New Progresses in Analytical Methods of in situ S Isotope Measurement
The new progresses in analytical methods of in situ S isotope measurement by using laser ablation multi-collector inductively coupled plasma mass spectrometry(LA-MC-ICP-MS)and secondary ion mass spectrometry(SIMS)have been reviewed in this paper.The review is focused on the key technical difficulties,correction schemes of mass spectrum interference,and mass fractionation effects in the two instruments.As it suggested,both LA-MC-ICP-MS and SIMS can accurately determine the δ34S of various minerals,such as pyrite,chalcopyrite,sphalerite,galenite,pyrrhotite,pentlandite,molybdenite etc.The analytical accuracy is comparable to the traditional bulk analysis.The analytical precision(reproducibility)is ranges of from 0.17‰ to 0.45‰.There are a large number of reference materials of S isotope analysis in sulfides.However,the main reference materials are pyrite,chalcopyrite,pyrrhotite,and sphalerite.Other sulfides also lack the reference materials for microanalysis.It is suggested that improving the hardwares or key equipments,resolving the isotope fractionation and the matrix effect,developing the new sulfide reference materials will be the major development directions for the in situ S isotopic measurement by LA-MC-ICP-MS and SIMS.
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