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Method Validation and Investigation of Paclobutrazol in Soil Using SPME-GC-MS Technique

Method Validation and Investigation of Paclobutrazol in Soil Using SPME-GC-MS Technique,Anuwat Jaradrattanapaiboon,Pittaya Sruamsiri,Kathrin Reintjes,

Method Validation and Investigation of Paclobutrazol in Soil Using SPME-GC-MS Technique  
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Solid-phase microextraction (SPME) is a solvent-free sample preparation technique. 85 µm polyacrylate fi ber was used to extract the analytes directly from aqueous samples, associating with the conventional extraction, and then thermal desorption was carried out in the hot injector of GC. The application of them to soil sample in paclobutrazol residue analysis was validated. This technique was coupled mainly with gas chromatography and mass spectrometry (GC-MS). The preparative soil procedures for extraction of paclobutrazol, extraction time and analysis were obtained. 67% of the recovery from spiked soil samples was an average. Limit of detection was found at the concentration of 0.01 mg/kg sample, an appropriate extraction time was at 30 min. However, the simple dilution of the extraction to avoid negative matrix effects is more important. This technique was applied to determine paclobutrazol residues in soil corresponding with soil depth at mango orchard which was treated by soil drench method. The results showed high volume of paclobutrazol residue in upper soil layer (0-5 cm) after applica- tion, while low quantity was obtained in lower soil layer (10-20 cm). Moreover, the persistence of paclobutrazol residue was evaluated to be about 3-5 months.
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