Residue Dissipation Patterns of Neonicotinoid Acetamiprid and Thiamethoxam in Swiss Chard for the Harvest Periods under Greenhouse Conditions

et al. 2019

Molecules

The dissipation behaviors of acetamiprid and chlorantraniliprole in kimchi cabbages were studied under open-field conditions. A simple and rapid analytical method was developed using ultra-high performance liquid chromatography coupled with tandem mass spectrometry (UHPLC-MS/MS). The multiple reaction monitoring (MRM) conditions of two pesticides were optimized to quantify and identify the pesticide residues. Sample preparation was performed by the QuEChERS (quick, easy, cheap, effective, rugged, and safe) method. Average recovery rates at the different spiked levels (0.05 and 0.25 mg/kg) were in the range of 103.6–113.9% (acetamiprid) and 80.8–91.2% (chlorantraniliprole), and the relative standard deviations were ≤4.3% for all. The dissipation kinetics were assessed using first-order equations after spraying acetamiprid and chlorantraniliprole individually on kimchi cabbages. The biological half-lives in field 1 and 2 were 5.2 and 6.3 days (acetamiprid) and 10.0 and 15.2 days (chlorantraniliprole), respectively. Based on the dissipation equations, the pre-harvest residue limits (PHRLs) corresponding to each day before harvest were suggested as the guidelines to meet the MRL on harvest day. It was also predicted that the terminal residues observed after multiple sprayings (three and seven days) would be below the MRL when harvested, in compliance with the established pre-harvest intervals.

Section: Introductionmentioning

confidence: 99%

Dissipation Kinetics and the Pre-Harvest Residue Limits of Acetamiprid and Chlorantraniliprole in Kimchi Cabbage Using Ultra-Performance Liquid Chromatography-Tandem Mass Spectrometry

Lee

et al. 2019

Molecules

“…Pesticide residues may remain on crops; however, pesticide retention poses potential risks to human health and the environment 3 , 4 . A positive list system has been in place in the Republic of Korea (ROK) since 2019 5 , which regulates the limits for pesticides (0.01 mg/kg) applied to agricultural products for which there is no maximum residue limit (MRL). Although agricultural products must be safer for consumers 6 , maintaining these strict standards is challenging for producers.…”

Section: Introductionmentioning

confidence: 99%

Dissipation behavior and dietary exposure risk of pesticides in Brussels sprout evaluated using LC–MS/MS

et al. 2022

Sci Rep

In this study, the dissipation behavior and dietary exposure risk of eight pesticides in Brussels sprout were evaluated under greenhouse conditions. Brussels sprout samples were collected 0, 7, 14, and 21 days after the last pesticide treatment. Ultra-high performance liquid chromatography with tandem mass spectrometry was used for sample analysis. Recovery rates at different concentrations of pesticides (0.01 and 0.1 mg/kg) were in the range of 70.2–104.5%, and the relative standard deviations were ≤ 10.6%. The pesticide residues in Brussels sprouts were determined for each treatment. For acephate, etofenprox, imidacloprid, indoxacarb, alpha-cypermethrin, zeta-cypermethrin, fludioxonil, and oxytetracycline, the half-lives were, respectively, 11.3, 9.8, 11.3, 15.8, 10.6, 13, 9.1, and 8.2 d and the dietary intake rates were, respectively, 2.90%, 0.81%, 0.7%, 1.19%, 0.06%, 0.24%, 0.05%, and 0.36% of the acceptable daily intake. The findings of this study provide important insights into the establishment of maximum residue limits in the Republic of Korea and pesticide control measures for Brussels sprout.

“…Levels of residual pesticides in food are usually legislated to minimize unnecessary exposure of consumers (Na et al, 2012).In the Republic of Korea (ROK), a positive list system (PLS) was enforced since 2019 (Chang et al, 2018). PLS representsa legislative rule that the tolerance limit of a pesticide residue (0.01mg/kg) must be applied to agricultural products that have no maximum residue limit (MRL).Consequently, consumers intake agricultural products that are less exposed to pesticides (Yang et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Fungicide dissipation kinetics and dietary exposure risk assessment in squash fruit and leaf

An¹,

et al. 2022

Preprint

Dissipation behavior and dietary exposure risk assessment of four pesticides (dimethomorph, mandipropamid, myclobutanil, and metalaxyl) were studied in fruits and leaves of squash grown under greenhouse conditions. Squash fruit and leaf samples were collected randomly at 0, 3, 5, 7, and 14 days after the last pesticide application. The analytical method was set up using ultra-high performance liquid chromatography with tandem mass spectrometry (UHPLC-MS/MS). The quick, easy, cheap, effective, rugged, and safe method (QuEChERS) was performed for sample preparation. Recovery rates at two spiked levels (0.01 and 0.1 mg/kg) were in the range of 76.4–101.9% for the analyzed pesticides and their relative standard deviations were ≤ 4%.Pesticide half-lives were 2.1 and 4.9 days for dimethomorph, 4.6 and 8.1 days for mandipropamid, 4.7 and 8.2 days for myclobutanil, and 2.7 and 5 days for metalaxyl in squash fruit and leaf, respectively. Regarding total surveyors, hazard quotient values for squash fruit and leaf were ≤ 1.03 × 10− 3and ≤ 2.39 × 10− 3, respectively. These values in the case of true consumers were ≤ 3.14 × 10− 3and ≤ 3.91 × 10− 1, respectively.