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Use este identificador para citar ou linkar para este item: https://repositorio.ufba.br/handle/ri/15706
Tipo: Artigo de Periódico
Título: Comparison of three different sample preparation procedures for the determination of traffic-related elements in airborne particulate matter collected on glass fiber filters
Título(s) alternativo(s): Talanta
Autor(es): Castilho, Ivan N. B.
Welz, Bernhard
Andrade, Jailson Bittencourt de
Smichowski, Patricia
Shaltout, Abdallah A.
Colares, Lígia
Carasek, Eduardo
Autor(es): Castilho, Ivan N. B.
Welz, Bernhard
Andrade, Jailson Bittencourt de
Smichowski, Patricia
Shaltout, Abdallah A.
Colares, Lígia
Carasek, Eduardo
Abstract: Three different procedures for sample preparation have been compared for the determination of Cu, Mo and Sb in airborne particulate matter (APM) collected on glass fiber filters using high-resolution continuum source graphite furnace atomic absorption spectrometry (HR-CS GF AAS). Direct solid sample analysis of the ground filters was compared with microwave-assisted acid leaching with aqua regia and ultrasound-assisted extraction also using aqua regia. The main absorption line at 324.754 nm or the secondary line at 216.509 nm was used for the determination of Cu, depending on the analyte content in the samples. The primary absorption line at 313.259 nm was used for Mo and the secondary line at 212.739 nm for Sb determination. The limits of detection (LOD, 3σ) found for the direct solid sampling method, based on ten atomizations of an unused filter were 15 μg g−1 for all three analytes, corresponding to 40 ng m−3 for a typical air volume of 1440 m3 collected over a period of 24 h. The LOD for the other two methods were less than a factor of two inferior, but the total time required for an analysis was significantly longer. The repeatability of the measurements was between 3 and 9% (n = 5), and the results obtained with the three methods did not show any significant difference. The ratio between the three analytes on the filters from areas of intense traffic was found to be around Cu:Mo:Sb ≈ 4:1:1.4, which suggests that the source of all three elements is brake linings, i.e., related to automobile traffic. When the ratio deviated significantly from the above values, the source of contamination was assumed to be of different origin.
Palavras-chave: High-resolution continuum source AAS
Traffic-related elements
Glass fiber filters
Direct solid sampling
Tipo de Acesso: Acesso Aberto
URI: http://repositorio.ufba.br/ri/handle/ri/15706
Data do documento: 2012
Aparece nas coleções:Artigo Publicado em Periódico (Química)

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