Clinical Chemistry
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Clinical Chemistry 36: 544-546, 1990;
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Clinical Chemistry, Vol 36, 544-546, Copyright © 1990 by American Association for Clinical Chemistry

Sample evaporation and its impact on the operating performance of an automated selective-access analytical system

CA Burtis
Chemical Technology Division, Oak Ridge National Laboratory, TN 37831- 6194.

In a series of gravimetric and analytical experiments I measured how much analytical error is ascribable to sample evaporation during routine operation of the Dimension analytical system. This error, a time-dependent function, is related to the volume of liquid placed in either a 0.5- or 2.0-mL cup and whether the cup is capped. For the 0.5- mL cups, analytical error at a 4-h residence time ranged from 12% to 16% (uncovered) to 8% to 13% (covered), whereas errors for the 2.0-mL cup ranged from 6% to 10% (uncovered) to 2% to 5% (covered). To minimize evaporative loss, I recommend (a) protecting the surface areas of the samples, (b) using larger samples, and (c) minimizing the time that a sample is in its cup before and during analysis.


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 Clin. Chem.Home page
A. Neubauer, C. Wolter, C. Falkner, and D. Neumeier
Optimizing frequency and number of controls for automatic multichannel analyzers
Clin. Chem., May 1, 1998; 44(5): 1014 - 1023.
[Abstract] [Full Text] [PDF]


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