Direct Observation of Phosphate Precipitation in the Goethite/Phosphate System
- 1 September 1988
- journal article
- research article
- Published by Wiley in Soil Science Society of America Journal
- Vol. 52 (5) , 1492-1500
- https://doi.org/10.2136/sssaj1988.03615995005200050054x
Abstract
A combined scanning Auger, XPS, scanning SIMS, and TEM (electron diffraction) investigation of naturally‐occurring goethite surfaces in contact with 10−3 M KH2PO4 solution for 90 d at 60 °C has shown that isolated crystallites of the mineral griphite, Fe3Mn2(PO4)2.5(OH)2, are formed by reprecipitation from solution. No adsorbed phosphate can be detected on the goethite surface above 0.1 atomic % and there is no phosphate penetration of the goethite crystals. Evidence concerning initial adsorption of phosphate, before recrystallization, is reconsidered. The results suggest that phosphate retention in Fe oxide systems may be due primarily to precipitation rather than adsorption.Funding Information
- Surface Science Western
This publication has 1 reference indexed in Scilit:
- X‐ray Photoelectron Studies of Anion Adsorption on GoethiteSoil Science Society of America Journal, 1987