Extraction of arsenic(III) in aqueous two-phase systems : a new methodology for determination and speciation analysis of inorganic arsenic.

Registro completo de metadados
MetadadosDescriçãoIdioma
Autor(es): dc.creatorAssis, Roberta Condé de-
Autor(es): dc.creatorFaria, Betania Aparecida de Araujo-
Autor(es): dc.creatorCaldeira, Cláudia Lima-
Autor(es): dc.creatorMageste, Aparecida Barbosa-
Autor(es): dc.creatorLemos, Leandro Rodrigues de-
Autor(es): dc.creatorRodrigues, Guilherme Dias-
Data de aceite: dc.date.accessioned2025-08-21T15:10:53Z-
Data de disponibilização: dc.date.available2025-08-21T15:10:53Z-
Data de envio: dc.date.issued2020-06-04-
Data de envio: dc.date.issued2020-06-04-
Data de envio: dc.date.issued2019-
Fonte completa do material: dc.identifierhttp://www.repositorio.ufop.br/handle/123456789/12306-
Fonte completa do material: dc.identifierhttps://www.sciencedirect.com/science/article/pii/S0026265X18309251-
Fonte completa do material: dc.identifierhttps://doi.org/10.1016/j.microc.2019.03.058-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/1004635-
Descrição: dc.descriptionThis work utilizes the liquid–liquid extraction technique of aqueous two-phase systems (ATPS) formed by a polymer and electrolyte to develop a novel methodology for the extraction, determination, and speciation analysis of inorganic arsenic. To optimize the methodology, the following parameters were studied: pH of the system, nature of the ATPS-forming electrolyte and the polymer, tie-line length (TLL) of the system, type and concentration of extractants, and the mass ratio of the top and bottom phases. The highest extraction (%E = 98%) was obtained for an ATPS composed of L64 + Na2SO4 + H2O, at pH = 6.00, TLL = 33.55% w/w using the ammonium pyrrolidine dithiocarbamate (APDC) extractant in a molar ratio (APDC/As(III)) of 960, and with a mass ratio of 1/4. In these same conditions, As(V) was not extracted satisfactorily (%E = 18%) to ATPS top phase, with a separation factor equal to 530 after three extractions, showing the great potential of the system for the speciation analysis of inorganic arsenic. Moreover, the method was validated employing HG-ICP OES with a coefficient of determination of 0.9957 and limits of detection and quantification equal to 0.20 μg kg−1 and 0.66 μg kg−1, respectively, proving that the method is capable of detecting the low concentrations required by legislation. The relative standard deviation (RSD) values varied between 4.88 and 9.45%, and the RSD in inter-day precision was 11.07%, which are in accordance with the limits of the validation guide used by the National Institute of Metrology, Quality and Technology, COD-CGCRE-008. Furthermore, relative error rates ranged from −7.44 to 9.90% and recovery percentages were between 92.6 and 110% for the accuracy studies. This method was also applied in a spiked tap water sample, presenting a recovery value equal to 87.10%.-
Formato: dc.formatapplication/pdf-
Idioma: dc.languageen-
Direitos: dc.rightsrestrito-
Título: dc.titleExtraction of arsenic(III) in aqueous two-phase systems : a new methodology for determination and speciation analysis of inorganic arsenic.-
Aparece nas coleções:Repositório Institucional - UFOP

Não existem arquivos associados a este item.