Batch injection analysis with the rotating disk electrode

The use of the rotating disk electrode (RDE) for batch injection analysis (BIA) is illustrated. The technique involves injections of microliter samples into a large‐volume blank solution, at a fixed location below the disk center. Transient response peaks—similar to those of flow injection analysis—are observed, reflecting the transport of the sample plug toward and away from the RDE. The effects of various experimental variables on the BIA/RDE operation are described. Injection rates of several thousand samples per hour can be achieved, with relative standard deviations of 1–3%, and detection limits at the micromolar (ng) level.