Abstract
Abstract A. C. polarographic studies of TMP, as well as a discussion of the polarographic behavior of TMP compared with that of B1 reported on in a previous paper, were carried out. TMP showed well-defined peak currents of almost the same Es values as the second peak current of B1 in the region of pH values <10, and obscure second waves were also observed at pH values between 1.75 and 3.00. The relation of the is of the first wave of TMP to the pH value was also similar to the second wave of B1. The wave corresponding to the first wave of B1, however, was not recognized for TMP under any of the conditions studied. The nature of the first wave of TMP was determined to be that of the diffusion currents, not of the adsorption, kinetic, etc. The number of electrons discharged could be ascertained by the millicoulometric technique as 9 at pH values <3 and 8 at a pH value of 4. The electrode reaction, therefore, of TMP was considered to be the same as that of B1. Some explanation of the relation of is to the pH value was attempted by reference to the pK values of TMP obtained from its experimental potentiometric titration curve.
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