Analytical application of pyridine type ionic liquid as solid solvent. (May 2015)

• Record Type: Journal Article
• Authors: Pan, Z. W.; Zeng, H.; Yang, H. C.; Yu, M. L.; Wang, Z. Y.; Wu, W. J.; Huang, X. Q.
• Is Part Of: Materials research innovations. Volume 19:Number 5(2015)
• Page Start: S5-283
• Page End: S5-287
• Publication Date: 2015-05
• Subjects: Materials -- Research -- Periodicals; Matériaux -- Recherche -- Périodiques; 620.1105
• DOI: 10.1179/1432891714Z.0000000001093
• Languages: German
• ISSNs: 1432-8917

Abstract

<abstract> <title> <x content-type="archive" xml:space="preserve">Abstract</x> </title> <p>Copper (Cu²⁺) ion was determined at micro level by diethyldithiocarbamate (DDTC) spectrophotometry after temperature-dependent solid–liquid separation using <italic>N</italic>-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)<italic>_m</italic>Cl₂ (<italic>m</italic> = 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 <italic>Y</italic> = 0·00328 + 0·10279<italic>X</italic> (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 (<italic>n</italic> = 5) of 2·82% and recoveries in the range of 96·6–108·5%.</p> </abstract>