DIRECT OBSERVATION OF PHOSPHATE PRECIPITATION IN THE GOETHITE PHOSPHATE SYSTEM

被引：57

作者：

MARTIN, RR ^{[1
]}

SMART, RSC ^{[1
]}

TAZAKI, K ^{[1
]}

机构：

[1] GRIFFITH UNIV,SCH SCI,NATHAN,QLD 4111,AUSTRALIA

来源：

SOIL SCIENCE SOCIETY OF AMERICA JOURNAL | 1988年 / 52卷 / 05期

关键词：

Iron Oxides - Minerals--Crystallization - Phosphates--Precipitation;

D O I：

10.2136/sssaj1988.03615995005200050054x

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

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 days 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.

引用

页码：1492 / 1500

页数：9

共 23 条

[1] KINETICS OF ISOTOPIC-EXCHANGE OF PHOSPHATE AT ALPHA-FEOOH-AQUEOUS SOLUTION INTERFACE [J].