn concentrations are found in fresh mine waste leachate in the beginning time. The soil around mine waste also was contaminated by heavy metal, such as...
The civil sludge taken from Qilidian sewage treatment plant of Guilin was used as the cultivation medium and ferrous sulfate (FeSO4.7H2O) was substrate for the growth of bioleaching microorganisms in this research. Through strength environment of bacterial, the indigenous Thiobacillusferrooxidans(T.f)in fresh sludge was propagated greatly and become the dominant species in this process. Overall the...
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