Volume 14, Issue 3 (2012)                   JAST 2012, 14(3): 557-564 | Back to browse issues page

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Hassanzadeh N, Esmaili Sari A, Bahramifar N. Dissipation of Imidacloprid in Greenhouse Cucumbers at Single and Double Dosages Spraying. JAST 2012; 14 (3) :557-564
URL: http://jast.modares.ac.ir/article-23-10441-en.html
Dissipation of Imidacloprid in Greenhouse Cucumbers at Single and Double Dosages Spraying
N. Hassanzadeh * 1, A. Esmaili Sari1 , N. Bahramifar1
1- Department of Environmental Science, Faculty of Natural Resources, Tarbiat Modares University, Noor, Islamic Republic of Iran.
Abstract:   (6766 Views)
In this study, residues of imidacloprid (Confidor) were measured in greenhouse cucumbers in Mazandaran Province, Iran. Confidor 200 SL was applied at the recommended rate (30.0 g ai ha-1) and its double (60.0 g ai ha-1). Samples were collected at 1 h to 21 days after application and analyzed to determine the content and dissipation rate of Imidacloprid. . Analysis was carried out by the QuEChERS method using HPLC-UV. The average initial deposits of imidacloprid on the cucumber fruits were found to be 1.93 and 3.65 mg kg-1 at the single and double dosages, respectively. Results showed that Imidacloprid was rapidly dissipated in cucumbers following a first order reaction kinetics at both application rates. The amount of dissipation in 21 days was 94.48% and 99.18% for, respectively, the single and double dosages. Residues of imidacloprid dissipated below the maximum residue limit (MRL) of 1 mg kg_1 in 3 days. Half-life (T1/2) for degradation of imidacloprid in cucumber was observed to be 3.40 and 2.70 days at the single and double dosages, respectively. A waiting period of 3 days is suggested for safe consumption of cucumber. Also, results showed that the dissipation was dependent on the initial application dose and followed a first order rate kinetics.
Keywords: Cucumber, Imidacloprid residue, Pre-harvest interval (PHI), QuECHERS method
Full-Text [PDF 138 kb]   (7326 Downloads)    
Subject: Food Science and Technology
Received: 2010/09/26 | Accepted: 2011/05/23 | Published: 2012/02/5
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