Table 2: Characteristics of the calibration graphs for the different phenolic compounds.

Compound Linear range ( M)Detection limit ( M)
Slope ( )Intercept ( )

Phenol 0.1–2600.0940.998
4-Chlorophenol 0.4–1800.380.999
2,4-Dichlorophenol 0.4–1200.390.998
2,4,6-Trichlorophenol 1.0–900.300.998
Pentachlorophenol 2.0–1100.330.996