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.
In modern age pesticide is used widely in agriculture. Lambda-cyhalothrin (LCT) is one of the most used pesticides which are used as a insecticide to kill pest, tricks, flies etc in agricultural field and it is also used for crop production. We have developed new method to detect LCT insecticide in agriculture field and reduce its uses. In this method we found the maximum absorbance at 460 nm for yellow colour dye. We also calculated limit of detection and limit of quantification 0.001 mg kg-1 and 0.056 mg kg-1 respectively. Molar absorptivity and Sandell’s sensitivity was also calculated and obtained 1.782 ×107 mol-1 cm-1 and 9.996 ×10-6 µg cm-2 respectively. The obtained yellow colour dye obeyed Beer’s law limit range of 0.5 µg ml -1 to 16 µg ml-1 in 25 ml. This method is less time consuming, selective, simple, sensitive and low cost. Present method is successfully applied in various soil, water and vegetable samples.
Pesticides are designated mixture of substances for extenuating and destroying any group of pests such as insects and vegetation. Pymetrozine [6-methyl-4-[(E)-pyridin-3-ylmethylideneamino]-2, 5-dihydro-1, 2, 4-triazin-3-one] is a pyridine azomethine compound which represents a class of insecticide. A Spectrophotometric method has been developed on the modified Fujiwara reaction for the determination of pymetrozine. Pymetrozine directly reacts with chloroform the 45-500C turns out the violet color in the formation of Schiff’s Base (Glutaconic Aldehyde). In the present reaction, the violet color obtained is discharged with a few drops of acetic acid followed by the addition of p- nitro aniline reagent which gives yellow color dyes. The absorption maxima of yellow-colored dye measured at 430 nm. Beer’s law is obeyed over the range of 1 to 10 µg per 10 ml of pymetrozine. The molar absorptivity of the colored system is 1.38×105 L mol-1 and Sandall’s sensitivity is 1.0×10-3µg cm-2. This method is free from the interference of other interfering and can be successfully applied for the determination of various ecological samples.
A large variety of pesticides have been used in the agriculturearea to raise the quality, extend and yield storage life of crops.However, the use of pesticides has been greater than before now a day dueto the growing rapid urbanization and population. The nonstop uses ofthese pesticides have resulted in pollution of the environment and alsocaused risk to human health. For the rapid detection of selective phenthoate pesticides, we developed a simple and highly sensitive spectrophotometric method based on azo-coupling reaction. After a simple pretreatment of phenthoatewith a diazotized solution,the resulting is rapidly undergoing azo-coupling reaction with 4-aminoazobenzene with adramatic color change only in few minutes.Finally, we successfully applied the concentration of phenthoate pesticides on vegetable, fruit, water, and soil samples. In this method, we found the absorption maxima of the orange dye compound was measuredat480nm.ThecolorsystemobeysBeer’slawinthefollowingworkingrangeof5µg to 40 µg in a final solution of 25 mL. The molar absorptivity, Sandell’s sensitivity, standard deviation, and the relative standard deviation was found to be 1.083X107L mol-1 cm-1, 0.99X10-5µg cm-2, ±0.003 and 0.89% respectively. This method is simple, sensitive, andfree from interferences of other pesticides and diverse ions. Other pesticides do not interfere with the proposed method. The method is highly reproducible and has been successfully applied for the determination of phenthoate insecticides in vegetables and fruit samples.
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