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Use este identificador para citar ou linkar para este item: https://repositorio.ufba.br/handle/ri/7154
Tipo: Artigo de Periódico
Título: Deleterious effect of ammonium extraction from soil assisted by ultrasound
Título(s) alternativo(s): Microchemical Journal
Autor(es): Castro, Jacira Teixeira
Korn, Mauro
Autor(es): Castro, Jacira Teixeira
Korn, Mauro
Abstract: Ultrasound has been used to assist extraction procedures from solid samples based on the decrease of gradient concentration in the vicinity of particulate matter and the microjet produced during cavitation. In the present work, the harmful effect yield by ultrasound-assisted ammonium extraction from soil samples was observed by comparing with an extraction process assisted by magnetic stirring. Three soil samples from agricultural areas of Bahia state in Brazil were submitted to both extraction processes and ammonium concentrations for conventional stirring procedure were 25% higher than those obtained by the ultrasound-assisted extraction. This same effect was also observed by irradiating ammonium solutions with low frequency ultrasonic waves. After 5 min of ultrasonic irradiation, more than 25% of the ammonium was lost probably as N2. Possible conversions of N–NH4+to hydrazine, hydroxylamine, nitrite and nitrate were evaluated. In addition, an increasing in nitrate concentration by irradiating solution with high saline concentration independent on the initial ammonium concentration was observed.
Palavras-chave: Ammonium determination
Ultrasonic irradiation
Ultrasound-assisted extraction
Editora / Evento / Instituição: Elsevier
URI: http://www.repositorio.ufba.br/ri/handle/ri/7154
Data do documento: 2004
Aparece nas coleções:Artigo Publicado em Periódico (Química)

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