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General Information
sample, and a distillation such as those enabled by the Micro Dist
system.
When large-scale glassware is used for such distillations, one
generally does not distill a set of calibration standards because this
reduces the already limited sample throughput of the distillation
step. At best, one occasionally distills a check standard. This is not
an ideal method of calibration.
With the Micro Dist system, the manufacturer recommends distilling
a set of standards at least once a day, or once every batch of
samples. The Micro Distilled standards should then be used as the
calibration standards for the method used to determine the
samples.
This investment in data quality will give the best possible data as
both standards and samples will be carried all the way through the
distillation. For example, doing this will correct for any distillation
reagent blank.
2.4 Trapping Solutions in the Collector Tube
When working with pre-filled tubes, the collector tube comes with a
trapping solution suitable to the Micro Dist Method. Some tubes
such as the phenolics method tube do not contain trapping solution.
Be sure to use the Micro Dist tubes which match the Micro Dist
Method. The Micro Dist Method will define the trapping solution;
see Table 3 on page 67.
When using the User-Fill option, there will be no trapping solution in
the collector tube; it is added as part of the method.
2.5 Shelf Life of the Pre-filled 21 tube Kits
Open the tube kit package and write the date next to “Opened on:”.
Use all 21 tubes within two weeks, if possible. If all 21 tubes are not
used, re-seal the tube kit package with tape to prevent the trapping
solution from evaporating from the collector tubes. Unopened
packages of tubes are best when used within 24 months.
For the User-Fill option, there will be no trapping solution in the
collector tube and, therefore, no need to keep track of shelf life as
there is no trapping solution to evaporate. User-Filled tubes should
be used the same day as filling.
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