Saturated calomel electrode reactivity

Data are also available with a-acetylenic aliphatic sulphones, which involve only two steps i.e., saturation of the triple bond without subsequent cleavage of the Caliphalic—S bond, since it is not reactive. However, the introduction of an aromatic ring to the S02 group does not lead, contrary to what is observed with enones, to a potential shift toward less reducing potential values. Thus, the aromatic moiety introduced apparently does not bring any additional conjugation effect but even seems to decrease the activation of the unsaturated bond, as shown by data in Tables 6 and 7 where most of the potentials refer to the same saturated calomel electrode under similar experimental conditions. 

Saturable dye absorber, 14 677 Saturated aqueous salt solution, 9 34 Saturated calomel electrode (SCE), 9 571 Saturated fatty acids, 10 829, 830 Saturated hydrocarbons adsorbent affinity, 1 674 adsorption by zeolites, 1 624 fluorine reactivity with, 11 831 isomerization of, 12 172—173 Saturated polyester resins, based on trimethylpentanediol, 12 673 Saturated polyesters, 10 7 Saturated synthetic rubber, 10 705 Saturation and coating processes, 10 12-13 Saturation bonding, 17 509-510 Saturation color, 19 262 Saturation concentration, 15 677 Saturation index... 

Thus, besides its toxicity, mercury cannot be used at potentials more positive than -0.3 to +0.4 V versus the saturated calomel electrode (SCE) because of the ease with which Hg is oxidized. At relatively high anodic potentials, noble metal electrodes are also subject to a loss of activity as a result of surface oxide formation [T3] and adsorption of partially oxidized reactant molecules [4,5]. Glassy carbon (GC) is normally deactivated after a long-time exposure to electrolyte solutions, although many methods for its reactivation have been suggested (see ref. 6 and references therein). The use of carbon (or graphite) electrodes in the anodic voltammetry is also rendered difficult by interference from oxidation background currents that are not precisely reproducible. 

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