1. Spackman, D.H., Stein, W.H. and Moore, S., Anal. Chem., 30, 1190 (1958).
2. Durrum DC-3 Resin, Durrum Chemical Corporation, Palo Alto, California.
3. Pico-Buffer(E)System, Durrum Chemical Corporation, Palo Alto, California. (reg. U.S. Patent Office, Washington, D.C.)
4. Details of experiments leading to some of the conclusions of this section, as well as the mechanism of action of the Pico-Buffer System will be discuss in a subsequent report, in preparation.
5. Hamilton, Paul B., Bogue, Donald C., and Anderson, Roberta A., Anal. Chem., 32, 1782 (1960).