The 1-Furoyl-3-Ciclohexyl Thiourea As Ionophore Mercury (II) Ion Selective Electrode. Twice Nernstian Response

With 1-Furoyl-3-Ciclohexylthiourea as neutral mobile carrier, a selective liquid membrane electrode to mercury (II) was developed. The PVC membrane was deposited dropwise directly into a composite graphite- epoxy support.The sensor exhibits a Twice Nernstian response for both pH: The experimental slope at pH = 7.0 was 59.15 ? 1.38 mV per decade and the experimental slope at pH = 4 was 29.66 mV per decade. The ISE minimum lifetime is 10 weeks, with a response time of 27 s. The ISE showed a good selectivity for mercury, The selectivity coefficients Kpot were obtained by four method. Only one interference for Ag+ was found.