A thin film of a mixed-metal NI-Fe(CN)e deposit on a glassy carbon electrode Is demonstrated to be a stable and durable electrocatalyst for the fairly Irreversible, and often Irreproducible, reduction of Fe(III) at the bare substrate. By use of an Indicator coated with such nickel(II) hexacyanoferrate

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The preparation, characteristics and analytical application of t h e chelate-forming resin Amberlite XAD-2 -PAR are described. The XAD-2 -PAR resin in the presence of tetren (tetraethylenepentaamine) was applied to the on-line isolation of silver prior to its determination by flame atomic absorption spectrometry. The over-all system provides signal enhancement and can be used for the rapid and selective separation and determination of silver in copper ores.

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