Abstract
The application of pig slurry to soil can lead to environmental degradation, generating risks to human and animal health. Hormones and antibiotics may be present in slurries which may alter the human endocrine system and the synthesis, transport and production of hormones. The present work evaluates the transport of such chemical compounds in surface runoff and water draining through soil, by means of two lysimeters with different soil tillage, that also receive applications of pig slurry. Flows of water were generated using simulated rainfall at high intensity. Concentrations of the hormones estrone, estradiol and 17α-ethynilestradiol, and of the veterinary antibiotics toltrazuril, sulfadimidine, doxycycline, chlortetracycline, tetracycline and oxytetracycline were measured by high-efficiency liquid chromatography. Only three occurrences were observed in which concentrations were above the limit of detection, one in surface runoff and two in soil drainage. Many concentrations of hormones and antibiotics in both surface runoff and soil drainage occurred which were below the limit of quantification. The occurences of hormones and antibiotics were detected in both runoff as the drain below the quantification limit. The results do not show the influence of tillage systems in the transport of these molecules in the soil
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