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The dual—beam pulsed thermal lens(TL)technique was employed to determine the environmental pollutants (nitrophenols)．The detection limits of 4-nitrophenol in ethanol was 5．0×10－6 mol/L．The factors that influence the thermal lens effect，such as the characteristics of solvents，the excitation laser power，the loading resistance，the system response time，and the aqueous solution pH value，were also investigated in this paper．
