In the presence of 0.5 M H 2 SO 4 , silver quantitatively displaces copper from a hexane solution of copper dithizonate with a sensitivity of about 2 ppm. Copper, lead, zinc, and bismuth in very large amounts may suppress the recovery of silver, whereas mercury in amounts greater than 2 ppm will interfere. The presence of mercury may prove useful to the prospector who may remove it by roasting, if desired. Silver occurring either as sulfide or a chloride is detectable. A yellow and pink filter is used to view off-shade colors when they occur. Over 100 samples per man-day can be analyzed.

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