Continuous Control of Hypochlorite Concentration with Absorptiometric Method

Abstract

Having examined the measurement wavelength range free from interference by coexistent substances in exhaust gas, a 340 nm single beam absorptiometric analyzer for hypochlorite was made and installed in a deodorization plant for controlling hypochlorite concentration.
Long-term continuous control was proved to be feasible within a deviation of ±5% from a set hypochlorite concentration (lower than 1, 000 ppm) in the absorption solution (pH 11), under the following conditions; flow rate at the cell: 100ml/min, span adjustment: once two every weeks, zero calibration: automatically.