Abstract
The developed method is based on cold-induced aggregation microextraction of Se(IV) using the 1-butyl-3-methylimidazolium hexafluorophosphate ionic liquid as an extractant followed by spectrophotometry determination. The extraction of Se(IV) was performed in the presence of dithizone as the complexing agent. In this method, a very small amount of 1-butyl-3-methylimidazolium hexafluorophosphate was added to the sample solution containing Se-dithizone complex. Then, the solution was kept in a thermostated bath at 50 °C for 4 min. Subsequently, the solution was cooled in an ice bath and a cloudy solution was formed. After centrifuging, the extractant phase was analyzed using a spectrophotometric detection method. Some important parameters that might affect the extraction efficiency were optimized (HCl, 0.6 mol L−1; dithizone, 4.0 × 10−6 mol L−1; ionic liquid, 100 μL). Under the optimum conditions, good linear relationship, sensitivity, and reproducibility were obtained. The limit of detection (LOD) (3Sb/m) was 1.5 μg L−1, and the relative standard deviation (RSD) was 1.2 % for 30 μg L−1 of Se(IV). The linear range was obtained in the range of 5–60 μg L−1. It was satisfactory to analyze rice and various water samples.
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The author thanks the research council at the Payame Noor University for their financial support.
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Rahnama, R., Abed, Z. Application of cold-induced aggregation microextraction as a fast, simple, and organic solvent-free method for the separation and preconcentration of Se(IV) in rice and various water samples. Environ Monit Assess 186, 4209–4216 (2014). https://doi.org/10.1007/s10661-014-3691-z
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DOI: https://doi.org/10.1007/s10661-014-3691-z