Raman spectroscopic study of the sulphite bearing minerals scotlandite, hannebachite and orschallite : implications for the desulphation of soils
Frost, Ray L. & Keeffe, Eloise C. (2009) Raman spectroscopic study of the sulphite bearing minerals scotlandite, hannebachite and orschallite : implications for the desulphation of soils. Journal of Raman Spectroscopy, 40(3), pp. 244-248.
The structure of the naturally occuring sulphite bearing minerals scotlandite, hannebachite and orschallite have been studied by Raman spectroscopy. Raman bands are observed for scotlandite PbSO3 at 935, 880, 622 and 474 cm-1 and are assigned to the (SO3)2- ν1(A1), ν3(E), ν2(A1) and ν4(E) vibrational modes. For hannebachite (CaSO3)2.H2O these bands are observed at 1005, 969, 655 cm-1 with multiple bands for the ν4(E) mode at 444, 492 and 520 cm-1. The Raman spectrum of hannebachite is very different from that of the compound CaSO3.2H2O. It is proposed, based upon Raman spectroscopy, that in the mineral hannebachite, the sulphite anion bonds to Ca through the sulphur. The Raman spectrum of the mineral orschallite Ca3SO42.12H2O is complex resulting from the overlap of sulphate and sulphite bands. Raman bands at 1005 cm-1 and 1096 and 1215 cm-1 are assigned to the (SO4)2- ν1 symmetric and ν3 antisymmetric stretching modes. The two Raman bands at 971 and 984 cm-1 are attributed to the (SO3)2- ν3(E) and ν1(A1) stretching vibrations. The formation of sulphite compounds in nature offers a potential mechanism for the removal of sulphates and sulphites from soils.
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