Growth inhibition increased with increasing pKa of the nitrophenol tested (Table 1). In addition, strong pH depen-dence of toxicity was found for ONP, 4-chloro-ONP, and 4-methyl-ONP. Growth inhibition by these nitrophenols increased with decreasing pHof the medium. Thus, disso-ciated nitrophenols (low pKa, high pH) seemed to be less
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