NDLI: Effect of pH on the release of soil colloidal phosphorus

Content Provider	Springer Nature Link
Author	Liang, Xinqiang Liu, Jin Chen, Yingxu Li, Hua Ye, Yushi Nie, Zeyu Su, Miaomiao Xu, Zhihong
Copyright Year	2010
Abstract	Colloid-facilitated phosphorus (P) has been proved as a significant contributor to eutrophication. Release of colloidal phosphorus (P$_{coll}$) depends on the released soil colloids and their P adsorption abilities, both of which are greatly affected by pH. The aim of the study was to assess the effect of pH in a wide range on P$_{coll}$ loss of the top silt loamy soil rich in organic matter and P for the successful description and prediction of P transport.In batch experiment, soil samples were shaken with deionized water in a wide range of pH from 1.4 to 9.9 for 24 h. Then water-dispersible colloids (WDCs) were extracted by pre-centrifugation, microfiltration, and ultracentrifugation processes orderly and determined gravimetrically. The P$_{coll}$ values at each pH were calculated as the difference between the concentration of total P in non-ultracentrifuged and ultracentrifuged samples. The same method was applied for the released colloidal mineral elements (Al, Fe, Ca, Si, Mg, Mn). Colloid morphology and P distribution on colloid surface were directly illustrated by transmission electron microscope (TEM) and scanning electron microscope-energy-dispersive X-ray spectroscopy (SEM-EDS) mapping scanning analyses.Over pH 4.6–6.0, the released P$_{coll}$ was below 5.5 mg kg$^{–1}$ soil, while up to 66.8 mg kg$^{–1}$ soil and 28.5 mg kg$^{–1}$ soil at pH 1.4 and 9.9, respectively, indicating that both high and low pH values enhanced the mobilization of P$_{coll}$. At the low pH, the potential loss of P$_{coll}$ mainly resulted from the dissolution of inorganic encasing cement such as Al oxides and clay mineral. However, besides electrostatic repulsion, dissolution of organic coating at high pH enhanced the P$_{coll}$ release as revealed by the SEM-EDS results. The P was heterogeneously distributed on the WDCs and might be associated with soil organic matter, Al oxides, Fe oxides (oxyhydroxide), and clay mineral at the low pH, while mainly with Fe oxides and less clay mineral at the high pH.Both high and low pH enhanced colloid and P$_{coll}$ releases. This study first visually revealed that the dissolution of organic cement at high pH enhanced the release of WDCs and their facilitated P$_{coll}$ release. The exceptional loss risk of P$_{coll}$ may be caused by soil acidification due to the dissolution of inorganic cements, especially in Al-rich soils, and by the enhanced high soil pH due to the dissolution of organic coating in the organic matter-rich soils.
Starting Page	1548
Ending Page	1556
Page Count	9
File Format	PDF
ISSN	14390108
Journal	Journal of Soils and Sediments
Volume Number	10
Issue Number	8
e-ISSN	16147480
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-08-03
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Al oxides Encasing cement Organic matter pH Water dispersible colloidal phosphorus Environmental Physics Environment Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Stratigraphy Earth-Surface Processes

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