Various concentrations of iodine were employed to inactivate faecal indicator bacteria in low quality water at different turbidities in three pH ranges. The results obtained were compared with those of an arbitrarily selected standard of 1.0 mg/l chlorine. Under all the conditions, for which dosages of 4.0 or 8.0 mg/l iodine were used, a water of virtual potable quality was obtained within a 30 min contact period. Under none of the conditions investigated was a dosage of 1.0 mg/l iodine found to be an effective disinfectant while both 1.0 mg/l chlorine and 2.0 mg/l iodine were generally effective in the lowest pH range investigated and at low turbidity but the disinfecting effect in both cases decreased with increasing pH and increasing turbidity. © 1989.
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