Chapter 4 Testing samples
41
OsmoTECH® Single-Sample Micro-Osmometer User Guide
4.6 Repeatability tips
• Treat all samples, standards, and reference solutions
uniformly before the test.
• Discard ampules after use. Do not store open ampules
with Parafilm
®
.
• Keep sample containers closed when not in use.
Micro-samples are more susceptible to contamination
and evaporation than larger samples. Cold samples are
susceptible to condensation; warmer samples are
susceptible to evaporation.
• Only use the sampler that was supplied with your
instrument or one that is listed in the parts and
accessories section of this User Guide. Each sampler
comes with specific operating instructions and
re-order information.
• Cross-contamination from previous samples can aect
the result obtained from a subsequent test. To
minimize this eect when testing samples whose
expected range is appreciably dierent from that for
previous tests, run two or more replicates of the new
sample and disregard the first result. Also, be sure to
clean the cooling chamber and sampler properly after
each test.
• If an occasional sample produces irregular results but
the instrument has been producing accurate readings,
discard the irregular readings and repeat the sample in
question.
• For repeat runs, use additional samples from the same
source.
• Proper cleaning of the cooling chamber between tests
is very important. Follow the procedure given in this
chapter. Never inject anything into the cooling
chamber.
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