Vortex-assisted liquid-liquid microextraction of strontium from water samples using 4',4″(5″)-di-(tert-butylcyclohexano)-18-crown-6 and tetraphenylborate.
Chin-Yi WangDa-An ChangYuzhou ShenYuh-Chang SunChien-Hou WuPublished in: Journal of separation science (2017)
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.
Keyphrases
- ionic liquid
- high performance liquid chromatography
- solid phase extraction
- simultaneous determination
- liquid chromatography
- molecularly imprinted
- liquid chromatography tandem mass spectrometry
- aqueous solution
- gas chromatography
- mass spectrometry
- tandem mass spectrometry
- biofilm formation
- high speed
- label free
- quantum dots
- pseudomonas aeruginosa