scholarly journals Heavy metals in salt marsh sediments of Porteresia bed along the Karnafully river coast, Chittagong

2012 ◽  
Vol 7 (No. 3) ◽  
pp. 117-123 ◽  
Author(s):  
M.A.M. Siddique ◽  
M. Aktar
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Salt Marsh ◽  
Atomic Absorption Spectrophotometry ◽  
Mean Values ◽  
Sediment Samples ◽  
Marsh Sediments ◽  
Salt Marsh Sediments ◽  
Contamination Levels ◽  
Positive Correlations

Heavy metal (Cu, Zn, Cd, Pb and Fe) concentrations in salt marsh sediments of the Karnafully River coast were investigated in this study. Sediment samples of four different sites were analysed for selected heavy metals by AAS (atomic absorption spectrophotometry). The mean values of heavy metals were 45.79 µg/g for Cu, 105.0 µg/g for Zn, 0.43 µg/g for Cd, 26.70 µg/g for Pb and 3297.38 µg/g for Fe in this study. It is observed that Pb and Cu have positive correlations (r = 0.370, P < 0.05) and Fe and Zn have negative correlations (r = –0.729, P < 0.05) in the correlation matrix. Except Fe, all the metals were found at contamination levels which may indicate a recent and continuous contamination from domestic and industrial discharges. The results of sediment samples showed that the Karnafully River coast is facing heavy metal pollution.

scholarly journals Analysis of Nitrogen-Fixing Members of the ε Subclass of Proteobacteria in Salt Marsh Sediments

2007 ◽  
Vol 73 (23) ◽  
pp. 7747-7752 ◽  
Author(s):  
Allana Welsh ◽  
David J. Burke ◽  
Dittmar Hahn
Keyword(s):  
Salt Marsh ◽  
Gel Electrophoresis ◽  
Gene Clone ◽  
Nitrogen Fixing ◽  
Marsh Plant ◽  
Sediment Samples ◽  
Salt Marsh Plant ◽  
Marsh Sediments ◽  
Salt Marsh Sediments ◽  
Sequence Similarities

ABSTRACT Based on phylogenetic analysis of clones retrieved from two nifH gene clone libraries that were created using cDNA from suboxic sediment samples obtained from areas densely vegetated with the high-salt marsh plant Spartina patens, a primer set was designed to target nitrogen-fixing bacteria with sequence similarities to members of the ε subclass of Proteobacteria. Nested PCR, denaturing gel electrophoresis, and subsequent sequence analysis of reamplified fragments confirmed the specificity of the primer set by retrieving nifH sequences of only putative members of the ε subclass of Proteobacteria, all of which were characterized by a highly divergent 27- or 36-bp insertion in both DNA and cDNA.

Fate and effects of heavy metals in salt marsh sediments

2007 ◽  
Vol 149 (1) ◽  
pp. 79-91 ◽  
Author(s):  
Kallaya Suntornvongsagul ◽  
David J. Burke ◽  
Erik P. Hamerlynck ◽  
Dittmar Hahn
Keyword(s):  
Heavy Metals ◽  
Salt Marsh ◽  
Marsh Sediments ◽  
Salt Marsh Sediments

Heavy metals inHediste diversicolor(polychaeta: nereididae) and salt marsh sediments from the lagoon of Venice (Italy)

2005 ◽  
Vol 21 (6) ◽  
pp. 441-454 ◽  
Author(s):  
G. Frangipane ◽  
A. Volpi Ghirardini ◽  
F. Collavini ◽  
L. Zaggia ◽  
A. Pesce ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Salt Marsh ◽  
Lagoon Of Venice ◽  
Marsh Sediments ◽  
Salt Marsh Sediments

scholarly journals Study on the physicochemical properties and heavy metal status of sediment samples from Ohii Miri river in Abia State, Nigeria

2014 ◽  
Vol 3 (1) ◽  
Author(s):  
A E Jonah
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Physicochemical Properties ◽  
Rainy Season ◽  
Contamination Factor ◽  
Dry Season ◽  
Accumulation Factor ◽  
Sediment Samples ◽  
Positive Correlations ◽  
Geo Accumulation

The physicochemical properties and heavy metal status of sediment samples from Ohii Miri River in Abia State, Nigeria were studied. The section of the river studied (from Ahia-Eke to Amaoba-Ime) was divided into three segments designated as Stations A, B, and C. Five sediment samples were collected at each location. Values obtained from the five sampling points were averaged. The sediment samples were analyzed for pH, electrical conductivity, % organic carbon, % organic matter, % ammonium nitrogen, % nitrate nitrogen, % nitrogen, % sand, % silt, % clay, and heavy metals (Fe, Pb, Zn, Mn, Ni, Cd, and Cr) in the rainy and dry seasons respectively using standard procedures. Correlation analysis was also employed to examine the relationship between the various parameters in the sediment samples. The results obtained for heavy metals were compared with USEPA standard. The results showed that the sediment was acidic and the heavy metals concentrations exceeded the USEPA standard. Positive correlations were found to exist between Pb with Zn, Ni; Fe with Ni as well as Ni with Cd in the rainy season. In the dry season, Ni correlated positively with Pb, Zn; Cd with Pb, Ni. Positive correlations existed between Cr in dry season with Cr in rainy season and Pb in dry season with Cr in rainy season. PER indices (contamination factor, degree of contamination, ecological risk factor, sum of the individual potential risk, and geo-accumulation factor) have been calculated. Values of geo-accumulation factor showed that the sediment is not polluted with the studied heavy metals.

HEAVY METALS IN WATER, SEDIMENTS AND MARINE FISHES FROM BULGARIAN BLACK SEA

2017 ◽  
Author(s):  
Katya Peycheva ◽  
Katya Peycheva ◽  
Mona Stancheva ◽  
Mona Stancheva ◽  
Stanislava Georgieva ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Black Sea ◽  
Fish Species ◽  
Distribution Patterns ◽  
Marine Fishes ◽  
Marine Water ◽  
Mean Values ◽  
Sprattus Sprattus ◽  
Cu And Zn

In this study, the ecosystem marine water-sediment-biota was investigated and the pollution was assessed. The concentrations of eight elements were determined in marine water, sediments and four fish species collected from Black Sea (Varna), Bulgaria during 2013. Marine water recorded the highest concentrations of Zn (15-22 μg/L), As (1.1–1.2 μg/L) and Pb (0.7-0.8 μg/L) while Zn (31-52 μg/g), Pb (21-29 μg/g) and Cu (20-34 μg/g) and show the highest concentrations in sediments. Water and sediments showed similar spatial distribution patterns for the highest mean values of the different metals. In the analysed fish species, the highest concentration of the metals Cu and Zn were found in Trachurus Mediterrneus (0.42 mg/kg w.w) and in Sprattus Sprattus (12.7 mg/kg w.w), respectively while the heavy metals As and Hg were found with maximum values in Pseta Maxima (3.99 mg/kg w.w and 0.08 mg/kg w.w respectively). The results from this study were compared with our data for a previous period (2004-2006) and they show decrease in the levels of heavy metal.

PROBLEM OF HEAVY METAL SURFACE SEDIMENT CONTAMINATION IN THE EASTERN GULF OF FINLAND

2017 ◽  
Author(s):  
N Derugina ◽  
N Derugina ◽  
А Grigoriev ◽  
A Grigoriev ◽  
Дарья Рябчук ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Bottom Sediments ◽  
Late Holocene ◽  
Sediment Contamination ◽  
Gulf Of Finland ◽  
Slow Decline ◽  
Contamination Levels ◽  
The Gulf Of Finland ◽  
Neva Bay

This project defines the pre-industrial quantities of heavy metals in sediment sequences of the Late Holocene from the Eastern Gulf of Finland. A comparative analysis reveals differences and similarities in the current concentrations of heavy metals in bottom sediments and pre-industrial levels. It is found that the maximum concentrations of heavy metals in the bottom sediments of the Gulf of Finland and Neva Bay occurred in the period of 1950-1990. Since the 1990s, the trend has been a slow decline in the contamination levels; however, the concentrations of some heavy metals in bottom sediments remain high.

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