scholarly journals Accumulation and distribution of heavy metals in surface sediments of a semienclosed basin in the southeastern Mediterranean Sea, Egypt

2007 ◽  
Vol 8 (1) ◽  
pp. 31 ◽  
Author(s):  
M.A.M. ABDALLAH
Keyword(s):  
Heavy Metals ◽  
Mediterranean Sea ◽  
Surface Sediments ◽  
Geoaccumulation Index ◽  
Enrichment Factors ◽  
Mediterranean Coast ◽  
Surficial Sediments ◽  
Entire Area ◽  
Metal Contents ◽  
Alexandria City

The distribution, enrichment and accumulation of heavy metals in the surficial sediments of the Alexandria City Eastern Harbour (Mediterranean coast of Egypt) were investigated. Surface sediments (in the <63mm fraction) collected from 12 sites representing the entire area of the harbour, were analyzed by AAS for Cd, Cu, Zn, Cr, Pb and Al. Metal contents were compared with literature data to assess the pollution status of sediments. Enrichment factors (EFs) and the geoaccumulation Index (Igeo) were calculated as a criterion of possible contamination.

Distribution and Pollution Assessment of Heavy Metals and Petroleum Hydrocarbon in Surface Sediments from Chenglingji Port

2014 ◽  
Vol 675-677 ◽  
pp. 510-515
Author(s):  
Hong Xia Xiong ◽  
Xin Lei Liu ◽  
Chang Bing Liu ◽  
Xin Bin Liu
Keyword(s):  
Heavy Metals ◽  
Petroleum Hydrocarbon ◽  
Surface Sediments ◽  
Geoaccumulation Index ◽  
Pollution Assessment ◽  
Dongting Lake ◽  
Risk Level ◽  
Hydrocarbon Content ◽  
Standard Value ◽  
Factor Index

Concentration of 4 heavy metals (Cu, Pb, Zn, Cd) and petroleum hydrocarbon in the surface sediments collected from Chenglingji, Dongting Lake, were quantitatively analyzed. Distribution characteristics and possible sources of the heavy metals and petroleum hydrocarbon were discussed. Methods of single-factor index and geoaccumulation index were adopted to evaluate the potential ecological risks of heavy metal. The results showed that Cd was seriously polluted and in a strong ecological risk level; Cu, Pb and Zn pollution was mild in Chenglingji Port, Dongting Lake. Petroleum hydrocarbon content of nearshore sediment was low exclude of area near Chenglingji Port, which significantly exceeded the standard value. And the content of petroleum hydrocarbon decreased with the distance far away from the harbor.

scholarly journals Heavy Metals Pollution and Pb Isotopic Signatures in Surface Sediments Collected from Bohai Bay, North China

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Bo Gao ◽  
Jin Lu ◽  
Hong Hao ◽  
Shuhua Yin ◽  
Xiao Yu ◽  
...  
Keyword(s):  
Heavy Metals ◽  
North China ◽  
Surface Sediments ◽  
Geoaccumulation Index ◽  
Pollution Level ◽  
Bohai Bay ◽  
Isotopic Signatures ◽  
Metals Pollution ◽  
Heavy Metals Pollution ◽  
The Mean

To investigate the characteristics and potential sources of heavy metals pollution, surface sediments collected from Bohai Bay, North China, were analyzed for the selected metals (Cd, Cr, Cu, Ni, Pb, and Zn). The Geoaccumulation Index was used to assess the level of heavy metal pollution. Pb isotopic compositions in sediments were also measured to effectively identify the potential Pb sources. The results showed that the average concentrations of Cd, Cr, Cu, Ni, Pb, and Zn were 0.15, 79.73, 28.70, 36.56, 25.63, and 72.83 mg/kg, respectively. The mean concentrations of the studied metals were slightly higher than the background values. However, the heavy metals concentrations in surface sediments in Bohai Bay were below the other important bays or estuaries in China. The assessment by Geoaccumulation Index indicated that Cr, Zn, and Cd were classified as “the unpolluted” level, while Ni, Cu, and Pb were ranked as “unpolluted to moderately polluted” level. The order of pollution level of heavy metals was:Pb>Ni>Cu>Cr>Zn>Cd. The Pb isotopic ratios in surface sediments varied from 1.159 to 1.185 for206Pb/207Pb and from 2.456 to 2.482 for208Pb/207Pb. Compared with Pb isotopic radios in other sources, Pb contaminations in the surface sediments of Bohai Bay may be controlled by the mix process of coal combustion, aerosol particles deposition, and natural sources.

scholarly journals Bioavailability and Assessment of Metal Contamination in Surface Sediments of Rades-Hamam Lif Coast, around Meliane River (Gulf of Tunis, Tunisia, Mediterranean Sea)

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Rim Ben Amor ◽  
Asma Yahyaoui ◽  
Myriam Abidi ◽  
Lasaad Chouba ◽  
Moncef Gueddari
Keyword(s):  
Heavy Metals ◽  
Mediterranean Sea ◽  
Surface Sediments ◽  
Total Concentration ◽  
Anthropogenic Sources ◽  
Residual Fraction ◽  
Gulf Of Tunis ◽  
Exchangeable Fraction ◽  
Geochemical Indices ◽  
Low Toxicity

The total concentration and the speciation of heavy metals (Pb, Cd, Cu, Zn, Ni, and Cr) in surface sediments of Rades-Hamam Lif coast were determined, with particular focus on the effect that urban and industrial waste in the Meliane river has on the estuary and coastal surface sediments of the Rades-Hamam Lif coast, off the Mediterranean Sea. Several geochemical indices were applied to assess the risk of contamination and the environmental risks of heavy metals on surface sediments. The total concentrations of these heavy metals are influenced by runoff, industrial, and urban wastewater. The Cd, Pb, Zn, and Ni are affected by anthropogenic sources, especially at the mouth of the Meliane river. The sequential extraction of Cd was presented dominantly in the exchangeable fraction and thus the high potential bioavailability. In contrast, Cr and Cu were mostly bound to the residual fraction indicating their low toxicity and bioavailability. The order of migration and transformation sequence was Cd > Pb > Ni > Zn > Cr > Cu, and the degree of pollution was Cd > Pb > Ni > Zn > Cr > Cu.

Soil Pollution of Cu, Cr, Pb and Cd in Traffic Trunk Roadsides in Xi’an

2014 ◽  
Vol 1073-1076 ◽  
pp. 672-677 ◽  
Author(s):  
Rui Yu Jia ◽  
Nan Li ◽  
Jie Tong ◽  
Wan Yong Zhu
Keyword(s):  
Heavy Metal ◽  
Surface Soil ◽  
Geoaccumulation Index ◽  
Composite Index ◽  
Sampling Technique ◽  
Enrichment Factors ◽  
Mixed Solution ◽  
Sampling Area ◽  
Traffic Condition ◽  
Metal Contents

Two roads (‘Nan Er huan’ abbreviated as R1,and ‘Huan Cheng Nan Lu’ abbreviated as R2) as the sampling area were selected based on Xi 'An traffic condition in China. Soil samples were randomly collected by triple sub sampling technique in each area and digested by mixed solution of FAAS and GFAAS according to the standard methods. The results show that total heavy metal contents of Cu, Cr, Pb and Cd in soil are 30.01±6.27 mg•kg-1、51.55±24.82 mg•kg-1、176.13±23.19 mg•kg-1and 2.73±1.93 mg•kg-1, and are 1.15, 0.73, 4.54, and 9.75 times of corresponding heavy metal soil background values in Xi 'an, China. The Nemerow composite index is 12.74, Geoaccumulation index of Cd, Pb, Cu and Cr are 2.7, 0.73, 0.38 and 1.04, Enrichment factors were:10 > Cd > Pb > Cu > Cr > 1. Surface soil is characterized by accumulation of the strength of the Pb, Cd, and Cu, Cr pollution is to a lesser degree.

Assessment of heavy metals in tobacco of cigarettes commonly sold in Ethiopia

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Heavy Metals ◽  
Trace Metals ◽  
Atomic Absorption Spectrophotometry ◽  
Epidemiological Studies ◽  
Cigarette Tobacco ◽  
Absorption Spectrophotometry ◽  
Wet Digestion ◽  
Metal Contents ◽  
Cu And Zn ◽  
Significant Flux

A significant flux of heavy metals, among other toxins, reaches the lungs through smoking. This study reports Cd, Pb, Cu and Zn contents in tobacco of 11 brands of cigarette commonly sold in Ethiopia. The heavy metals were determined by atomic absorption spectrophotometry after wet digestion of cigarette tobacco using HNO3 and H2O2. The concentration of trace metals in the cigarettes ranged (mean) (μg/g), Cd: 1.3−7.6 (2.48±0.32), Pb: 0.50−12.50 (6.24±2.2), Cu: 2.89−25.35 (13.70±4.12) and Zn: 24.40−62.55 (36.22±7.50) while Ni was not detected in all the eleven brands of cigarettes. Comparable levels of trace metals were obtained in the tobacco of both imported and Ethiopian cigarettes. The average trace metal contents of cigarettes available in Ethiopia were Cd 1.82±0.39, Pb 4.23±0.97, Cu 10.2±3.1 and Zn 28.2±7.8 μg/cigarette and a person who smokes 20 cigarettes per day is estimated to increase his/her daily Cd, Pb, Cu and Zn retention by approximately 0.036, 0.085, 0.204, 0.564 mg/day, respectively. The results indicate that smoking and exposure to cigarette smoke is a serious problem to be taken into account when carrying out epidemiological studies on human exposure to trace metals.

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