Spectrophotometric Determination of Fenpropathrin in its Formulations and Water Samples

Abstract

Novel spectrophotometric methods were developed for the determination of fenpropathrin in insecticidal formulations and water samples. The methods were based on the hydrolysis of fenpropathrin with ethanolic KOH to form 3-phenoxy benzaldehyde. The resultant aldehyde group was condensed with anthranilic acid in presence of basic medium to form yellowish red color product having λ max of 485 nm or condensed with 2-chloro phenyl hydrazine to form pink color product having λ max of 557 nm. The color derivatives were correspondingly stable for 5 and 8 days. The Beer's law was obeyed over the range from 0.03-10.0 µg mL -1 and molar absorptivity 2.586 x 10 4 l mol -1 cm -1 for anthranilic acid and from 0.02-8.0 µg mL -1 and molar absorptivity 3.924 x 10 4 l mol -1 cm -1 for 2-chloro phenyl hydrazine were observed. The optimum reaction conditions and other analytical parameters were established. The proposed methods have been applied for the analysis of water samples.

An overview of sample preparation and extraction of synthetic pyrethroids from water, sediment and soil

“…Solvent selection for the extraction of environmental samples has been described [67]. A single solvent or a mixture of two solvents have been tested for extraction of pyrethroids from environmental samples [68][69][70][71][72][73]. Most commonly used solvents were dichloromethane (DCM), n-hexane, toluene, and ethyl acetate.…”

“…Soxhlet extraction and related techniques have been used as referee methods when conventional procedures based on other principles have to be evaluated [70,87]. These conventional methods have in common with soxhlet, the fact that they are time-consuming and require a large amount of solvents.…”

Quantification of Pyrethroid Residue in Food, Agricultural and Biological Samples

“…Absorption spectra: After alkaline hydrolysis cypermethrin and fenvalerate react with potassium iodide in acidic Effect of time and temperature: Hydrolysis of cypermethrin and fenvalerate to cyanide ion was studied at different temperatures. It was observed that the maximum hydrolysis was obtained with 20 % of sodium hydroxide at temperature range of 30-40 °C as it gave maximum absorbance values with good stability [23,25] (Fig. 3).…”

“…Determination of cypermethrine and fenvalerate in agricultural runoff water: Agricultural runoff water from river of Rajim Kumbh, Raipur district (Chhattisgarh) was collected in glass bottle (amber). Interferences of chloride ions and humic acid first suppressed by adding 1 mL of 0.1 M Na2S2O3 solution in 1 L of water sample [25]. After that this solution was filtered and an aliquots of water samples were taken in 25 mL calibrated tube and added sodium hydroxide and kept in hot water bath for completion of hydrolysis.…”