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Resumen: 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-per-particle 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.
Idioma: Inglés
DOI: 10.1007/s00216-016-9331-4
Año: 2016
Publicado en: Analytical and Bioanalytical Chemistry 408, 19 (2016), 5125–5135
ISSN: 1618-2642
Factor impacto JCR: 3.431 (2016)
Categ. JCR: CHEMISTRY, ANALYTICAL rank: 16 / 76 = 0.211 (2016) - Q1 - T1
Categ. JCR: BIOCHEMICAL RESEARCH METHODS rank: 26 / 77 = 0.338 (2016) - Q2 - T2
Factor impacto SCIMAGO: 0.99 - Analytical Chemistry (Q1) - Biochemistry (Q2)

Financiación: info:eu-repo/grantAgreement/ES/MINECO/CGL2010-17434
Financiación: info:eu-repo/grantAgreement/ES/MINECO/CTQ2012-38091-C02-01
Tipo y forma: Artículo (PostPrint)
Área (Departamento): Área Química Analítica (Dpto. Química Analítica)

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