Preparation and Application of Polyimide Coated Stir Bar for Extraction of Phenols in Environmental Water Samples
10.11895/j.issn.0253-3820.150951
- VernacularTitle:聚酰亚胺固相萃取搅拌棒的制备及其在环境水中酚类的分析应用
- Author:
Shenghong LI
;
Dapeng WU
;
Yafeng GUAN
- Publication Type:Journal Article
- Keywords:
Polyimide;
Stir bar;
Solid phase extraction;
Thermal desorption;
Phenols
- From:
Chinese Journal of Analytical Chemistry
2016;44(6):842-849
- CountryChina
- Language:Chinese
-
Abstract:
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℃.
