QUT ePrints

Thermal decomposition of humboldtine - a high resolution thermogravimetric and hot stage Raman spectroscopic study

Frost, Ray L. & Weier, Matt L. (2004) Thermal decomposition of humboldtine - a high resolution thermogravimetric and hot stage Raman spectroscopic study. Journal of Thermal Analysis and Calorimetry, 75(1), pp. 277-291.

View at publisher

Abstract

Evidence for the existence of primitive life forms such as lichens and fungi can be based upon the formation of oxalates. These oxalates form as a film like deposit on rocks and other host matrices. Humboldtine as the natural iron(II) oxalate mineral is a classic example. Thermogravimetry coupled to evolved gas mass spectrometry shows dehydration takes place in two steps at 130 and 141 °C. Loss of the oxalate as carbon dioxide occurs at 312 and 332 °C. Dehydration is readily followed by Raman microscopy in combination with a thermal stage and is observed by the loss of intensity of the OH stretching vibration at 3318 cm-1. The application of infrared emission spectroscopy supports the results of the TG-MS. Three Raman bands are observed at 1470, 1465 and 1432 cm-1 attributed the CO symmetric stretching mode. The observation of the three bands supports the concept of multiple iron(II) oxalate phases. The significance of this work rests with the ability of Raman spectroscopy to identify iron(II)oxalate which often occurs as a film on a host rock.

Impact and interest:

32 citations in Scopus
Search Google Scholar™
32 citations in Web of Science®

Citation countsare sourced monthly from Scopus and Web of Science® citation databases.

These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards.

Citations counts from the Google Scholar™ indexing service can be viewed at the linked Google Scholar™ search.

Full-text downloads:

831 since deposited on 14 Mar 2005
73 in the past twelve months

Full-text downloadsdisplays the total number of times this work’s files (e.g., a PDF) have been downloaded from QUT ePrints as well as the number of downloads in the previous 365 days. The count includes downloads for all files if a work has more than one.

ID Code: 838
Item Type: Journal Article
Keywords: oxalate, humboldtine, high resolution thermogravimetric analysis, hot stage Raman spectroscopy, infrared emission spectroscopy
DOI: 10.1023/B:JTAN.0000017349.31035.dd
ISSN: 1572-8943
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > INORGANIC CHEMISTRY (030200)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2004 Springer
Copyright Statement: The original publication is available at SpringerLink.
Deposited On: 14 Mar 2005
Last Modified: 29 Feb 2012 23:04

Export: EndNote | Dublin Core | BibTeX

Repository Staff Only: item control page