Residue levels of preharvest-sprayed amitraz in date fruits | ||
| Journal of Pest Control and Environmental Sciences | ||
| Volume 11, Issue 1, June 2003, Pages 1-12 PDF (263.9 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpces.2003.459386 | ||
| Authors | ||
| Suloiman Al-Rehiayani; Khaled A. Osman* | ||
| Plant Protection Dept., Faculty of Agriculture and Veterinary Medicine, King Saud University, Al-Qassim Branch. P.O Box 1482, Saudi Arabia | ||
| Abstract | ||
| The residue levels of pre-harvest-sprayed amitraz on date fruits has been investigated. Date palm tree, variety of Sukkari, was sprayed with amitraz 20 % EC at the rate of 200 ml / 100 L (49 g a.i. / 100 L). Amitraz residues in date fruits were determined at different time intervals using high performance liquid chromatography (HPLC) with UV detection at 313 mn. The method was based on the extraction with acetone followed by partitioning with a mixture of n-hexane: ethyl acetate (80 : 20, V / V). The results showed that, the dissipation of amitraz was found to follow the following equation: Y = 79.39 - 10.1 ILnX with correlation coefficient (r) more than 0.96. The initial deposit of amitraz on date fruits was 0.889 mg / kg, while it decreased to 0.304 mg / kg after eight weeks of spraying. The tin was 18.9 days. The limits of detection and quantification were 0.027 and 0.01 mg / kg, respectively. The analysis was done by using spiked date fruits at the levels of 0.50, 0.75, and 1.0 mg / kg. The corresponding recoveries were 88.10, 105.50 and 94.11 %, with relative standard deviations of 7.63, 8.68, and 14.79 %, respectively. | ||
| Keywords | ||
| Pesticide residues; Preharvest; Amitraz; Date fruits | ||
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