Potential for internal loading by phosphorus based on sequential extraction of surficial sediment in a shallow Egyptian Lake

2010 ◽  
Vol 178 (1-4) ◽  
pp. 203-212 ◽  
Author(s):  
Maha Ahmed Mohamed Abdallah
Keyword(s):  
Sequential Extraction ◽  
Internal Loading ◽  
Surficial Sediment

Nearshore surficial sediment textures; Beaufort Sea, Alaska

1980 ◽  
Author(s):  
Peter W. Barnes ◽  
Erk Reimnitz ◽  
Robin Ross
Keyword(s):  
Beaufort Sea ◽  
Surficial Sediment

scholarly journals Sequential extraction procedure to obtain the composition of terrigenous detritus in marine sediments

MethodsX ◽  
2020 ◽  
Vol 7 ◽  
pp. 100888
Author(s):  
Margit H. Simon ◽  
Daniel P. Babin ◽  
Steven L. Goldstein ◽  
Merry Yue Cai ◽  
Tanzhuo Liu ◽  
...  
Keyword(s):  
Sequential Extraction ◽  
Marine Sediments ◽  
Extraction Procedure ◽  
Sequential Extraction Procedure

The Use of a Sequential Extraction Technique to Characterize Soil Trace Evidence Recovered from a Spade in a Murder Case in Brazil*

2020 ◽  
Vol 65 (6) ◽  
pp. 1921-1934 ◽  
Author(s):  
Samara Alves Testoni ◽  
Vander Freitas Melo ◽  
Lorna Anne Dawson ◽  
Joice Malakoski ◽  
Edimar Cunico ◽  
...  
Keyword(s):  
Sequential Extraction ◽  
Extraction Technique ◽  
Trace Evidence

scholarly journals An Assessment of Heavy Metal Contamination in the Nakdong River Around the Weir

Water ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 684
Author(s):  
Hee Won Son ◽  
Sun Hee Shim ◽  
Haeseong Oh ◽  
Jung Hyun Choi
Keyword(s):  
Heavy Metals ◽  
Sequential Extraction ◽  
Environmental Protection Agency ◽  
Heavy Metal Contamination ◽  
Environmental Research ◽  
Residual Fraction ◽  
Nakdong River ◽  
Risk Assessment Code ◽  
The Nakdong River ◽  
Reducible Fraction

In this study, the concentrations and characteristics of copper (Cu), zinc (Zn), and lead (Pb) contamination in sediment samples were investigated using aqua regia extraction and Tessier’s five-step sequential extraction. Based on the concentration of metals, the influence of the Hapcheon-Changnyeong weir on sediments in the Nakdong River was assessed. The origins of the contaminants, their bioavailability, and their mobility were determined using sequential extraction. Greater concentrations of heavy metals were found in samples collected closer to the weir. The largest proportion of Cu was identified in the residual fraction based on sequential extraction, whereas Zn was predominantly found in the reducible fraction. Iron-manganese in the reducible fraction of Zn has the potential to leach back to the water body. In addition, the combined concentration of fractions 1 and 2 of Cu comprised more than 20% of total amount that still has potential to affect the water quality. The results of this study were compared with existing sediment standards set out by the NIER (National Institute of Environmental Research), Canada, and US EPA (United States Environmental Protection Agency) guidelines, as well as the risk assessment code (RAC). The concentrations of heavy metals exceeded the standards set by the Canadian guideline by up to four times in particular samples, highlighting the need for continual monitoring.

scholarly journals In-stream oxygenation to mitigate internal loading of phosphorus in lowland streams

2020 ◽  
Vol 590 ◽  
pp. 125536
Author(s):  
Toon van Dael ◽  
Toon De Cooman ◽  
Erik Smolders
Keyword(s):  
Internal Loading ◽  
Lowland Streams

Environmental Availability of Potentially Toxic Elements in an Agricultural Mediterranean Site

2019 ◽  
Vol 25 (2) ◽  
pp. 169-178 ◽  
Author(s):  
Dimitrios Alexakis ◽  
Dimitra Gamvroula ◽  
Eleni Theofili
Keyword(s):  
Sequential Extraction ◽  
Toxic Elements ◽  
Soil Depth ◽  
Extraction Procedure ◽  
Potential Ecological Risk ◽  
Potentially Toxic Elements ◽  
Geochemical Partitioning ◽  
Exchangeable Fraction ◽  
High Bioavailability

ABSTRACT Total contents of 36 potentially toxic elements are summarized for agricultural topsoil (n = 12; soil depth = 0–20 cm), subsoil (n = 12; soil depth = 20–40 cm), and representative rock samples collected from a Mediterranean site (Megara Plain, Greece). The five-stage sequential extraction procedure for the geochemical partitioning of cadmium (Cd), cobalt (Co), chromium (Cr), copper (Cu), manganese (Mn), and nickel (Ni), proposed by Tessier, was applied to topsoil and subsoil collected from the study area. Soil Cd was highly associated with exchangeable fraction, illustrating high bioavailability of this element. The order of mobility of the elements was as follows: Cd > Cu > Co > Zn > Ni > Cr > Mn. Results from sequential extraction experiments illustrated that the bioavailability of Cu, Co, and Zn is moderate, while Ni, Cr, and Mn presented low bioavailability, indicating that these elements could pose a limited threat to the quality of crops. Cadmium is the chief contamination controlling factor posing moderate potential ecological risk. The contamination sources of the examined elements are discussed.

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