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[Photothermal deflection spectroscopy for the detection of fluoride ion content in water].

In this paper the application of photothermal deflection spectroscopy to the detection of fluoride ion content in water is described. This PDS method gets rid of two factors that impair the test sensitivity of regular photometric method applied to the measurement of solution concentration, and increases the sensitivity. That the PDS signal varied with modulation frequencies, pump laser powers and probe laser powers is discussed, and the appropriate parameters of test apparatus are chosen.