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Phosphorus adsorption and desorption properties of three synthetic iron oxides and their relation to phosphorus adsorption saturation

SHAO Xing-hua~1,ZHANG Yong-song~(1,2*),LIN Xian-yong~(1,2),DU Shao-ting~1,YU Cheng-yan~1(1 MOE Key Lab.of Environ.Remediation and Ecosystem Health,College of Natural Resour.and Environ.Sci.,Zhejiang Univ.,310029 Hangzhou,China;2 State Key Lab.of Soil and Sustainable Agri.,Inst.of Soil Sci.,CAS,Nanjing 210008,China)  
The differences of P adsorption-desorption characteristics of amorphous and crystalline iron oxides and their(relation) to P adsorption saturation were studied by using three synthetic iron oxides.The results showed that P adsorption properties of these three synthetic iron oxides could be described by Langumir equation with a correlation coefficient larger than 0.9 being statistical significant at 1% level.It was found by comprehensively taking Q_m(maximum quantity of adsorption),K(adsorption constant) and MBC(maximum buffing capacity) into account,ferrihydrate(amorphous) was much larger than crystalline iron oxides(goethite and hematite) in both intensity and capacity of P adsorption.P adsorbed by ferrihydrate was much more difficult to be desorbed than those by goethite and hematite.The large active surfaces of ferrihydrate contribute little on P desorption.It was suggested by our results that P adsorption saturation might be a promising integrated index for estimating the intensity and capacity of P adsorption-desorption in soils or iron oxides.
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