Journal
CHROMATOGRAPHIA
Volume 70, Issue 11-12, Pages 1697-1701Publisher
SPRINGER HEIDELBERG
DOI: 10.1365/s10337-009-1356-9
Keywords
Dispersive liquid-liquid microextraction; Liquid chromatography-fluorescence detection; Organophosphate and carbamate in soil
Ask authors/readers for more resources
In the present work, a simple, rapid and sensitive sample pre-treatment technique, dispersive liquid-liquid microextraction (DLLME) coupled with liquid chromatography-fluorescence detection (LC-FLD), has been developed to determine carbamate (carbaryl) and organophosphorus (triazophos) pesticide residues in soil samples. Methanol was first used as extraction solvent for the extraction of pesticides from the soil samples and then as dispersive solvent in the DLLME procedure. Under the optimum extraction conditions, the linearity was obtained in the concentration range of 0.1-1,000 ng g(-1) for carbaryl and 1-5,000 ng g(-1) for triazophos, respectively. Correlation coefficients varied from 0.9997 to 0.9999. The limits of detection (LODs), based on signal-to-noise ratio (S/N) of 3, ranged from 14 to 110 pg g(-1). The relative standard deviation (RSDs, for 20.0 ng g(-1) of each pesticide) varied from 1.96 to 4.24% (n = 6). The relative recoveries of two pesticides from soil A1, A2 and A3 at spiking levels of 10.0, 20.0 and 50.0 ng g(-1) were in the range of 88.2-108.8%, 80.8-110.7% and 81.0-111.1%, respectively. The results demonstrated that DLLME was a sensitive and accurate method to determine the target pesticides, at trace levels, in soils.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available