Photometric Titrations

“…It is usual in a photometric titration to plot milliliters of titrant against absorbance and to utilize the intersection of two lines drawn through the experimentally measured points to determine the end point (8). In the present work, considerable curvature was obtained in the region of the intersection making it impractical to determine VOL.…”

Section: Photometric Determination Of End Pointmentioning

confidence: 86%

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

Gedansky¹,

Gordon²

1957

Anal. Chem.

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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).

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“…It was decided to compare the two areas to see if both were favorable. Figure 4 shows the curves obtained for calcium at 540 and 660 mg and Figure 5 shows the curves for magnesium at 520 and When all curves were corrected for the dilution of absorbance by the titrating solution (11), those obtained at 520 and 540 mg, still did not exhibit very large absorbance differences for the two dye forms, while the 660-mg curves were increased by a much larger factor. However, the end points at 660 mg for dilutioncorrected or -uncorrected data are easy to plot and give the same results, so that for the purpose of titrating in the low milliequivalent range of normal and pathological spinal fluids 520 or 540 mg appear to be somewhat less desirable.…”

Section: Discussionmentioning

confidence: 98%