Indirect Photometric Titration of Milligram Quantities of Silver with (Ethylenedinitrilo)tetraacetic Acid (II)

Abstract

differently so that one set of transparent secondaries is lying in the plane and another set of transparent secondaries, almost invisible to the observer and obscured by a third set of opaque secondaries, slants down into the plane. The third set is opaque and slants up toward the viewer away from the plane. Unetched, the stereoscopic field of these tiny structures was confusing and only two branches were recognized; partially etched, the three branches were distinguishable by reason of contrast differences. 16, 695 (1950).

Precision Absorptiometry

“…The logical extreme of general differential absorptiometry makes the scale correspond to as small a concentration range as possible. This can be done usefully in two cases without even using reference solutions, and thus not meeting the definition of differential, even though the principle is the same: photometric titrations (26) and teinophotometry (28). In these cases one does not need to know just what concentration range the scale corresponds to.…”