scholarly journals Distribution of heavy metals in the core sediments of a tropical wetland system

2009 ◽  
Vol 6 (2) ◽  
pp. 225-232 ◽  
Author(s):  
P. S. Harikumar ◽  
U. P. Nasir ◽  
M. P. Mujeebu Rahman
Keyword(s):  
Heavy Metals ◽  
Core Sediments ◽  
The Core ◽  
Wetland System

Variation characteristics of heavy metals and nutrients in the core sediments of Taihu Lake and their pollution history

2006 ◽  
Vol 49 (S1) ◽  
pp. 82-91 ◽  
Author(s):  
Enfeng Liu ◽  
Ji Shen ◽  
Xingqi Liu ◽  
Yuxin Zhu ◽  
Sumin Wang
Keyword(s):  
Heavy Metals ◽  
Taihu Lake ◽  
Pollution History ◽  
Core Sediments ◽  
The Core ◽  
Variation Characteristics

Study on Release Potential of Heavy Metals in Sediments from Baihua Lake by Dredging Simulation

2014 ◽  
Vol 878 ◽  
pp. 545-550 ◽  
Author(s):  
Yi Wang ◽  
Xian Fei Huang ◽  
Ji Wei Hu
Keyword(s):  
Heavy Metals ◽  
Environmental Protection Agency ◽  
Water Source ◽  
The United States ◽  
Drinking Water Source ◽  
Sediment Dredging ◽  
Core Sediments ◽  
The Core ◽  
Body Core ◽  
Release Potential

Baihua Lake is a key drinking water source for Guiyang City located on Guizhou Plateau in southwest China, however it has been seriously contaminated with various contaminants, such as nitrogen, phosphorus, and heavy metals. To solve this problem, some researchers have recommended dredging the lake sediment to remove these contaminants. The present research was aimed to assess the potential risk of five selected heavy metals (Cd, Cu, Cr, Hg and As) if the sediment dredging measure was taken for remediation of this water body. Core sediments collected from the site Guanyinshanzhuang were used to simulate the release of heavy metals in sediment from Baihua Lake if sediment dredging was carried out. The core sediments were dredged at 10 cm, 20 cm and 30 cm levels. The core sediments were then put into the lake again after simulation dredging to investigate their release potential in one day, five days, nine days and fifteen days. The mobility of selected heavy metals in the sediments were determined using the toxicity characteristic leaching procedure (TCLP) developed by the United States Environmental Protection Agency (USEPA). The results indicated that the release potential of the heavy metals varies with dredging depth and the lasting time after dredging. Cr and As showed the lowest release ability among the heavy metals under study followed by Cu. The release amount of Cd increased with the lasting time after dredging. Hg showed no clear trends of release at 10 cm dredging depth. At 20 cm and 30 cm dredging depth, Hg presented a small release in the five days after simulation dredging, and then no release in the following ten days. In fifteen days after simulation dredging, the percentages of the heavy metals extracted with TCLP were in the order of Cd (8.85%) > As (3.41%) > Cu (1.37%) > Hg (0.79%) > Cr (0.61%) at dredging depth of 10 cm, Cd (10.22%) > Hg (2.73%) > Cu (1.74%) >As (1.47%)> Cr (1.41%) at dredging depth of 20 cm, and Cd (10.38%) > As (2.07%) > Hg (2.51%) > Cu (1.74%) > Cr (0.87%) at dredging depth of 30 cm.

Heavy metals in top core sediments from the southern Campania shelf (Italy): Hints to define large-scale geochemical backgrounds

2006 ◽  
Vol 22 (1) ◽  
pp. 65-91 ◽  
Author(s):  
Mario Sprovieri ◽  
Simone Sammartino ◽  
Daniela Salvagio Manta ◽  
Ennio Marsella ◽  
Luciana Ferraro
Keyword(s):  
Heavy Metals ◽  
Large Scale ◽  
Core Sediments

Heavy metals in an impacted wetland system: A typical case from southwestern China

2007 ◽  
Vol 387 (1-3) ◽  
pp. 257-268 ◽  
Author(s):  
Xiangyang Bi ◽  
Xinbin Feng ◽  
Yuangen Yang ◽  
Xiangdong Li ◽  
Grace P.Y. Sin ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Typical Case ◽  
Southwestern China ◽  
System A ◽  
Wetland System

scholarly journals Molecular Characterization of Potential Nitrogen Fixation by Anaerobic Methane-Oxidizing Archaea in the Methane Seep Sediments at the Number 8 Kumano Knoll in the Kumano Basin, Offshore of Japan

2009 ◽  
Vol 75 (22) ◽  
pp. 7153-7162 ◽  
Author(s):  
Junichi Miyazaki ◽  
Ryosaku Higa ◽  
Tomohiro Toki ◽  
Juichiro Ashi ◽  
Urumu Tsunogai ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
16S Rrna ◽  
16S Rrna Gene ◽  
Gene Clusters ◽  
Rrna Gene ◽  
Methane Seep ◽  
Core Sediments ◽  
The Core ◽  
Group 2

ABSTRACT The potential for microbial nitrogen fixation in the anoxic methane seep sediments in a mud volcano, the number 8 Kumano Knoll, was characterized by molecular phylogenetic analyses. A total of 111 of the nifH (a gene coding a nitrogen fixation enzyme, Fe protein) clones were obtained from different depths of the core sediments, and the phylogenetic analysis of the clones indicated the genetic diversity of nifH genes. The predominant group detected (methane seep group 2), representing 74% of clonal abundance, was phylogenetically related to the nifH sequences obtained from the Methanosarcina species but was most closely related to the nifH sequences potentially derived from the anoxic methanotrophic archaea (ANME-2 archaea). The recovery of the nif gene clusters including the nifH sequences of the methane seep group 2 and the subsequent reverse transcription-PCR detection of the nifD and nifH genes strongly suggested that the genetic components of the gene clusters would be operative for the in situ assimilation of molecular nitrogen (N2) by the host microorganisms. DNA-based quantitative PCR of the archaeal 16S rRNA gene, the group-specific mcrA (a gene encoding the methyl-coenzyme M reductase α subunit) gene, and the nifD and nifH genes demonstrated the similar distribution patterns of the archaeal 16S rRNA gene, the mcrA groups c-d and e, and the nifD and nifH genes through the core sediments. These results supported the idea that the anoxic methanotrophic archaea ANME-2c could be the microorganisms hosting the nif gene clusters and could play an important role in not only the in situ carbon (methane) cycle but also the nitrogen cycle in subseafloor sediments.

Speciation Analysis of Heavy Metals of Core Amuta Sediments in Lianhua Lake

2010 ◽  
Vol 113-116 ◽  
pp. 716-719
Author(s):  
Fu Hua Xuan ◽  
Shu Ying Zang
Keyword(s):  
Heavy Metals ◽  
Speciation Analysis ◽  
Chemical Forms ◽  
Organic Sulfide ◽  
The Core ◽  
Mn Oxide ◽  
Binding Forms ◽  
Residue Fraction

The BCR-SEP method was used to determine the binding forms of heavy metals in Amuta Lake(AMT) in this paper. The chemical forms of heavy metals, namely extractable fractions or valid fractions, including exchangeable-carbonate fraction, Fe-Mn oxide fraction and Organic-sulfide fraction .The results of the partitioning study indicated that in the core AMT sediments, Cr, Fe and Ni are mainly associated with the residue fraction, Cu is mainly concentrated in the Fe–Mn oxide fractions and residue fraction, Mn is concentrated in the exchangeable-carbonate fraction and residue fraction. Zn is concentrated in organic-sulfide fraction and residue fraction.

Biodegradation and kinetics of organic compounds and heavy metals in an artificial wetland system (AWS) by using water hyacinths as a biological filter

2018 ◽  
Vol 20 (1) ◽  
pp. 35-43 ◽  
Author(s):  
P. F. Rodríguez-Espinosa ◽  
J. A. Mendoza-Pérez ◽  
J. Tabla-Hernandez ◽  
E. Martínez-Tavera ◽  
M. M. Monroy-Mendieta
Keyword(s):  
Heavy Metals ◽  
Organic Compounds ◽  
Artificial Wetland ◽  
Biological Filter ◽  
Wetland System ◽  
Water Hyacinths ◽  
Kinetics Of

scholarly journals Spatial and temporal distribution of heavy metals in coastal core sediments from the Red Sea, Saudi Arabia

Oceanologia ◽  
2017 ◽  
Vol 59 (3) ◽  
pp. 262-270 ◽  
Author(s):  
Bandar A. Al-Mur ◽  
Andrew N. Quicksall ◽  
Ahmed M.A. Al-Ansari
Keyword(s):  
Heavy Metals ◽  
Saudi Arabia ◽  
Red Sea ◽  
Temporal Distribution ◽  
Spatial And Temporal Distribution ◽  
Core Sediments

scholarly journals Ratios of Organic Carbon to Nitrogen in the Core Sediments from Lake Kojima

1978 ◽  
Vol 39 (1) ◽  
pp. 15-21 ◽  
Author(s):  
Motomu NIKAIDO
Keyword(s):  
Organic Carbon ◽  
Core Sediments ◽  
The Core

scholarly journals Distribution of heavy metals in various compartments of the constructed wetland system in Przywidz

2019 ◽  
pp. 297-305
Author(s):  
Hanna Obarska-Pempkowiak ◽  
Katarzyna Klimkowska
Keyword(s):  
Heavy Metals ◽  
Constructed Wetland ◽  
Treatment Plant ◽  
Domestic Sewage ◽  
Point Of View ◽  
Filling Material ◽  
Toxic Heavy Metals ◽  
Wetland System ◽  
Cascade Filter ◽  
The Hill

In the last decade constructed wetlands have become a very popular technology for removal of contaminants from domestic sewage. They are also assesed from the point of view of their capacity for removal of toxic heavy metals and organic substances resistant to degradation. Constructed wetland in Przywidz localized about 60 km from Gdansk is a pilot wastewater treatment plant (WWTP) designed for 150 PE (person equivalent). The system consists of two sections: vegetated submerged bed (VSB) with horizontal flow of sewage and a cascade filter situated on a slope of a hill. Domestic sewage after a conventional pretreatment ( consists of an Imhoff tank and a trickling filter) is pumped to the VSB filter located on slope of the hill. Total area of constructed wetland is about 870 m2. In the period 1995-98 the measurments of several heavy metals (Cd, Cu, Pb) were carried out. These measurments were carried out in inflowing and outflowing sewage and as well in samples collected from each section of constructed wetland system. In particular analysis of sediment collected in ditches of the cascade filter, filling material of the dykes, VSB filter and plants were carried out. It was found out that content of heavy metals in suspended soil decreased along the course of treatment, starting from VSB filter, through the first ditch to the last ditch. Measurable concentration of dissolved heavy metals were found in sewage collected from several subsequent ditches. The main mechanism of removal on particular matter in subsequent ditches was sorption.

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