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TiO2 nanomaterials detection in calcium rich matrices by spICPMS. A matter of resolution and treatment.

Abstract

High Ca concentrations in complex matrices such as river waters often hamper detection of titanium nanomaterials (TiO2 NPs) by single particle inductively coupled plasma mass spectrometry (spICPMS), because of isobaric interferences of 48Ca on the most abundant Ti isotope (48Ti). Several approaches were used to reduce this interference while measuring TiO2 in solutions with different Ca concentrations up to 100 mg/L. ICP-MS/MS was used with ammonia as collision cell gas and high resolution (HR) ICP-MS was used at different resolution settings. These approaches were compared with measuring different Ti isotopes (47Ti, 49Ti). spICPMS data was then treated with a deconvolution method to filter out dissolved signals and identify the best approach to detect the lowest possible corresponding spherical size of TiO2 NP (Dmin). ICP-MS/MS allowed for an important decrease of the theoretical Dmin compared to standard quadrupole ICP-MS, down to 64 nm in ultrapure water, however sensitivity was reduced by the reaction gas and increasing Ca concentrations also increased the Dmin. The comparably higher sensitivity of HR-ICP-MS allowed for theoretically measuring Dmin of 10 nm in ultrapure water. Combined with the deconvolution analysis, the highest resolution mode in HR-ICP-MS leads to the lowest Dmin at high Ca concentrations, even though significant broadening of the measured mass distributions occurred for TiO2 NPs at Ca concentrations up to 100 mg/L.

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Publication details

The article was received on 14 Feb 2017, accepted on 16 May 2017 and first published on 19 May 2017


Article type: Paper
DOI: 10.1039/C7JA00060J
Citation: J. Anal. At. Spectrom., 2017, Accepted Manuscript
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    TiO2 nanomaterials detection in calcium rich matrices by spICPMS. A matter of resolution and treatment.

    M. Tharaud, A. Gondikas, M. Benedetti, F. von der Kammer, T. Hofmann and G. Cornelis, J. Anal. At. Spectrom., 2017, Accepted Manuscript , DOI: 10.1039/C7JA00060J

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