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Citation: LI Sheng-Hong, WU Da-Peng, GUAN Ya-Feng. Preparation and Application of Polyimide Coated Stir Bar for Extraction of Phenols in Environmental Water Samples[J]. Chinese Journal of Analytical Chemistry, ;2016, 44(6): 842-849. doi: 10.11895/j.issn.0253-3820.150951 shu

Preparation and Application of Polyimide Coated Stir Bar for Extraction of Phenols in Environmental Water Samples

1.
Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;
2.
University of Chinese Academy of Sciences, Beijing 100039, China

Received Date: 1 December 2015
Revised Date: 7 January 2016

Fund Project: This work was supported by the National Natural Science Foundation of China (Nos.21275144, 21475131, 21321064)

Figures(4)

A polyimide coated stir bar for sorptive extraction (SBSE) was prepared by immersion precipitation method, and evaluated by using 5 phenols and chlorinated phenols as model samples. The extraction efficiency of the prepared stir bar was the highest compared with commercial extraction phases of SBSE. Experimental parameters including stir speed, ionic strength, extraction temperature, extraction time, desorption temperature and time were optimized. Under the optimal conditions such as 100 mL of sample, 30 g of NaCl, extraction time of 30 min, stirring speed of 800 r/min and at 25℃, the target compounds were recovered by thermal desorption at 300℃ for 4 min, more than two orders of magnitude of linearity was obtained (R≥0.9995), LOQs (S/N=10) were 0.028-0.123 μg/L, and RSDs were in the range of 1.6%-9.7%. The polyimide SBSE coupled with gas chromatography-mass spectrometry was applied to the extraction/enrichment and analysis of phenols in real samples, including tap water, sea water, and waste water. It was found that the polyimide SBSE showed high selectivity towards polar compounds and high thermostability up to 350℃.
- Polyimide,
- Stir bar,
- Solid phase extraction,
- Thermal desorption,
- Phenols
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