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  Global Journal of Analytical Chemistry. Volume 2, Issue 5 (2011) pp. 224-231
  Research Article
Optimization of dispersive liquid–liquid microextraction of pyrethroid insecticides from aqueous samples for determination by reversed-phase high performance liquid chromatography
  Saeed S. Albaseera, R. Nageswara raob,*, Y.V. Swamyc, K. Mukkantia  
a Centre for Chemical Sciences and Technology, Institute of Science and Technology, JNT University, Kukatpally, Hyderabad 500085, India
b HPLC group, Analytical Chemistry Division, Indian Institute of Chemical Technology, Tarnaka, Hyderabad 500007, India
c Bioengineering and Environmental Centre, Indian Institute of Chemical Technology, Tarnaka, Hyderabad 500007, India

  Dispersive liquid–liquid microextraction (DLLME) followed by high performance liquid chromatography with photo diode array detector (HPLC-PDA) has been evaluated for determination of three synthetic pyrethroids (SPs) in water. Adsorption of pyrethroid insecticides onto tube walls was one of its shortcomings. The effect of analyte adsorption was evaluated and a procedure to reduce pyrethroids loss onto tube walls was proposed. The effects of various variables on the extraction efficiency were evaluated and optimized. Under the optimum extraction conditions, the linearity was in the range of 0.2–100 µgL-1. Correlation coefficients varied from 0.9951 to 0.9992. Enrichment factors (EFs) ranged from 109 to 135. The recoveries of the investigated SPs range from 82.5% to 98.1% with RSD% values ranged from 5.6% to 10.8%. The limits of detection of the three pesticides ranged from 0.01 to 0.02 ng mL-1.
  Dispersive liquid-liquid microextraction; Synthetic pyrethroids; Pesticides; Water analysis; Pyrethroids adsorption  

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