Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10560126 | Talanta | 2011 | 6 Pages |
Abstract
The nickel-aluminum layered double hydroxide (Ni-Al LDH) was synthesized by a simple co-precipitation method and used as a solid-phase extraction (SPE) sorbent for separation and pre-concentration of trace levels of salicylic acid (SA) from aqueous solutions. Extraction of analyte is based on the adsorption of salicylate ions on the Ni-Al (NO3â) LDH and/or their exchanging with LDH interlayer NO3â ions. The retained analyte on the LDH was stripped by 3 mol Lâ1 NaOH solution and its concentration was subsequently determined spectrofluorometrically at λem = 400 nm with excitation at λex = 270 nm. Various parameters affecting the extraction efficiency of SA on the Ni-Al (NO3â) LDH, such as pH, amount of nano-sorbent, sample loading flow rate, elution conditions, sample volume and matrix effects were investigated. In the optimum experimental conditions, the limit of detection (3 s) and enrichment factor were 0.12 μg Lâ1 and 40, respectively. The relative standard deviation (RSD) for six replicate determinations of 10 μg Lâ1 SA was 2.3%. The calibration graph using the pre-concentration system was linear in the range of 0.3-45 μg Lâ1 with a correlation coefficient of 0.9985. The optimized method was successfully applied to the determination of SA in blood serum, willow leaf and aspirin tablet.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
H. Abdolmohammad-Zadeh, S. Kohansal, G.H. Sadeghi,