US EPA

2219817 

Journal Article 

Slow-Injection Ultrasound-Assisted Emulsification-Microextraction for Determination of Phthalate Esters in Water 

Li, S; Li, T; Gao, P; Lu, R; Zhou, W; Gao, H 

2014 

Yes 

Journal of Chromatographic Science
ISSN: 0021-9665 

Oxford University Press 

CARY 

52 

9 

1127-1134 

English 

24140802 

10.1093/chromsci/bmt154 

WOS:000348704400026 

https://search.proquest.com/docview/1635027361?accountid=171501
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A type of ultrasound-assisted emulsification-microextraction (USAEME) was applied for the extraction and determination of four phthalate esters (e.g., dimethyl phthalate, diethyl phthalate, dibutyl phthalate and benzyl butyl phthalate) in aqueous samples prior to quantification using HPLC-UV. The simultaneous injection of the extraction solvent and ultrasonication of the mixture results in an efficient extraction with the extractant well-dispersed in the sample. The parameters affecting the experimental results were analyzed and optimized through the design of the experiment. Using a central composite face-centered design, the results of 28 experimental data points were analyzed and validated. An optimal set of operating conditions was obtained using 40 μL of 1,1,2,2-tetrachloroethane and 1% NaCl subjected to 2.0 min of ultrasonication under natural pH. Under optimized conditions, the extractions resulted in analyte recoveries of 75-87% and high enrichment factors of 356-415. The calibration curves were linear, and the correlation coefficients ranged from 0.9992 to 0.9997 at concentrations of 5 to 300 μg L(-1). The RSDs (n = 5) were 5.6-7.9%. The limits of detection for the four phthalate esters ranged from 0.26 to 1.46 μg L(-1). 

Aqualine Abstracts; Water Resources Abstracts; ASFA 3: Aquatic Pollution & Environmental Quality; Enrichment; Solvents; Injection; Calibrations; Experimental Data; Phthalate esters; Correlation Coefficient; Hydrogen Ion Concentration