"the most difficult portion of the analytical process is that involving isolation
of the desired constituent in a measurable state. The actual process of measurement
is simple."
from: Ernest B. Sandell and Phillip J. Elving, Methods of Analytical Chemistry, Chapter
1 (p. 7) in Treatise on Analytical Chemistry Part I Theory and Practice; I. M. Kolthoff
and Phillip J. Elving (Eds.), 1959
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