How to choose when sample preparations?

We should choose sample preparation according to the characteristics of the sample:

1): sample contains gases.

There are different methods for the degassing of liquid samples. The best method for your application depends on the kind of sample, the kind of gas, and the amount of gas that is dissolved in the sample. Be aware of the fact that you may slightly change the composition of many samples during sample preparation due to evaporation of volatile components.
 

2): Sample is aggressive.

Observe all safety regulations regarding the handling of the samples, cleaning, rinsing and waste liquids (e.g. use of safety glasses, gloves, respiratory protection, etc.).

Check the chemical resistance of all materials which come into contact with the sample before starting the measurement.

3): Sample is viscous.

Heat up your sample to get lower viscosities.

For highly viscous samples use a heating attachment to prevent sample freezing in the sample in- and outlet.

If you use a sample filling system, check whether the viscosity corresponds to the given specifications.

4): Sample is volatile.

Close the sample vials with caps.

Gently swirl the vials to bring condensed droplets back into the bulk liquid.

For highly volatile samples use a sample filling unit which supports sample filling under pressure.