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Issue 2, 2008
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Physical and chemical characteristics of particles produced by laser ablation of biogenic calcium carbonate

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Abstract

LA-ICP-MS analysis of the chemical composition of biogenic carbonate has many applications in the environmental sciences but the characteristics of the material produced by the ablation process are largely unknown. To fill this gap, we have undertaken a study of the chemical and physical nature of particles produced by laser ablation of biogenic carbonates. SEM imaging suggests that laser ablation produces two distinct particle populations, one consisting of microsize particles and the other of nanosize particles. A 213 nm laser gives rise to a higher proportion of microsize particles than a 193 nm laser, probably because the 213 nm laser couples less completely with carbonate material. The microsize particles appear to form by photomechanical fracturing along lines of cleavage or weakness, rather than by hydrodynamic sputtering (as is generally observed for silicates). Chemical analysis of the carbonate particles suggests that little chemical fractionation of biogenic carbonates occurs during the ablation process or during transport to the plasma. This is supported by the constancy of the fractionation factor ([X/Ca]measured/[X/Ca]true) during the course of an ablation of a carbonate standard. In contrast, changes in the fractionation factor during the first few seconds of ablation of the NIST 612 are observed for some elements. This difference in fractionation is likely to result from the different formation mechanisms of the microsize particles.

Graphical abstract: Physical and chemical characteristics of particles produced by laser ablation of biogenic calcium carbonate

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Publication details

The article was received on 09 May 2007, accepted on 18 Oct 2007 and first published on 31 Oct 2007


Article type: Technical Note
DOI: 10.1039/B706727E
J. Anal. At. Spectrom., 2008,23, 240-243

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    Physical and chemical characteristics of particles produced by laser ablation of biogenic calcium carbonate

    E. C. Hathorne, R. H. James, P. Savage and O. Alard, J. Anal. At. Spectrom., 2008, 23, 240
    DOI: 10.1039/B706727E

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