Table 4-1. Experimental scheme for adsorption study.

---------------------------------- ------------ -----------
 [Treatment] [Conc.] [Sample]

 1 mg/l phenol
 2ml sludge + 6mg/l NaN3 5 mg/l DCP
 2ml sludge + 2mg/l NaN3 7.5 mg/1 PCP
 no sludge + 2mg/l NaN3 (By) 10 mg/l (By) mixture



 Batch desorption. The desorption study was performed

following adsorption study. Aqueous portions of the samples

were drained (only about 10 ml could be drained) and the

sample vials refilled with 10 ml of distilled water. The

samples were tumbled continuously by a rotator at room

temperature (approximately 230C) for 40 hours before

analysis of phenolic compound concentrations.


 Extraction recovery. The purpose of the extraction

recovery study was to account for all chemical masses and to

determine the efficiency of methanol extraction. This

measurement was necessary in order to determine whether

concentration decreases were caused by biodegradation or by

adsorption later in the degradation experiments. The

extraction recovery was performed following the desorption

study. Aqueous portions of the samples were drained and

refilled with 10 ml of methanol. Samples were tumbled at

room temperature for 3 hours before analysis.


 Calculation methods. The amount of each compound

adsorbed to the soil (X/m) were calculated by dividing the

difference between the initial mass in the system and the