Risk assessment, dissipation behavior and persistence of quinalphos in/on green pea by gas chromatography with electron capture detector

Abstract

Chemical investigation was carried out to examine the risk assessment, dissipation behavior, persistence, and half-life period of quinalphos in/on green pea fruit by spraying quinalphos at fruiting stage followed by another application after 10-day interval. The samples were extracted by using the quick, easy, cheap, effective, rugged, and safe method, and the residues of quinalphos were analyzed by gas chromatography with electron capture detector. Herein, we report a novel, accurate, and cost-effective gas chromatography method for the determination of average deposits of quinalphos in/on green pea. The initial deposits and half-life of quinalphos were found to be 1.20 mg/kg and 2.77 days, respectively, following the application of insecticide. Residues of quinalphos reached below detection limit of 0.05 mg/kg after 10 days at recommended dosage. For risk assessment studies, the tenth day will be safe for consumers for consumption of green pea. The developed method is simple, selective, and repeatable, and it can be extended for quinalphos-based standardization of herbal formulations containing green pea and its use in pesticide industries.

Persistence, dissipation kinetics, and waiting period of ethion on cucumber by gas chromatography‐electron capture detector

“…Based on the results, the maximum concentration of ethion residues in cucumber samples was found two hour after pesticide application and its concentration decreased with increasing the storage time. This result is in accordance with other studies on the persistence of ethion residues and the same trend were found in quinalphos and ethion on green pea .…”

Dissipation, risk assessment, half‐life period and method validation of carbendazim and triazophos in green pea by high‐performance liquid chromatography

“…The degradation kinetics of carbendazim and triazophos residues in green pea was confirmed by comparing residue concentration against time, and the results are depicted in Table 2. The persistence of carbendazim and triazophos residues was expressed in terms of half-life (T 1/2 ) or DT 50 which is 1.27 and 1.82 days ( Table 2) by following first-order kinetics [16,25].…”

“…Therefore, RP‐HPLC appears the helpful approach of choice affording identification, separation and quantification of pesticides . In present communication with continuation of our previous studies on application of chromatography, risk assessment, persistence and simultaneous quantification of carbendazim and triazophos has been evaluated by validated reversed phase high performance liquid chromatography.…”

Method validation and simultaneous quantification of eight organochlorines/organophosphates in apple by gas chromatography

“…Therefore, gas chromatography (GC) appears the appropriate choice affording identification, separation and quantification of pesticides. In continuation of our previous studies [19][20][21][22][23][24][25][26][27][28] on application of chromatography for fingerprinting and chromatographic method development to assure quality control of vegetables/fruits/medicinal plants, a validated analytical method has been developed for the simultaneous quantification of eight pesticides ( Fig. 1) from apple: chlorpyrifos-methyl (1), chlorpyrifos (2), quinolphos (3), profenofos (4), myclobutnil (5), ethion (6), fenpropathrin (7) and cypermethrin (8).…”