Abstract
The indigo trisulfonate method has been proposed in the current edition of Standard Methods for the Examination of Water and Wastewater, published in 1989, for measuring ozone residual in water and wastewater. A potential interference to the proposed method is the presence of suspended matter in the sample. The effects of this potential interference, as well as possible corrections, were investigated. To the extent that membrane filtration can remove the confounding substances without removing the indigo color, it can prevent this interference.
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