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A method has been developed for the determination of naphthaleneacetic acid in apples using a reversed-phase high-performance liquid chromatographic technique with methanolwater as the mobile phase and employing a spectrophotometric detector. The statistical parameters of the calibration and the details of the recovery and the extraction procedure are described.

The use of cetylpyridinium bromide, a cationic surfactant, added as a modifier to an aqueous acetonitrile mobile phase allowed good separation of the inorganic anions iodate, bromate, bromide, nitrite, nitrate, iodide and thiocyanate on a reversed-phase high-performance liquid chromatography column. Spectrophotometric detection a t 222 nm was used for the identification and determination of the anions. The method was applied successfully to the determination of nitrite and nitrate in human saliva.

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