Resumen:
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A high-performance liquid chromatographic procedure was developed to quantitate the active ingredient in dipping vat samples containing comphos (CoRal), phosmet(Prolate), crotoxyphos (Ciodrin), synthetic permethrin (Atroban), amitraz (Taktic) or chlorpyrifos (Dursban). The procedure, based on chromatography with a short column(30x4,6mm I.D.) packed with 3-/um particles, allows three times as many samples to be analyzed per unit time as chromatography with a conventional column (100x5.0 mm I.D.) with 5-um particles. This increase in productivity was accomplished with normal operating conditions and standard equipment. There was also a corresponding reduction in solvent volume. Precision calculated from peak areas, was calculated to be less than 1% relative standard deviation while the minimum detectable amount of amitraz decreased from 700 to 300pg.
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