Bibliographic Details
| Title: |
Silica-alumina-niobia (SiO2/Al2O3/Nb2O5) matrix obtained by the sol-gel processing method: new material for online extraction of zinc ions |
| Authors: |
Tarley, César Ricardo T., Ávila, Thiago C. de, Segatelli, Mariana G., Lima, Giovana de F., Peregrino, Gabrielly dos S., Scheeren, Carla W., Dias, Silvio Luís P., Ribeiro, Emerson S. |
| Source: |
Journal of the Brazilian Chemical Society. January 2010 21(6) |
| Publisher Information: |
Sociedade Brasileira de Química, 2010. |
| Publication Year: |
2010 |
| Subject Terms: |
adsorbent preconcentration system, zinc ions, silica-alumina-niobia, sol-gel process |
| More Details: |
In the present work, a new material, SiO2/Al2O3/Nb2O5 (designated as SiAlNb), was evaluated as an adsorbent in a flow 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 quantification 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 certified reference material (TORT-2 Lobster Hepatopancreas). |
| Document Type: |
article |
| File Description: |
text/html |
| Language: |
English |
| ISSN: |
0103-5053 |
| DOI: |
10.1590/S0103-50532010000600021 |
| Access URL: |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532010000600021 |
| Rights: |
info:eu-repo/semantics/openAccess |
| Accession Number: |
edssci.S0103.50532010000600021 |
| Database: |
SciELO |
