Trace Analysis of Metals by ESR. III. Determination of Silver by Solvent Extraction with Tetraethylthiuram disulfide Silver(II) Complex

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A new method was worked out for the determination of silver using ESR. Bivalent complex of silver with tetraethylthiuram disulfide extracted with carbon disulfide, benzene, carbon tetrachloride, xylene, ethylbenzene, toluene, chloroform, and organic solvents was stable. The complex in carbon disulfide gave a very strong ESR signal, the sensitivity being 0.1 ppb. The amount of solution required was 1 m<I>l</I>. Colorimetric method can also be applied. However, the sensitivity was lower than that of ESR method. Silver was determined photometrically at 620 nm as a complex with tetraethylthiuram disulfide. The absorption followed Beer's law in the range 10–100 ppm of silver concentration at 620 nm. Bivalent silver complex could be selectively extracted in the presence of several ions, except copper(II) and mercury(II). Results of the continuous variation method indicate that the silver(II)-tetraethylthiuram disulfide ratio in the complex is 1 : 1.
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