Estimation of Indoxacarb Residues by QuEChERS Technique and Its Degradation Pattern in Cabbage

Abstract

Indoxacarb residues were estimated by employing standardized QuEChERS technique in cabbage following three applications of Avant(R) 14.8 EC @ 52.2 and 104.4 g a.i. ha(-1). The average recoveries of indoxacarb on cabbage for fortification levels of 0.01, 0.05 and 0.1 mg kg(-1) were observed to be 83.93, 89.86 and 95.40%, respectively, with relative standard deviation of 1.21, 1.53 and 2.23. The method was also validated with respect to parameters of linearity, precision and limit of quantification (LOQ). The LOQ for cabbage was found to be 0.01 mg kg(-1). The average initial deposits of indoxacarb on cabbage were observed to be 0.18 and 0.39 mg kg(-1), respectively, at single and double the application rate. These indoxacarb residues dissipated below its LOQ of 0.01 mg kg(-1)after 7 and 10 days, respectively, at single and double dosages. Half-life of indoxacarb was observed to be 2.88 and 1.92 days, respectively, at recommended and double the recommended dosages.

QuEChERS and soil analysis. An Overview.

“…The use of only NaCl for the extraction has been applied for indoxacarb [43] and procymidone [48] analysis. On the other hand, Mei et al [28] used only MgSO 4 for the extraction of five herbicides with small sample weight (1 g) and, thereafter, the method was then scaled, requiring only 0.1 g of MgSO 4 .…”

“…Finally, the sorbent is separated by centrifugation, and an aliquot of the final extract is taken for analysis [1,3,12,16,24,[26][27][28][29][30][31][32][33][34]36,[40][41][42][43][44][45][46][47][48].…”

“…Pollutants extracted from soils by QuEChERS have been analysed by GC with nitrogen-phosphorus detection (NPD) [24], ECD [1,43,45,47], 63 Ni μECD [11], and MS [36]. The detector volume of μECD is 10 times smaller than any other ECD, which translates into improved sensitivity and decreases the chance and 19 and 27% for bromoform than for water samples.…”

Residue patterns of indoxacarb and pyridalyl in treated cauliflower

“…Indoxacarb, methyl (S)-N-[7-chloro-2,3,4a,5-tetrahydro4a-methoxycarbonyl)indeno [1,2-e] [1,3,4]oxadiazin-2-ylcarbonyl]-4'-(trifluoromethoxy)carbanilate (Figure 1(a)), is an indeno-oxadiazine insecticide that is a broad spectrum, highly effective, nonsystemic, and synthetic organophosphate replacement insecticide. It is typically used on vegetables, tree fruit, vines, cotton, corn, and other crops to control lepidopteran pests and selected insect pests with sucking mouthparts [3].…”

“…It is typically used on vegetables, tree fruit, vines, cotton, corn, and other crops to control lepidopteran pests and selected insect pests with sucking mouthparts [3]. A key feature of this compound is its novel bioactivation, which blocks off the insects' voltage-gated metabolites.…”