Residue levels and dissipation behaviors of chlorpyrifos in black pepper berries and soil
Journal Title: Food Research - Year 2018, Vol 2, Issue 6
Abstract
Residue trials of chlorpyrifos in black pepper were conducted to estimate the pre-harvest interval and maximum residue limit for one fruiting cycles. The experimental trials were conducted at five commercial grower’s plot located at Serian, Padawan, Sri Aman, Johor and Perak. Each farm was divided into 3 plots with each plot contained 30 mature vines. The first and second plots were treated with chlorpyrifos using manufacturer recommended rate and two-time maximum recommended rate respectively. The third plot was served as non-treated control plot. The insecticide was applied at monthly interval throughout the production cycle using a motorized sprayer with 8 applications. Pepper berries were randomly collected from each plot at 2 hrs, 1, 3, 5, 7, 9, 12 and 15 days after the last spray. The extraction was carried out using the QuEChERS method and was validated prior to actual analysis. Determination of the chlorpyrifos was carried out by gas chromatography-mass spectrometry. Satisfactory recoveries ranging between 80-120% indicated that the method developed was valid for subsequent analysis. The limits of quantification for chlorpyrifos were 0.01 mg kg−1, respectively. Results showed that chlorpyrifos residues were at the low level with the residue value ranging between <10 μg/kg to 392.07 μg/kg. Dissipation of chlorpyrifos in black pepper berries followed first-order kinetics, and the mean half-lives were 1.41 days after the last treatment. The results also indicated that pepper berries could be safely consumed after 13 days of application. The determined value of the proposed MRL for chlorpyrifos was 0.5 mg/kg.
Authors and Affiliations
C. A. Yap, Z. Jarroop
Keywords
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- EP ID EP489602
- DOI 10.26656/fr.2017.2(6).127
- Views 220
- Downloads 0
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