Assessment of airborne platinum contamination via ICP-mass spectrometric analysis of tree bark

R. Ma, I. Staton, C. W. McLeod, M. B. Gomez, M. M. Gomez, M. A. Palacios

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35 Citations (Scopus)

Abstract

Tree bark is used as a passive bio-monitor to assess the environmental impact by the use of automotive catalysts containing platinum-group elements. Pt in bark samples collected from UK, Spain, Japan and USA was determined by ICP-MS both conventionally after acid digestion and directly utilising laser ablation. An ultrasonic nebuliser equipped with a membrane desolvator was employed for digest analysis, to improve the sensitivity (limit of detection, 0.8 ng l-1) and to eliminate the potential spectral interference caused by hafnium oxide. Pt concentrations found in the remote sites were below 9 ng g-1. Similar concentrations were obtained for Spanish/UK cities with occasionally slightly elevated values. In contrast, the concentrations for bark samples in major Japanese/US cities ranged up to 38 ng g-1. The data are consistent with the usage of Pt-containing automotive catalysts in the respective sites. Spatial micro-analytical data, acquired on raw bark materials, indicate that Pt occurred in a highly dispersed particulate form and was not readily transformed/solubilised by actions of weathering. Association of Pt with Pd and/or Rh (no correlation with Pb was observed) suggests that the particles detected originated from automotive catalysts.

Original languageEnglish
Pages (from-to)1070-1075
Number of pages6
JournalJournal of Analytical Atomic Spectrometry
Volume16
Issue number9
DOIs
Publication statusPublished - 20 Aug 2001
Externally publishedYes

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