Phosphorus Adsorption-Desorption Isotherm of Lime Treated and Untreated Acid Soils of Assosa and Bambasi Districts, West Ethiopia

2020 ◽  
Vol 51 (15) ◽  
pp. 1979-1990
Author(s):  
Mathewos Bekele ◽  
Fassil Kebede ◽  
Wassie Haile
Chemosphere ◽  
2011 ◽  
Vol 83 (7) ◽  
pp. 1028-1034 ◽  
Author(s):  
Cristina Pérez-Novo ◽  
David Fernández-Calviño ◽  
Alipio Bermúdez-Couso ◽  
José E. López-Periago ◽  
Manuel Arias-Estévez

2015 ◽  
Vol 3 (5) ◽  
pp. 387-395 ◽  
Author(s):  
Pratap Bhattacharyya ◽  
Amaresh Kumar Nayak ◽  
Mohammad Shahid ◽  
Rahul Tripathi ◽  
Sangita Mohanty ◽  
...  

Environments ◽  
2020 ◽  
Vol 7 (10) ◽  
pp. 72
Author(s):  
Ioannis Zafeiriou ◽  
Dionisios Gasparatos ◽  
Ioannis Massas

Selenium adsorption/desorption behavior was examined for eight Greek top soils with different properties, aiming to describe the geochemistry of the elements in the selected soils in terms of bioavailability and contamination risk by leaching. Four soils were acid and four alkaline, and metal oxides content greatly differed between the two groups of soils. The concentrations of Se(IV) used for the performed adsorption batch experiments ranged from 1 to 50 mg/L, while the soil to solution ratio was 1 g/0.03 L. Acid soils adsorbed significantly higher amounts of the added Se(IV) than alkaline soils. Freundlich and Langmuir equations adequately described the adsorption of Se(IV) in the studied soils, and the parameters of both isotherms significantly correlated with soil properties. In particular, both KF and qm values significantly positively correlated with ammonium oxalate extractable Fe and with dithionite extractable Al and Mn, suggesting that amorphous Fe oxides and Al and Mn oxides greatly affect exogenous Se(IV) adsorption in the eight soils. These two parameters were also significantly negatively correlated with soil electrical conductivity (EC) values, indicating that increased soluble salts concentration suppresses Se(IV) adsorption. No significant relation between adsorbed Se(IV) and soil organic content was recorded. A weak salt (0.25 M KCl) was used at the same soil to solution ratio to extract the amount of the adsorbed Se(IV) that is easily exchangeable and thus highly available in the soil ecosystem. A much higher Se(IV) desorption from alkaline soils was observed, pointing to the stronger retention of added Se(IV) by the acid soils. This result implies that in acid soils surface complexes on metal oxides may have been formed restricting Se desorption.


RSC Advances ◽  
2017 ◽  
Vol 7 (59) ◽  
pp. 37441-37446 ◽  
Author(s):  
Qingzhi Wang ◽  
Jiankun Liu ◽  
Lingqing Wang

Freeze–thaw cycles (FTCs) can strongly influence the physical and chemical properties of soils in cold regions, which can in turn affect the adsorption–desorption characteristics of phosphorus (P) in the soil.


2014 ◽  
Vol 535 ◽  
pp. 293-297
Author(s):  
Wen Jun Yang ◽  
Jian Li ◽  
Zhong Wu Jin

These years the water quality deteriorated in Xiangxi River (XXR)---one tributary of Yangtze River in the Three Gorges Project reservoir area. Many components existed in XXR such as nutrients, suspended sediment (SS) and phytoplankton. The nutrients containing phosphorus could be adsorbed to the fine SS, which influenced the water quality components cycling obviously. For calculating the concentrations of different forms of phosphates (mainly the dissolved phosphate and particulate phosphate) more precisely, the formula was deduced based on the Langmuir equation and modified Langmuir equation. Then the field observed data were used to validate the deduced formula, which showed that the deduced formula can calculate the concentrations well. The formula could be applied for the water quality or ecological modeling, and also provide more information for water quality improvement. Keywords: Suspended sediment; Phosphorus; Adsorption-desorption; Xiangxi River


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