Phosphate sorptíon in calcareous soils: the role of iron oxide and carbonates
Yükleniyor...
Dosyalar
Tarih
2009
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Chemical Publishing Co.
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Carbonate and oxides minerals in calcareous soils are known to fix large amount of phosphorus in soils. Phosphate adsorption in arid and semi arid regions' soils is very complex due to heterogenity of soil matrix, different phosphorus adsorption ability of soil components and interrelations among the soil components. In this paper equilibrium adsorption isotherms have been obtained for better understanding about the role of carbonate and iron oxides on the behaviour of phosphorus in calcareous soils with large range of carbonate and Fe-oxides content by sequential removal of relevant soil components. Statistical analysis showed that data have well conformed both Langmuir and Freundlich isotherms. After removal of soil carbonates that increased the relative content of iron oxides as compared whole soil, the amount of sorbed phosphorus considerabley decreased by 33.9-68.3 % and after removal of iron oxides some increase or decrease was observed depending on the soil characteristics. Results suggested that soil carbonates permanently affect the phosphorus adsorption, while iron oxides are to reduce phosphorus adsorption in alkaline soils of arid regions.
Açıklama
Anahtar Kelimeler
Adsorption isotherms, Carbonates, Iron oxides, Phosphate, Sequential removal
Kaynak
Asian Journal of Chemistry
WoS Q Değeri
Scopus Q Değeri
Q4
Cilt
21
Sayı
4
