I have read in the document "Publication recommendation for the EDA" ( http://download.xuebalib.com/xuebalib.com.7601.pdf ) that,
For EDA recording, electrode gel or paste must contain a chloride salt, with NaCl being most often used. Concentrations in the range of 0.050–0.075 molar (0.3%–0.4% by weight) are preferred, because they approximate the concentration of NaCl in sweat that reaches the surface.
In ECG recording, the salt may have a concentration of 3% by weight (0.5 M), not far from seawater that is well tolerated by our skin for many hours.
Such salt concentrations are far too high for EDA recordings; therefore, pre-gelled commercially available ECG electrodes are not suitable for EDA recording. The same holds for gels sold for EEG recording.
But, do the pre-gelled electrodes delivered (Covidien Kendall H124SG) obey this? And what could be the implications (if in case, you have done some studies on this before)?