Determination of carbaryl and biphenyl through optical fiber ccd-assisted flash lamp induced room temperature phosphorescence.

A fiber-optic sensor for solid surface room temperature phosphorescence of carbaryl and biphenyl pesticides was designed. A xenon flash lamp was used as excitation source, and a cooled two-dimensional charge coupled device was employed as the detector. Room temperature phosphorescence spectra of carbaryl and biphenyl were recorded by an imaging spectrograph. Limits of detection at the picogram/spot level were obtained for the investigated compounds. The linear dynamic range extended over three orders of magnitude. The standard addition method and the internal standard method were employed to analyze the studied compounds in mixtures. The feasibility of the SS-RTP apparatus developed was evaluated by the identification of carbaryl in a real sample.