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Título

Combining single-particle inductively coupled plasma mass spectrometry and X-ray absorption spectroscopy to evaluate the release of colloidal arsenic from environmental samples

Autor Gómez-González, Miguel A.; Bolea, Eduardo; O'Day, Peggy; García-Guinea, Javier ; Garrido, Fernando ; Laborda, Francisco
Palabras clave Arsenic
Scorodite
Colloids
XAS
SP-ICP-MS
Single particle
Fecha de publicación jul-2016
EditorSpringer
Citación Analytical and Bioanalytical Chemistry 408(19): 5125-5135 (2016)
ResumenAbstract Detection and sizing of natural colloids involved in the release and transport of toxic metals and metalloids is essential to understand and model their environmental effects. Single-particle inductively coupled plasma mass spectrometry (SP-ICP-MS) was applied for the detection of arsenic-bearing particles released from mine wastes. Arsenic-bearing particles were detected in leachates from mine wastes, with a mass-perparticle detection limit of 0.64 ng of arsenic. Conversion of the mass-per-particle information provided by SP-ICP-MS into size information requires knowledge of the nature of the particles; therefore, synchrotron-based X-ray absorption spectroscopy (XAS) was used to identify scorodite (FeAsO4·2H2O) as the main species in the colloidal particles isolated by ultrafiltration. The size of the scorodite particles detected in the leachates was below 300¿350 nm, in good agreement with the values obtained by TEM. The size of the particles detected by SP-ICP-MS was determined as the average edge of scorodite crystals, which show a rhombic dipyramidal form, achieving a size detection limit of 117 nm. The combined use of SP-ICP-MS and XAS allowed detection, identification, and size determination of scorodite particles released from mine wastes, suggesting their potential to transport arsenic.
URI http://hdl.handle.net/10261/144301
Identificadoresdoi: 10.1007/s00216-016-9331-4
issn: 1618-2642
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