Abstract
ION exchange beads which are predominantly spherical and chemically uniform may be loaded with one or a combination of electrically charged counterions. The mass of such a bead, and of its exchangeable counterion content, is related to the particle diameter1, which can be measured precisely. This material is ideally suited for the stable localization of extremely small quantities of matter, so that the individual particles may be used as chemical microstandards. This capability depends on a high degree of chemical uniformity the attainment of which in carefully controlled conditions has been established2–4. It also depends on effective stabilization of the counterion content; this is attained by drying to prevent the diffusive processes of ion exchange.
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References
Freeman, D. H., in Ion Exchange (edit. by Marinsky. J. A.), 1 (Marcel Dekker, Inc., New York, 1966).
Pepper, K. W., J. App. Chem., 1, 124 (1951).
Wiley, R. H., J. Phys. Chem., 68, 1776 (1964).
Freeman, D. H., and Aiyar, A. S., Anal. Chem., 39, 1141 (1967).
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FREEMAN, D., PAULSON, R. Chemical Microstandards from Ion Exchange Resin. Nature 218, 563–564 (1968). https://doi.org/10.1038/218563a0
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DOI: https://doi.org/10.1038/218563a0
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