Ion selective electrochemical sensors which respond to Fe+3 and Cu+2 have been developed. The sensor material consists of a chalcogenide glass (60% Se, 28% Ge, and 12% Sb) doped with Fe0, Co0, or Ni0. Response has been observed at concentrations as low as 10−6 moles/liter (0.056 ppm Fe) in both membrane and electrode configurations. Nernstian behavior is observed in the 10−5 to 10−1 moles/liter concentration range. Interference tests demonstrate good selectivity for Fe+3 in the presence of most cations, particularly Fe+2. Potential response behavior supports a redox potential mechanism rather than the ion exchange mechanism.
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Baker et al. (1971) studied this question.