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Distinguishing calcium carbonate from calcium sulfate dihydrate by instrumental methods. A set of laboratory experiments for analytical chemistry and spectroscopy

Garribba, Eugenio and Micera, Giovanni and Panzanelli, Angelo and Strinna Erre, Liliana and Stara, Giovanna (2001) Distinguishing calcium carbonate from calcium sulfate dihydrate by instrumental methods. A set of laboratory experiments for analytical chemistry and spectroscopy. Journal of Chemical Education, Vol. 78 (8), p. 1090. ISSN 0021-9584. Article.

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Abstract

A project is proposed in which instrumental techniques are used to identify and characterize calcium sulfate and calcium carbonate or materials based on these compounds. The project involves thermogravimetry, IR and NIR vibrational spectroscopy, and X-ray fluorescence. Thermogravimetry measures the weight loss of the samples upon controlled heating and determines both water content and residue. FTIR spectra in the middle IR region are of particular interest. Because of solid-state effects, the theoretical interpretation requires knowledge of the symmetry of the molecules and the space group of the crystal. NIR spectra introduce the students to the analysis of nonfundamental vibrations and prove the presence of water in CaSO4·2H2O. X-ray fluorescence spectra, obtained on a homemade EDXRF instrument, discriminate CaSO4·2H2O from CaCO3 on the basis of the K lines of S and Ca. The lab sequence is very stimulating and provides a solid introduction to a variety of instrumental and spectroscopic methods, including their theoretical background. Although the project is designed for several techniques, each of the experiments may be used in a stand-alone manner.

Item Type:Article
ID Code:390
Status:Published
Refereed:Yes
Uncontrolled Keywords:Analytical chemistry, instrumental methods, IR spectroscopy, laboratory instruction, thermal analysis
Subjects:Area 03 - Scienze chimiche > CHIM/03 Chimica generale e inorganica
Area 03 - Scienze chimiche > CHIM/01 Chimica analitica
Divisions:001 Università di Sassari > 01 Dipartimenti > Chimica
001 Università di Sassari > 03 Istituti > Matematica e fisica
Publisher:American Chemical Society
ISSN:0021-9584
Deposited On:18 Aug 2009 10:02

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