Modern agriculture makes use of chemical pesticides to increase the crop productivity so as to meet
the daily needs of uncontrolled population growth. These increase the productivity neglecting the
fertility of soil and food quality, hence risking the health of human beings including animals.
Fenpyroximate is a kind of acaricide which attacks and kills mites and decreases the growth of larvae.
A method is established for the detection of fenpyroximate and stop excessive use of pesticide. After
performing several tests on various wavelengths, the λmax for the detection of fenpyroximate was 435
nm for azo dye. Limit of detection (LOD) and limit of quantification (LOQ) was found to be 0.687 μg
mL-1 and 2.083 μg mL-1, respectively. Furthermore, molar absorptivity, Sandell′s sensitivity were calculated
to be 2.3 × 10-7 mol-1 cm-1 and 1 × 10-5 μg cm-2, respectively. The azo dye follows Beer′s law in the
range 5 μg to 14 μg in 10 mL that can be easily detected by using spectrophotometric analysis. This
method is very sensitive, low cost and less time consuming. The present method is applied successfully
in various vegetables (i.e. apple, cucumber, potato, spinach, etc.) soil and water samples.
An organophosphorous insecticide monocrotophos is increasingly being utilized in agriculture to control insects on a broad range of crops. In this study a new reaction system using spectrophotometric method for quantitative determination of monocrotophos is proposed. The method is based on the bromination of monocrotophos to form dibromomonocrotophos which react with Potassium iodide-Potassium iodate mixture in the presence of leuco malachite green (LMG) to form a water soluble greenish blue colored complex. The change in absorbance as a criterion of the bromination reaction progress was followed spectrophotometrically. To obtain t he maximum sensitivity the effective reaction variables were optimized. The absorbance maximum was observed at 620 nm. Under optimized experimental conditions calibration graph was linear over the range of 10.0-60.0 µg. The molar absorptivity of the colored system is 3.66×104 L mol-1 cm-1 and sandell’s sensitivity is 0.25×10-2 µg cm-2. The calculated detection limit was 0.44 µg mL-1. The interfering effect of various species was also investigated. The present method was successfully applied to the analysis of monocrotophos in different environmental and water samples.
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