NDLI: Investigation of phosphorus fractions and isotherm equation on the lake sediments in Ekbatan Dam (Iran)

Content Provider	Springer Nature Link
Author	Shoja, Hojat Rahimi, Ghasem Fallah, Mahboobeh Ebrahimi, Eisa
Copyright Year	2017
Abstract	Phosphorus (P) is one of the main elements involved in the eutrophication of surface water bodies, which negatively affect the water quality. Reservoir dams are local for the accumulation of sediments transported from upstream. The amount of P release from sediments to water is potentially controlled by the retention characteristics of sediments. In this regard, 100 sediment samples were taken from surface sediments to determine the P retention capacity of sediments in Ekbatan Dam, Hamadan, Iran, and 15 water samples were collected from the interface of bottom sediments with lake water to determine different types of water P, including water-soluble P (WSP), dissolved reactive P (DRP), suspended solids P (SSP), and total P (TP). Firstly, some physical and chemical properties of sediments such as pH, cation exchangeable capacity (CEC), organic carbon (OC) content, equivalent CaCO$_{3}$ (TNV), aluminum (Al) and iron (Fe) content were measured, and then WSP, TP, SSP, and DRP as well as P isotherms were determined. Moreover, three isotherm equations of Freundlich, Langmuir, and Temkin were fitted to the experimental data. Finally, the map of spatial variation of degree of P saturation (DPS) was plotted. The results revealed that the amount of DRP in water was at high level (0.02 mg L$^{−1}$). The maximum adsorption in the sediments ranged from 83.93 to 634.13 mg kg$^{−1}$ that was significantly correlated with the physical and chemical properties of sediments, such as clay percentage, OC, and TNV. The equilibrium concentration of P at zero point was significantly higher than DRP. This demonstrated the release of P from sediments into water. P binding energy in the sediments ranged from 0.03 to 5.48 L mg$^{−1}$. There was a significant correlation between the binding energy and oxalate-extractable Fe, representing that the poorly crystalline or amorphous Fe would play a dominate role in the P adsorption under the slightly alkaline condition. The results suggested that the sediments not only had high P adsorption capacity and binding energy but released loosely bound WSP to water as well, which can cause eutrophication in the long term.
Starting Page	1
Ending Page	15
Page Count	15
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	76
Issue Number	6
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2017-03-14
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Adsorption capacity Freundlich Langmuir Temkin Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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