Abstract
A double-tube separation system with an inner tube of microporous PTFE and an outer tube of PTFE is proposed for the continous determination of trihalomethanes (THMs) in waters. The THMs in the sample, after reaction with sodium hypochlorite solution at 98°C and reducing the residual hypochlorite with sodium sulphite, are separated with the double-tube system at 50°C. They are then mixed with alkaline nicotinamide solution and heated at 98°C. After cooling in an ice-bath, the reaction product is fed to a spectrofluorimeter and the emission of fluorescence excited at 372 nm, is measured at 467 nm. The response was obtained within 20 min. The detection limit (signal-to-noise ratio = 3) was 2.2 μg 1 −1. The total THM formation potential obtained by the present method for lake and river waters were in good agreement with those obtained by the Japanese standard batch method.
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