GB/T 2366-2008Determination of water content in industrial chemicals - Gas chromatographic method (English PDF)

3.1 Warning

Some test procedures prescribed test method can lead to dangerous situations, the operator shall take the appropriate safety and health practices.

3.2 General Provisions

Unless otherwise indicated in the analysis using only recognized as analytical reagents and GB/T 6682-1992 the provisions of tertiary water.

3.3 Method summary

By gas chromatography, under the selected operating conditions, the standard sample and the amount of samples were injected into the gas chromatograph with the other components of the water

It was isolated, with a thermal conductivity detector and measurement sample and standard samples of water peak height or peak area, external standard method or internal quantitative addition.

3.4 Reagents

3.4.1 Carrier gas

hydrogen or helium, the volume fraction of not less than 99.9%, silica gel and molecular sieve drying, purification;

3.4.2

n-heptane;

3.4.3

Benzene;

3.4.4

anhydrous organic solvent; measured using the external standard method, product water content exceeds 0.1%, the same sample can be used with an organic solvent,

The organic solvent used traces of water or other molecular sieve dehydration after dehydration substance contained in Table A. 1 chromatographic determination of working conditions should be dry peaks,

And the organic solvent miscible with water having characteristics. Users may also need to choose other related reagents. It is also available commercially standard sample.

3.5 Instrument

3.5.1 Gas chromatograph

equipped with a thermal conductivity detector, sensitivity and stability of the machine should be consistent with GB/T 9722-2006 of the relevant provisions,

Chapter 1 had the lowest measured water content in the range of produce high peak should be greater than twice the noise. When analyzing a sample instrument to be equipped with high-boiling

Cleaning devices.

3.5.2 Recorder

chromatographic data processor or chromatography workstation.

3.5.3 Injector

micro-injector, 1µL or 10µL.