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|Type:||Artigo de periódico|
|Title:||Silica-alumina-niobia(sio2/al2o3/nb2o5) Matrix Obtained By The Sol-gel Processing Method: New Material For Online Extraction Of Zinc Ions|
De Avila T.C.
De F. Lima G.
Dos S. Peregrino G.
|Abstract:||In the present work, a new material, O2/Al2O 3/Nb2O5 (designated as SiAlNb), was evaluated as an adsorbent in a fow injection spectrophotometric method for online preconcentration and determination of trace amounts of Zn2+ ions. The preconcentration method is based on Zn2+ adsorption onto the surface of SiAlNb in alkaline medium (pH 9.0). The elution step is carried out using HNO3 solution, followed by reaction of the Zn2+ ions with 1-(2-piridylazo)-2-naphtol (pan) in ammoniacal buffer solution (pH 9.3) containing Tween-80. The [Zn(pan)2] complex formed is determined at 560 nm. The method presented a linear range between 7.6 and 180.0 μg L -1 (r = 0.9992) and limits of detection and quantifcation of 2.3 and 7.6 μg L-1, respectively. According to the Langmuir linear model, the maximum adsorption capacity was found to be 7.0 mg of Zn2+ g -1 of SiAlNb. The proposed method was successfully applied to the Zn2+ determination in water samples (lake, mineral, tap) and certifed reference material (TORT-2 Lobster Hepatopancreas). © 2010 Sociedade Brasileira de Química.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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