scholarly journals HEAVY METAL CONCENTRATIONS IN SEDIMENT CORES FROM DIFFERENT MANGROVE FORESTS IN DA LOC COMMUNE, HAU LOC DISTRICT, THANH HOA PROVINCE, VIETNAM

2018 ◽  
Vol 34 (3) ◽  
Author(s):  
Minh Tran Thi
Keyword(s):  
Heavy Metal ◽  
Mangrove Forest ◽  
Sediment Cores ◽  
Sediment Quality ◽  
Organic Matter Content ◽  
Depositional Environments ◽  
Silty Sand ◽  
Mangrove Forests ◽  
Metal Concentrations ◽  
Heavy Metal Concentrations

In order to clarify heavy metal concentration profiles in different mangrove forest ages, four sediment cores (up to 100 cm in depth) were collected and tested for their physicochemical characteristics (pH, Eh, organic matters and grain size) and heavy metal concentrations. Results showed that mangrove sediments were composed mainly of sandy silt, silty sand, silt, sandy mud and mud. The average mud content in the sediment cores continuously increased with mangrove forest ages from one, nine, nineteen and twenty years old, whereas the mud content highly fluctuated with the core depth. pH, Eh and organic matter content implied that the sedimentary depositional environments were classified as weak alkaline and anaerobic. The Cu and Zn concentrations in the sediment cores from the intertidal zone exceeded the TEL values in Canadian Interim Marine Sediment Quality Guideline (ISQGs) values, while, Pb concentration exceeded the PEL level. When compared with National Technical Regulation on Sediment Quality QCVN43:2012/BTNMT, sediment samples were polluted by Cu and Pb.

scholarly journals Heavy metal concentrations and sediment quality of a cage farm on Lake Volta, Ghana

2020 ◽  
Vol 51 (5) ◽  
pp. 2041-2051
Author(s):  
Anthony Yaw Karikari ◽  
Ruby Asmah ◽  
William Wilson Anku ◽  
Steve Amisah ◽  
Nelson Wheatson Agbo ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Sediment Quality ◽  
Metal Concentrations ◽  
Heavy Metal Concentrations

scholarly journals A Multi-Index Analysis Approach to Heavy Metal Pollution Assessment in River Sediments in the Ponce Enríquez Area, Ecuador

Water ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 590 ◽  
Author(s):  
Alby Aguilar Pesantes ◽  
Elizabeth Peña Carpio ◽  
Tomas Vitvar ◽  
Manuel María Mahamud López ◽  
Juan Menéndez-Aguado
Keyword(s):  
Heavy Metal ◽  
Sediment Quality ◽  
Contamination Factor ◽  
Small Scale ◽  
Mining Operations ◽  
Metal Concentrations ◽  
Geochemical Composition ◽  
Multi Index ◽  
Heavy Metal Concentrations ◽  
Subsurface Sediments

The area of Ponce Enríquez, Southern Ecuador, is one of the most important artisanal and small scale gold mining (ASGM) areas in the country, where informal mining operations can be found using amalgamation technique, even though it has been prohibited since 2010. Considering the potential impact of these mining operations, the present research focused on heavy metal pollutants in subsurface sediments at 214 sampling locations from several detailed sampling campaigns in the rivers Fermín, Fermín Norte, Guanache, Villa, and Siete. Four parameters were calculated to evaluate the geochemical composition of the river sediment and heavy metal concentrations: The enrichment factor (EF), the geo-accumulation index (Igeo), the contamination factor (Cf) and the pollution load index (PLI). The analyzed elements were Cu, Pb, Zn, Ni, As, Cd, Sb, Sr, and Hg. Due to the lack of standards for pollution levels in sediments in Ecuador, Canadian guidelines were used as interim sediment quality guidelines (ISQG) in this research for comparison with the obtained results in subsurface sediments. The multi-index geochemical analysis indicated elevated heavy metal concentrations in all subsurface sediments in the studied river ecosystems.

scholarly journals The history of the sedimentation processes and heavy metal pollution in the Central Danube Delta (Romania)

2018 ◽  
Vol 45 (1) ◽  
pp. 97-106 ◽  
Author(s):  
Róbert-Csaba Begy ◽  
Szabolcs Kelemen ◽  
Hedvig Simon ◽  
Claudiu Tănăselia
Keyword(s):  
Heavy Metal ◽  
Sedimentation Rate ◽  
Sediment Cores ◽  
Hydroelectric Power Station ◽  
Sedimentation Rates ◽  
Danube Delta ◽  
Hydroelectric Power ◽  
Metal Concentrations ◽  
Heavy Metal Concentrations ◽  
Average Sedimentation Rate

Abstract The aim of this study was to investigate the effects of the Iron Gates (IG) hydroelectric power station on the Danube Delta sediment dynamics, and to assess the heavy metal concentrations and pollution in a typical Central Danube Deltaic lake. Eight sediment cores were analysed. The total 210Pb content was measured with 210Po using alpha spectrometry, and the supported 210Pb (226Ra) and 137Cs were measured by gamma spectrometry. The age depth model was derived by applying the 210Pb dating method, and for the calculation of the ages and the sedimentation rates the CRS model was used. The sedimentation rates can be divided into four periods:1940–1972, 1972–1980, 1972–1989 and 1989–2013. In the case of Lake Iacob in the first period, the average sedimentation rate was 0.418 g/cm2y, while in the second it slowly decreased to 0.376 g/cm2y. In the third period, the sedimentation fell to 0.209 g/cm2y, which means the retention of 27.3% of the sediment by the IG dam. In the case of Lake Isac the changes were more visible: in the first period the average sedimentation rate was 0.446 g/cm2y, while in the second it decreased to 0.197 g/cm2y, which means a 42.35% retention of sediment. In the last period, in both cases, a high increase in the sedimentation rate is shown: 0.677 g/cm2y for Lake Iacob and 0.715 g/cm2y for Lake Isac. The heavy-metal concentrations for As, Co, Cr and Ni show decreasing and Hg increasing tendencies, while Cd and Pb show constant values of 310 ± 12 ppb and 9 ± 1 ppm respectively.

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