Each phenol was dissolved in the distilled water to obtain a standard stock solution with the concentration of 1000gmL−1 and then stored at 4 ◦C. Working solutions were prepared daily by rigorous dilution of the stock solutions with the distilled water.
Each phenol was dissolved in the distilled water to obtain astandard stock solution with the concentration of 1000gmL−1and then stored at 4 ◦C. Working solutions were prepared daily byrigorous dilution of the stock solutions with the distilled water.