QUANTITATIVE DETECTION OF ENVIRONMENTALLY IMPORTANT DYES USING DIODE LASER FIBER-OPTIC RAMAN-SPECTROSCOPY/

A compact diode laser/fiber-optic Raman spectrometer is used for quant itative detection of environmentally important dyes. This system is ba sed on diode laser excitation at 782 nn, fiber-optic probe technology, an imaging spectrometer, and a state-of-the-art scientific CCD camera . The dyes studied include trypan blue, acid black 1, acid blue 40, an d basic blue 7. Detection sensitivities (at rms S/N = 2) ranged from 0 .2 ppm (3.24 x 10(-7) M) for acid black 1, to 25 ppm (4.86 x 10(-5) M) for basic blue 7.