The experimental details, and supporting data, of a field method using an ambient temperature aqueous ammonium-citrate solution to extract heavy metal ions from soil and alluvium, and a xylene solution of dithizone to determine the concentration of the heavy metal ions, are given. The method is extremely rapid because the aqueous and xylene solutions are simultaneously added directly to the sample and no heating is required. The method usually gives a positive test with soils or alluvium containing 100 parts per million of combined copper, zinc and lead and is well adapted to field use because analyses may be made as rapidly as the samples are collected.

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