773mended as a reagent for the detection and determination of chlorine. Accurate results are obtained with as little as 0.05 p.p.m. of chlorine and the color formed is more stable than that given by any of the other amines. The color begins to fade only after 15 to 20 minutes, and then only at a very slow rate. Reproducible results are obtained, even in the lowest range of 0.05 to 0.5 p.p.m. examined. Comparisons can be made using standard calibration curves.Acetate buffers retard the development of the color and mineral acid interferes even in 0.0LV concentration. Other oxidants present in the solution will also interfere, but the procedures used in water analysis take full account of these interferences. In general, treated waters do not contain significant amounts of oxidants, other than chlorine.

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