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The biotransformation of nonylphenol was investigated in an agricultural soil treated with a mixture of 14C-labelled and unlabelled surfactant. It was then studied in soil samples amended with sludges spiked with the mixture of chemicals. Nonylphenol amount in all samples of soil and soil/sludge mixtures was 40 mg kg−1. In the soil free of sludge, the half-life of nonylphenol was found to be 4 d....