Patent ID: 7531360

Claim:
A method of detecting pollutants, including ClO 3 − and ClO 4 − ,in a circulating flow of water which contains disinfectant chlorine in the form of ClO − and HClO comprising the steps of: providing a reservoir containing an aqueous solution of ascorbic acid; rapidly mixing and homogenizing solution dispensed from the reservoir with the circulating flow in a static mixer to remove the disinfectant chlorine to form a treated circulating flow, and providing the treated circulating flow to a biological pollution detector in which fish are used as biological indicators, wherein the mass flow rate of ascorbic acid of the ascorbic acid aqueous solution is regulated with respect to the mass flow of the disinfectant chlorine, which is expressed in Cl 2 equivalence, such that the ratio of ascorbic acid mass flow rate to the disinfectant chlorine mass flow rate is greater than 2.5 and less than or equal to 3, so that ClO 3 − and ClO 4 − will not be eliminated from the circulating flow.