3. Preparation for Measurement
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3-2. Necessary tools
Prepare the following tools for measurement.
Tools for sampling
Beaker
A beaker is necessary when sampling test liquid by sampling pump.
Sampling pipette, syringe
Necessary for a viscous sample (lubricant, honey syrup, etc.) or liable with air bubble.
Tools for cleaning sampling tube
Waste cloth
Wipe off residual sample liquid or solvent in order to prevent from self-contamination.
Rinse solution for cleaning inside cell before sampling
Rinse solution 1 (dissolution)
Rinse solution 1 is for cleaning inside the cell.
Use a solution n that dissolves remaining sample in the cell.
Rinse solution 2 (drying)
Rinse solution 2 is for drying the cell.
Use a highly volatile solution that easily dissolves the rinse solution 1.
When satisfactory rinse solutions 1 and 2 are not available, add rinse solution 3 which can
dissolve both rinse 1 and 2 used in between two steps.
A highly volatile solvent can be used not only as rinse solution 1 but also 2 as well.
Typical rinse solutions are as shown below: (Select as necessary for sample character)
Beverage
Soft drink
Wine
Oil
Rinse solution 1
(dissolution)
Water
(Warm water)
Water
Toluene
Rinse solution 2
(drying)
Ethanol
Ethanol
Acetone
Warming
Some sample liquid or solvent is harmful.
Connect vent tube to exhaust fume for your safety.
Warning
Be aware of danger of strong acid like sulfuric acid
which generates heat when added to water.
Note
Use a solvent for drying the cell which also dissolves solvent
for cleaning sample liquid.
Hint
The cell dries more quickly with acetone than ethanol since
acetone is more volatile.
Содержание DA-640
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