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- Title
Vortex-assisted liquid–liquid microextraction of strontium from water samples using 4′,4″(5″)-di-(tert-butylcyclohexano)-18-crown-6 and tetraphenylborate.
- Authors
Wang, Chin‐Yi; Chang, Da‐An; Shen, Yuzhou; Sun, Yuh‐Chang; Wu, Chien‐Hou
- Abstract
A vortex-assisted liquid–liquid microextraction method was developed for the chromatographic determination of strontium in aqueous samples. In the method, strontium was complexed with 4′,4″(5″)-di-(tert-butylcyclohexano)-18-crown-6 in the presence of tetraphenylborate as the counter anion, which increased the hydrophobicity of the ion-association complex, resulting in its improved extraction into 1-octanol. Strontium from the organic phase was stripped with nitric acid back to aqueous solution and determined by ion chromatography. The optimum microextraction conditions were as follows: 2.0 mL aqueous samples with 3 mM tetraphenylborate;; 150 μL of 1-octanol as the extractant phase with 10 mM DtBuCH18C6; vortex extraction time for 10 s; centrifugation at 6000 rpm for 4 min; stripping by 0.1 M nitric acid. Under the optimum conditions, the detection limit for strontium was 0.005 mg/L. The calibration curves showed good linearity over the range between 0.01 and 2.5 mg/L. Intra- and interday precisions of the present method were satisfactory with relative standard deviations of 1.7 and 2.1%, respectively.
- Subjects
STRONTIUM; TETRAPHENYLBORATES; HYDROPHOBIC interactions; NITRIC acid; STANDARD deviations
- Publication
Journal of Separation Science, 2017, Vol 40, Issue 19, p3866
- ISSN
1615-9306
- Publication type
Article
- DOI
10.1002/jssc.201700205