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Sampling and pH measurements The wastewater from the infectious and tropical diseases department (ITDD), with a capacity of 144 beds, of a hospital of a big city of the southeast of France have been selected.0.4?C) digit and standard electrode HI 1131 B (refillable glass combination pH electrode).This choice was justified by the fact that the ITDD collector does not receive effluents containing iodized X-ray contrast media from radiography department, substances which could be contributed to AOX concentrations.Wastewater was collected before entering into the entire hospital sewer network, which discharges the total volume of effluents from the various departments into the urban wastewater network without pre-treatment.0.01pH, mV ?0.2 mV ?1, ?C ?

Sampling and pH measurements
The wastewater from the infectious and tropical diseases department (ITDD), with a capacity of 144 beds, of a hospital of a big city of the southeast of France have been selected. Wastewater was collected before entering into the entire hospital sewer network, which discharges the total volume of effluents from the various departments into the urban wastewater network without pre-treatment. This choice was justified by the fact that the ITDD collector does not receive effluents containing iodized X-ray contrast media from radiography department, substances which could be contributed to AOX concentrations. Three samples per day were done in the connecting well department at 9 A.M, 1
P.M. and 5 P.M. during eight days from 13 March to 22 March 2001. A mixture has been made with the three samples at 6 P.M. in order to obtain a representative sample for the day. In the objective to avoid or decrease volatility process in samples, laboratory conditions controlling flow and turbulence have been considered during mixture preparations. Water sample was collected by means of a telescopic perch in a 1-L glass flask. pH was measured directly on site after sampling with a pH meter HANNA instrument HI 8417 (accuracy pH  0.01pH, mV  0.2 mV  1, °C  0.4°C) digit and standard electrode HI 1131 B (refillable glass combination pH electrode). All the water samples and the mixture were kept at 4°C until analysis.