The calibration
plot for 4-nitrophenol determination is linear in the range of 5.0×10−8 M–1.0×10−5M under optimum
conditions. The detection limit is 1.1×10−8 M. The proposed method was successfully employed to determine
4-nitrophenol in lake water samples, and the recoveries of the spiked 4-nitrophenol were excellent
(92–106%).