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

By J. Theo Kloprogge, Roelof D. Schuiling, Zhe Ding, Leisel Hickey, Huada D. Ruan, David Wharton and Ray L. Frost


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 mode

Topics: 030200 INORGANIC CHEMISTRY, infrared spectroscopy, manure, near, infrared spectroscopy, Raman spectroscopy, sulphate, syngenite
Publisher: Elsevier
Year: 2002
DOI identifier: 10.1016/S0924-2031(01)00139-4
OAI identifier: oai:eprints.qut.edu.au:928

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