Vibrational spectroscopic study of syngenite formed during the treatment of liquid manure with sulphuric acid

Kloprogge, J. Theo, Schuiling, Roelof D., Ding, Zhe, Hickey, Leisel, Ruan, Huada D., Wharton, David, & Frost, Ray L. (2002) Vibrational spectroscopic study of syngenite formed during the treatment of liquid manure with sulphuric acid. Vibrational Spectroscopy, 28(2), pp. 209-221.

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Syngenite (K2Ca(SO4)2.H2O), formed during treatment of manure with sulphuric acid, was studied by infrared, near-infrared and Raman spectroscopy. Cs site symmetry was determined for the 2 sulphate groups in syngenite (P21/m), so all bands are both infrared and Raman active. The split ○1 (2 Raman + 2 infrared bands) was observed at 981 and 1000 cm-1. The split ○2 (4 Raman + 4 infrared bands) was observed in the Raman spectrum at 424, 441, 471 and 491 cm-1. In the infrared spectrum only 1 band was observed at 439 cm-1. From the split ○3 (6 Raman + 6 infrared) bands 3 298 K Raman bands were observed at 1117, 1138 and 1166 cm-1. Cooling to 77 K resulted in 4 bands at 1119, 1136, 1144 and 1167 cm-1. In the infrared spectrum 5 bands were observed at 1110, 1125, 1136, 1148 and 1193 cm-1. From the split ○4 (6 infrared + 6 Raman bands) 4 bands were observed in the infrared spectrum at 604, 617, 644 and 657 cm-1. The 298 K Raman spectrum showed 1 band at 641 cm-1, while at 77 K 4 bands were observed at 607, 621, 634 and 643 cm-1. Crystal water is observed in the infrared spectrum by the OH-libration mode at 754 cm-1, OH-bending mode at 1631 cm-1, OH-stretching modes at 3248 (symmetric) and 3377 cm-1 (antisymmetric) plus a combination band at 3510 cm-1 of the H-bonded OH-mode plus the OH-stretching mode. The near-infrared spectrum gave information about the crystal water resulting in overtone and combination bands of OH-libration, OH-bending and OH–stretching modes

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ID Code: 928
Item Type: Journal Article
Refereed: Yes
Keywords: infrared spectroscopy, manure, near, infrared spectroscopy, Raman spectroscopy, sulphate, syngenite
DOI: 10.1016/S0924-2031(01)00139-4
ISSN: 0924-2031
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 2002 Elsevier
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher: This journal is available online.
Deposited On: 13 Oct 2005 00:00
Last Modified: 09 Jun 2010 12:23

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