Analytical Application of Pyridine Type Ionic Liquid as Solid Solvent
Copper (Cu2+) ion was determined at micro level by diethyldithiocarbamate (DDTC) spectrophotometry after temperature-dependent solid–liquid separation using N-butyl pyridinium hexafluorophosphate ([BPy]PF6) as a solid solvent and DDTC as an extractant. The results showed that ions can be extracted 100% by DDTC–[BPy]PF6 at pH = 10·20. The extracted species was neutral Cu(DDTC)mCl2 (m = 1) based on slope analysis in the Cu2+–[BPy]PF6–DDTC temperature-dependent solid–liquid separation system. The recovery of Cu2+ extracted into DDTC–[BPy]PF6 can be achieved using 2 mol L−1 HNO3 as stripping agents. Back extraction method was adopted for the detection and quantification of Cu2+ ions using the DDTC spectrometry. The calibration curve was Y = 0·00328 + 0·10279X (correlation coefficient = 0·99922), the linear calibration range was 7·68 × 10−2 0·768 μg mL−1 and the limit of detection was 1·28 × 10−2 μg mL−1 for Cu2+. In this method, the contents of Cu2+ in Tieguanyin tea were determined with relative standard deviations (n = 5) of 2·82% and recoveries in the range of 96·6–108·5%.
Postprint version. Published in Materials Research Innovations, Volume 19, Issue 5, 2015, pages 283-287.
© Materials Research Innovations, 2015, Taylor & Francis
Pan, Z.W., Zeng, H., Yang, H.C., Yu, M.L., Wang, Z.Y., Wu, W.J., Huang, X.Q. (2015). Analytical Application of Pyridine Type Ionic Liquid as Solid Solvent. Materials Research Innovations, 19(5), 283-287.