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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, David Wharton and Ray L. Frost


Syngenite (KCa(SO)·HO), formed during treatment of manure with sulphuric acid, was studied by infrared, near-infrared (NIR) and Raman spectroscopy. C site symmetry was determined for the two sulphate groups in syngenite (P2/m), so all bands are both infrared and Raman active. The split ν (two Raman+two infrared bands) was observed at 981 and 1000cm. The split ν (four Raman+four infrared bands) was observed in the Raman spectrum at 424, 441, 471 and 491cm. In the infrared spectrum, only one band was observed at 439cm. From the split ν (six Raman+six infrared) bands three 298K Raman bands were observed at 1117, 1138 and 1166cm. Cooling to 77K resulted in four bands at 1119, 1136, 1144 and 1167cm. In the infrared spectrum, five bands were observed at 1110, 1125, 1136, 1148 and 1193cm. From the split ν (six infrared+six Raman bands) four bands were observed in the infrared spectrum at 604, 617, 644 and 657cm. The 298K Raman spectrum showed one band at 641cm, while at 77K four bands were observed at 607, 621, 634 and 643cm. Crystal water is observed in the infrared spectrum by the OH-liberation mode at 754cm, OH-bending mode at 1631cm, OH-stretching modes at 3248 (symmetric) and 3377cm (antisymmetric) and a combination band at 3510cm 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-liberation, OH-bending and OH-stretching modes

Topics: Infrared spectroscopy, Manure, Near-infrared spectroscopy, Raman spectroscopy, Sulphate, Syngenite, 1607 Spectroscopy
Publisher: 'Elsevier BV'
Year: 2002
DOI identifier: 10.1016/S0924-2031(01)00139-4
OAI identifier:
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