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Mercury determination by FI-CV-AAS after the degradation of organomercurials with the aid of an ultrasonic field: the important role of the hypochlorite ion |
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| Authors: | Capelo J L Rivas G M Oliveira L G Vilhena C Santos A C Valada T Galesio M Oliveira P Silva M D R Gomes da Gaspar E M Alves S Fernandez C Vaz C |
| Affiliation: | a Requimte, Centro de Química Fina e Biotecnología, Departamento de Química, Faculdade de Ciências e Tecnología, Universidade Nova de Lisboa, Quinta da Torre, 2829 516 Monte de Caparica, Portugal b Instituto Superior Técnico de Lisboa, Avda Rovisco Pais, s/n, 1049 001 Lisboa, Portugal c Laboratório de Análises do IST, Instituto Superior Técnico, Av. Rovisco Pais, 1049 001 Lisboa, Portugal |
| Abstract: | Due to new findings, the methodology based on room-temperature ultrasonic irradiation (sonolysis) for conversion of organomercurials into inorganic mercury [J.L. Capelo, I. Lavilla, C. Bendicho, Anal. Chem. 72 (2000) 4979-4984.] is further investigated. Inorganic mercury is selectively determined by Flow Injection-Cold Vapour Atomic Absorption Spectrometry (FI-CV-AAS) using SnCl2/HCl. Complete oxidation of methyl-mercury can be accomplished within 90 s whilst phenyl and diphenyl-mercury can be degraded within 10 s using a 50% sonication amplitude (100 W nominal power) provided by a probe ultrasonic device (20.5 kHz frequency) and a 1 mol L−1 HCl liquid medium with the presence of hypoclorite ion. The importance of hypochlorite in reduction of organomercurials by stannous chloride is highlighted. Oxidation kinetics indicated a pseudo first-order reaction for methyl-mercury, phenyl-mercury, and dipheny-mercury. |
| Keywords: | Organomercurials Focused Ultrasound Degradation Hg FI-CV-AAS |
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