Fig. 2.

The reducing agent dithiothreitol (DTT) causes large voltage offsets in Ag/AgCl electrodes. Summary of the voltage offsets produced by 1 mM DTT. Two wire purities of 99.9 and 99.99% silver were examined. As in Fig. 1, bare wire (A), which simulates the use and poor chloriding scenarios, caused much larger offsets than chlorided wire (B). Note the much larger y-axis scale in A. See text and Fig. 1 legend for additional details; n = 4–8 in each group.