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Surface Charge Manipulation of Constant Surface Potential Soil Colloids: I. Relation to Sorbed Phosphorus
Author(s) -
Wann S. S.,
Uehara G.
Publication year - 1978
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1978.03615995004200040006x
Subject(s) - point of zero charge , surface charge , oxisol , electrolyte , phosphorus , adsorption , chemistry , colloid , charge (physics) , charge density , double layer (biology) , zero point energy , inorganic chemistry , analytical chemistry (journal) , layer (electronics) , environmental chemistry , soil water , soil science , physics , organic chemistry , geology , electrode , quantum mechanics
A significant correlation was found between the zero point of charge and the quantity of phosphorus applied to soil material from an Oxisol. Sorbed phosphorus lowered the zero point of charge and increased surface charge density at any pH above the zero point of charge. The soil was treated with 0, 100, 500, and 1,500 ppm P as (NH 4 ) 2 HPO 4 . For the soil with no added phosphorus, low concentration of monovalent electrolyte and within two pH units of the zero point of charge, diffuse layer theory adequately predicted surface charge. For high electrolyte concentration and high pH, the Stern theory with specific adsorption energy predicted the experimental results. The calculated results indicated charge reversal in the high‐phosphorus samples.