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. Author manuscript; available in PMC: 2017 Mar 21.
Published in final edited form as: Analyst. 2016 Mar 21;141(6):1930–1938. doi: 10.1039/c5an02530c

Figure 6.

Figure 6

Effects of retaining currents on subsequent ejections. (A) Oxidation current at a carbon-fiber electrode for ejections of 5 mM HQ and NaCl. +30 nA ejections were performed following a 5 min waiting period at the designated retaining current. This was repeated four times with characterization occurring on the last ejection of the series. (B) Iontophoretic pump voltage for the ejections in part A. (C) Decline in HQ oxidation current of HQ after waiting periods (n=6). Control ejections were performed prior to the start of the series described above. This was compared to the HQ oxidation current of the final ejection. The current value was recorded as the average oxidation current during the last 5 s of the ejection.