Thermal identification of goethite in soils and sediments by diffuse reflectance spectroscopy

Zhou, Wei, Chen, Lingxiao, Zhou, Mo, Balsam, William L. and Ji, Junfeng (2010) Thermal identification of goethite in soils and sediments by diffuse reflectance spectroscopy. Geoderma, 155 3-4: 419-425. doi:10.1016/j.geoderma.2010.01.001


Author Zhou, Wei
Chen, Lingxiao
Zhou, Mo
Balsam, William L.
Ji, Junfeng
Title Thermal identification of goethite in soils and sediments by diffuse reflectance spectroscopy
Journal name Geoderma   Check publisher's open access policy
ISSN 0016-7061
1872-6259
Publication date 2010-03-15
Sub-type Article (original research)
DOI 10.1016/j.geoderma.2010.01.001
Volume 155
Issue 3-4
Start page 419
End page 425
Total pages 7
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Collection year 2011
Language eng
Abstract Goethite (Gt) is an important iron mineral in soils and sediments. Conventional measurements cannot effectively identify it at the low concentrations typical of soils and sediments. In this paper we demonstrate that diffuse reflectance spectroscopy (DRS) in conjunction with thermal treatment provides a definitive technique for identifying Gt in soil and sediments. The DRS pattern of Gt exhibits diagnostic changes of the first derivative value (FDV) peaks after heating to 300 °C, whereas hematite (Hm) displays no shift in peak wavelength after heating. The degree of thermal changes induced in a sample depends on the concentration of both Gt and Hm. Application of this technique to natural soils and sediments demonstrates that it can effectively detect Gt even at very low concentrations in soils and sediments. © 2010 Elsevier B.V. All rights reserved.
Keyword Diffuse reflectance spectroscopy
Goethite
Hematite
Thermal treatment
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Earth Sciences Publications
Official 2011 Collection
 
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Created: Sun, 04 Apr 2010, 00:05:22 EST