On-line preconcentration system using a microcolumn packed with Alizarin Red S-modified alumina for zinc determination by flame atomic absorption spectrometry
AUTOR(ES)
Shabani, A.M. Haji, Dadfarnia, S., Moosavinejad, T., Ahmadi, Seyyed Hamid
FONTE
Química Nova
DATA DE PUBLICAÇÃO
2009
RESUMO
A simple and sensitive on-line flow injection system for determination of zinc with FAAS has been described. The method is based on the separation and preconcentration of zinc on a microcolumn of immobilized Alizarin Red S on alumina. The adsorbed analyte is then eluted with 250 µL of nitric acid (1 mol L-1) and is transported to flame atomic absorption spectrometer for quantification. The effect of pH, sample and eluent flow rates and presence of various cations and anions on the retention of zinc was investigated. The sorption of zinc was quantitative in the pH range of 5.5-8.5. For a sample volume of 25 mL an enrichment factor of 144 and a detection limit (3S) of 0.2 µg L-1 was obtained. The precision (RSD, n=7) was 3.0% at the 20 µg L-1 level. The developed system was successfully applied to the determination of zinc in water samples, hair, urine and saliva.
Documentos Relacionados
- Immobilized stearic acid as a new sorbent for on-line preconcentration and determination of lead by flow injection flame atomic absorption spectrometry
- Solid sampling analysis by flame atomic absorption spectrometry for lead determination in seawater samples after pre-concentration using cocrystallized alizarin red - naphthalene
- Determination of cadmium by flame-atomic absorption spectrometry after preconcentration on silica gel modified with cupferron
- On-line preconcentration employing a tannin resin for copper determination in plant material and food stuff by atomic absorption spectrometry
- Preconcentration procedure using vortex agitator system for determination of trace levels of cadmium by flame atomic absorption spectrometry