Iodoform taste complaints in chloramination

Iodoform (CHI₃) plus four of six possible iodo derivatives, CHClBrI, CHBr₂I, CHClI₂ and CHBrI₂ have been found in chloraminated drinking water. The presence of iodoform in concentrations > 5 μg l⁻¹ was associated with an objectionable medicinal taste in the water. Production of iodoform was dependant on the order of addition of the chlorine and ammonia.Throughout the report the order of addition of chlorine and ammonia will be defined by:—ammonia first then chlorine or —chlorine first then ammonia—implemented at Mundaring Weir from 12/5/86.