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Dispersive liquid-liquid microextraction combined with ultrahigh performance liquid chromatography/tandem mass spectrometry for determination of organophosphate esters in aqueous samples.

Luo H, Xian Y, Guo X, Luo D, Wu Y, Lu Y, Yang B - ScientificWorldJournal (2014)

Bottom Line: The feasibility of this method was demonstrated by identifying OPEs in aqueous samples that exhibited spiked recoveries, which ranged between 48.7% and 58.3% for triethyl phosphate (TEP) as well as between 85.9% and 113% for the other OPEs.Only 2 of the 12 selected samples were tested to be positive for OPEs, and the total concentrations of OPEs in them were 1.1 and 1.6 µg/L, respectively.This method was confirmed to be simple, fast, and accurate for identifying OPEs in aqueous samples.

View Article: PubMed Central - PubMed

Affiliation: Guangzhou Quality Supervision and Testing Institute, Guangzhou 510110, China.

ABSTRACT
A new technique was established to identify eight organophosphate esters (OPEs) in this work. It utilised dispersive liquid-liquid microextraction in combination with ultrahigh performance liquid chromatography/tandem mass spectrometry. The type and volume of extraction solvents, dispersion agent, and amount of NaCl were optimized. The target analytes were detected in the range of 1.0-200 µ g/L with correlation coefficients ranging from 0.9982 to 0.9998, and the detection limits of the analytes were ranged from 0.02 to 0.07 µg/L (S/N = 3). The feasibility of this method was demonstrated by identifying OPEs in aqueous samples that exhibited spiked recoveries, which ranged between 48.7% and 58.3% for triethyl phosphate (TEP) as well as between 85.9% and 113% for the other OPEs. The precision was ranged from 3.2% to 9.3% (n = 6), and the interprecision was ranged from 2.6% to 12.3% (n = 5). Only 2 of the 12 selected samples were tested to be positive for OPEs, and the total concentrations of OPEs in them were 1.1 and 1.6 µg/L, respectively. This method was confirmed to be simple, fast, and accurate for identifying OPEs in aqueous samples.

Show MeSH
Optimization of vortexing time.
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Related In: Results  -  Collection


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fig4: Optimization of vortexing time.

Mentions: High-speed vortexing was employed to ensure that the solvents form extremely small liquid drops, so that a sufficient contact area with the sample could be achieved. The recoveries of all the analytes indicated that extraction reached equilibrium in a short time (2 min), as shown in Figure 4.


Dispersive liquid-liquid microextraction combined with ultrahigh performance liquid chromatography/tandem mass spectrometry for determination of organophosphate esters in aqueous samples.

Luo H, Xian Y, Guo X, Luo D, Wu Y, Lu Y, Yang B - ScientificWorldJournal (2014)

Optimization of vortexing time.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3927578&req=5

fig4: Optimization of vortexing time.
Mentions: High-speed vortexing was employed to ensure that the solvents form extremely small liquid drops, so that a sufficient contact area with the sample could be achieved. The recoveries of all the analytes indicated that extraction reached equilibrium in a short time (2 min), as shown in Figure 4.

Bottom Line: The feasibility of this method was demonstrated by identifying OPEs in aqueous samples that exhibited spiked recoveries, which ranged between 48.7% and 58.3% for triethyl phosphate (TEP) as well as between 85.9% and 113% for the other OPEs.Only 2 of the 12 selected samples were tested to be positive for OPEs, and the total concentrations of OPEs in them were 1.1 and 1.6 µg/L, respectively.This method was confirmed to be simple, fast, and accurate for identifying OPEs in aqueous samples.

View Article: PubMed Central - PubMed

Affiliation: Guangzhou Quality Supervision and Testing Institute, Guangzhou 510110, China.

ABSTRACT
A new technique was established to identify eight organophosphate esters (OPEs) in this work. It utilised dispersive liquid-liquid microextraction in combination with ultrahigh performance liquid chromatography/tandem mass spectrometry. The type and volume of extraction solvents, dispersion agent, and amount of NaCl were optimized. The target analytes were detected in the range of 1.0-200 µ g/L with correlation coefficients ranging from 0.9982 to 0.9998, and the detection limits of the analytes were ranged from 0.02 to 0.07 µg/L (S/N = 3). The feasibility of this method was demonstrated by identifying OPEs in aqueous samples that exhibited spiked recoveries, which ranged between 48.7% and 58.3% for triethyl phosphate (TEP) as well as between 85.9% and 113% for the other OPEs. The precision was ranged from 3.2% to 9.3% (n = 6), and the interprecision was ranged from 2.6% to 12.3% (n = 5). Only 2 of the 12 selected samples were tested to be positive for OPEs, and the total concentrations of OPEs in them were 1.1 and 1.6 µg/L, respectively. This method was confirmed to be simple, fast, and accurate for identifying OPEs in aqueous samples.

Show MeSH