In a previous paper we described a dithizone-emulsion technique by which it was feasible to detect as little as 0.001 p.p.m. (parts per million) of copper and zinc in natural waters.In practice this method has one major drawback. The dithizone has to be introduced in the form of an ammoniacal aqueous solution which is not stable and normally must be renewed once or twice each day.An acetonic solution of dithizone is much more stable than an aqueous one. This stability makes it possible in the field to use an acetonic solution of dithizone for weeks, or even months if temperatures remain below 80 degrees to 90 degrees F.The use of acetonic dithizone affords new possibilities in field and laboratory techniques which are discussed.

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