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16.5 Sample material
Easy to determine are usually samples with the following characteristics:
Grainy to powdery, pourable solids
-
Thermally stable materials, emitting the moisture to be determined easily
-
without other substances evaporating at the same time
Liquids that vaporize to leave a dry substance without developing a film
-
Difficult to determine may be samples that are:
Glutinous or sticky
-
Become incrusted easily or tend to form a film
-
Decompose easily under the influence of heat or emit various elements
-
16.6 Sample size / originally weighted in quantity
Drying times, as well as achievable accuracy, are significantly influenced by sample
distribution. In the course of this arise two opposed requirements:
The lighter the originally weighted in quantity, the easier it is to achieve shorter drying
times.
However, the heavier the originally weighted in quantity, the more accurate a result
will be achieved. (example of a sample with ideal characteristics):
MLB_C-BA-e-1431
Poured
Reproducibility
quantity
0.5g
1g
2g
5g
10g
±0.6%
±0.3%
±0.15%
±0.06%
±0.03%
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