... 2.0) in the multimedia environment at 25°C. For environmental pH from 4 to 7, there is no significant effect for p-cresol (or for chemicals for which pKa >> pH), very little effect for 2,4-dichlorophenol ... and 10.6 for the alkylphenols. The dissolvedconcentration in water is thus the sum of the undissociated, parent or protonated compound and the dissociated phenolateionic form. When the pKa ... various components of the environment, their toxicity, theirtendency to bioaccumulate, their persistence and their potential to be transported long distances. Some of these chemicals, including...