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Raman spectroscopic study of the sulfite‐bearing minerals scotlandite, hannebachite and orschallite: implications for the desulfation of soils
Author(s) -
Frost Ray L.,
Keeffe Eloise C.
Publication year - 2009
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.2089
Subject(s) - raman spectroscopy , sulfite , chemistry , sulfur , mineral , sulfate , analytical chemistry (journal) , inorganic chemistry , organic chemistry , optics , physics
The structures of the naturally occurring sulfite‐bearing minerals scotlandite, hannebachite and orschallite have been studied by Raman spectroscopy. Raman bands are observed for scotlandite PbSO 3 at 935, 880, 622 and 474 cm −1 and are assigned to the (SO 3 ) 2− ν 1 ( A 1 ), ν 3 ( E ), ν 2 ( A 1 ) and ν 4 ( E ) vibrational modes, respectively. For hannebachite (CaSO 3 ) 2 ·H 2 O these bands are observed at 1005, 969 and 655 cm −1 with multiple bands for the ν 4 ( E ) mode at 444, 492 and 520 cm −1 . The Raman spectrum of hannebachite is very different from that of the compound CaSO 3 ·2H 2 O. It is proposed, on the basis of Raman spectroscopy, that in the mineral hannebachite, the sulfite anion bonds to Ca through the sulfur atom. The Raman spectrum of the mineral orschallite Ca 3 [SO 4 ](SO 3 ) 2 ·12H 2 O is complex resulting from the overlap of sulfate and sulfite bands. Raman bands at 1005 cm −1 , 1096 and 1215 cm −1 are assigned to the (SO 4 ) 2− ν 1 symmetric and ν 3 asymmetric stretching modes. The two Raman bands at 971 and 984 cm −1 are attributed to the (SO 3 ) 2− ν 3 ( E ) and ν 1 ( A 1 ) stretching vibrations. The formation of sulfite compounds in nature offers a potential mechanism for the removal of sulfates and sulfites from soils. Copyright © 2008 John Wiley & Sons, Ltd.