Application ionic liquids on inorganic nanostructures for determination of pasticide in microextraction method

Layered double hydroxides are a class of anionic clays that have received many attentions due to their multifunctional properties in numerous fields as drug supports, catalysis application, adsorption and photocatalysts. The main goal of this study is the synthesis and application of nanostructured layered double hydroxides fibers as sorbent for extraction and determination of agriculture pesticides by the headspace solid phase microextraction method.

At first part of study, LDH/DABCO/PW fiber was synthesized. The prepared fiber was characterized by SEM, FT-IR and TGA. Then, applicability of fiber for extraction of agriculture pesticides in river water samples by the head space solid phase microextraction method was evaluated.

The results revealed that prepared fiber is appropriate for quantitative determination. Identification of desorbed analytes from the surface of fiber was performed in combination gas chromatography coupled with mass spectrometry. Under the optimized conditions, response was a linear function of concentration over the range0.001-100 µg L⁻¹.Correlation coefficients (R2) ranged from 0.965 to 0.999. And the limits of detection (LOD) were between 0.002-0.03 µgL⁻¹. The proposed fiber was successfully used for the determination of agriculture pesticides in spiked river water samples and RSD values were obtaine in the range of 4.9% - 11.1%.

The results showed that this proposed method has a good Dynamic Linear Range, repeatability and high sensitivity. It can also be used to extract other pesticides. Cheap and green, high sensitivity, no solvent use and low diagnostic limit are the unique advantages of the proposed method.