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Reproducibility of calibration curves obtained with Cd(NO3)2 with 10−5 M NaNO3 as background over a period of 20 d with Cd2+-selective ISEs (see Experimental) whose inner solution contained EDTA (left panel) or tetraethylammonium chloride (Et4N+; right panel). Between measurements, the ISEs were stored in the dark in 10−7 M Cd(NO3)2 containing the same ionic background. Inserts: Long-term potential stabilities.
