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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>;...
The contents and characteristics of ten heavy metals in surface sediments from Yangzonghai Lake in Yunnan, China were analyzed. Ecological risk index presented by Håkanson to assess the potential ecological risk of Yangzonghai Lake was utilized. The results showed that the average concentrations of titanium(Ti), manganese(Mn), zinc(Zn), vanadium(V), chromium(Cr), copper(Cu), nickel(Ni), cobalt(Co),...
A set of sixty six surface sediment samples were collected from the beach area and its adjacent region in Central part of Tamil Nadu State, SE Coast of India. The samples were analyzed for organic carbon, carbonates, texture of sediments and Partially Extracted Trace Metals (PETMs) (As, Ba, Be, Cd, Co, Cr, Cu, Fe, Mn, Pb, Sr, V, Zn). The results indicate that the organic carbon and carbonates in the...
Ten sites along the XiJiang River (WuZhou section), China were sampled to evaluate the copper (Cu), Zinc (Zn), lead (Pb), cadmium (Cd), and chromium (Cr) concentrations in sediments. The order of total metal concentrations in sediment samples was found to be Zn>Cu>Cr>Pb>Cd. The approach of Hakanson potential ecological risk index was used for the ecological risk assessment. Compared to...
With the modified BCR sequential extraction method, the ultrasonic vibration and microwave digestion techniques were applied to extract heavy metal forms in sewer sediments. Considering the influence of extraction time, temperature, extractant concentration and the digestion types on the extraction efficiency, the optimal testing conditions of sediments pre-treatment were defined. Compared with the...
With the Tessier Five-step Continuous Extracting Method, the thesis studied the form distribution of heavy metals in the sediment samples collected from Mochou Lake, Xuanwu Lake and Qinhuai River in Nanjing, analyzed the correlation between leaching contents of heavy metals and various forms and between content of organic matter and leachability of heavy metals and between organic matter and organic...
The potential hazard of contamination directly depends on the presence and concentrations of mobile and biologically available element species. The mobility and availability of elements are known to depend on the chemical species of elements and the type of their bonding with the soil matrix. A three-step sequential extraction procedure (BCR-SEP) was used to determine the concentration of heavy metal...
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...
In this study, heavy metal contents (Cu, Cr, Pb, Mn, Cd) were measured in sediments and plants from Yellow River wetland Nature Reserve of Zhengzhou, China. 6 species of family Compositae, 5 species of family Gramineae and samples of sediments were taken from 4 different sites and analyzed by flame atomic absorption spectrophotometer for elemental contents. In general, sediments in the study area...
Determination of optimal sampling transects and pollutants for river sediments are essential and valuable. To determine if the concentration of some metals were highly correlated, correlations between heavy metals (As, Pb, Cd, Cr, Hg, Cu, Ni and Zn) were analyzed using statistic analysis software (SAS) based on monitoring data of heavy metals along the whole watercourse sediments of Dagu River. To...
Twelve samples of surface sediment in Nanhu Lake, Wuhan city were collected and the concentrations of Organic Matter (OM), Total Nitrogen (TN), Total Phosphorus (TP), ammonia nitrogen (NH4+-N) and nitrate nitrogen (NO3--N) were determined; the average result were 6.58%, 3972, 1712, 897 and 20mg/kg separately. Cd, Hg, As, Cu, Pb, Cr and Zn were determined too; and the average value were 0.46, 0.140,...
Taking an urban sewage river in north China as study object, total concentrations and concentrations of different chemical forms of heavy metals in surface sediment samples are determined. The relative enrichment factors and the potential ecological risk index, Hakanson index, are taken to study the pollution status of heavy metals in sediments and assess the potential ecological risk. The results...
South Taihu Lake used to get less attention in terms of environmental pollution study in the past. Sediment and fish samples were collected from South Taihu Lake in 2009. Heavy metals were measured for both types of samples and potential health risks were evaluated. Concentration of Cu, Zn, Cr and Ni were determined for sediments samples, and Cu, Zn, Ni, Fe and Mn were determined for fish samples...
The removal of heavy metal ions(HMI) contained in the electroplating wastewater by precipitation flotation was studied. Experimental results show that chromium, copper, nickel and other heavy metals can be removed efficiently, and all the water quality indexes were up to the first grade of wastewater discharge standard (GB21900-2008) when the dosage of Na2S (CNa2S:CMe=1.6) and pH7.5-8.5. The percentage...
The South Taihu Lake receive localized metal pollution from the factories nearby. The aim of this study was to find out the heavy metal accumulation in South Taihu Lake. Concentration of some heavy metals (Cu, Zn, Cr, Ni, Pb, Cd) were determined in sediments samples. Heavy metal levels were analyzed by ICP. Concentrations varied significantly from different sampling sites. The results showed that...
Taking the main pollution source of sewage river in north China as study object, concentrations of ammonia, chemical oxygen demand and heavy metals in sources of pollution and nearby water are determined. The two dimension steady river water quality models of ammonia and chemical oxygen demand are established, and the geometric characteristics of pollutant zone at downstream of the pollution source...
Taking the Beitang and Dagu Sewage Discharge Channels in Tianjin, China, as study objects, concentrations of heavy metals and organic matter are determined in upper layer, middle layer and lower layer sediment samples. Geo-accumulation index method and correlation analysis are taken to study the distribution and pollution level of metals between layers in the two channels contrastively. The results...
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...
The remains of zooplankton subfossil and sediment characteristics were examined from a macrophyte dominated shallow lake Wuliangsuhai in Inner Mongolia, China, in order to study past limnological changes. The lake began to switch to eutrophication gradually in the middle 1980s, creating a Transitional Sediment Layer (TSL, about 17 cm depth) that can be visually used to separate sediments derived from...
Heavy metal concentrations in estuarine intertidal sediments and adjacent agricultural soils of Dalian, northeastern China were monitored to indicate the status of heavy metal contamination and assess environmental quality of sediments and agricultural soils, which were analyzed by atomic absorption spectrophotometry for Zn, Cu, Pb and Cr. The sediment and soil environmental quality on the base of...
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