T: TOXICOLOGY AND CHEMICAL FOOD SAFETY
Potential of Sawdust as a Green and Economical Sorbent for Simultaneous Preconcentration of Trace Amounts of Cadmium, Cobalt, and Lead from Water, Biological, Food, and Herbal Samples
Article first published online: 2 APR 2013
© 2013 Institute of Food Technologists®
Journal of Food Science
Volume 78, Issue 5, pages T797–T804, May 2013
How to Cite
Baki, M. H., Shemirani, F. and Khani, R. (2013), Potential of Sawdust as a Green and Economical Sorbent for Simultaneous Preconcentration of Trace Amounts of Cadmium, Cobalt, and Lead from Water, Biological, Food, and Herbal Samples. Journal of Food Science, 78: T797–T804. doi: 10.1111/1750-3841.12104
- Issue published online: 6 MAY 2013
- Article first published online: 2 APR 2013
- Manuscript Accepted: 5 FEB 2013
- Manuscript Received: 15 OCT 2012
- flame atomic absorption spectrometry;
Application of treated sawdust with NaOH as a green and economical sorbent for simultaneous preconcentration of trace amounts of Cd(II), Co(II), and Pb(II) ions from liver, lettuce, fish, and water as test samples with complicated matrices was investigated. Various parameters, such as effect of pH and contact time, breakthrough volume, type, and concentration of eluent and interference of ions were studied. The sorption was quantitative in the pH of 5.0 to 7.0 and desorption occurred instantaneously with 5.0 mL of mixed solutions of ethanol and 2.0 mol/L HNO3–HCl and the amount of ions was measured by using flame atomic absorption spectrometry. Linearity was maintained at 3 to 500 μg/L for cobalt, 5.0 to 800 μg/L for lead, and 2.0 to 300 μg/L for cadmium in the original solution. The relative standard deviation was less than 1.80% (n = 6, with concentration of 0.3 mg/L for cadmium and 0.5 mg/L for lead and cobalt). Detection limits and maximum capacity of the sorbent for Co (II), Cd (II), and Pb (II) in the original solution were 0.86, 0.50, and 1.7 μg/L and 28.5, 30.6, and 47.3 mg/g, respectively. The results for spiked real samples, effect of interfering ions, and adsorption capacity indicated that the applicability of this method for lead preconcentration is better than cadmium and cobalt preconcentration from complicated matrices.
Practical Application: Sawdust can be applied as a green and economical sorbent for simultaneous preconcentration and solid-phase extraction of metal ions from food and environmental samples with complicated matrices.