GB/T 39298-2020Reclaimed water quality - Determination of benzene homologues - Gas chromatography (English PDF)

1 Scope

This standard specifies the determination method of benzene series in reclaimed water-gas chromatography.

This standard applies to the contents of eight benzene series such as benzene, toluene, ethylbenzene, o-xylene, meta-xylene, p-xylene, styrene and cumene in reclaimed water

For the measurement in the range of 0.5µg/L~100µg/L. This standard is also applicable to the determination of benzene series content in surface water, industrial water and domestic water.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article

Pieces. For undated references, the latest version (including all amendments) applies to this document.

GB/T 5750.2 Standard Test Method for Drinking Water Collection and Storage

GB/T 6682 Analytical laboratory water specifications and test methods

GB/T 14424 Determination of residual chlorine in industrial circulating cooling water

3 Terms and definitions

The following terms and definitions apply to this document.

4 Principle

The benzene series in the sample is purged by high-purity nitrogen and adsorbed in the trapping tube. The trapping tube is heated and blown back with high-purity nitrogen to be thermally desorbed.

After the incoming components are separated by gas chromatography, they are detected with a hydrogen flame ionization detector (FID) to qualitatively use the retention time.

Quantitatively calculate the content of each component based on the peak height or peak area.

5 Reagents or materials

Warning---The strong acid used in this standard is corrosive. Avoid inhalation or contact with the skin when using it. Splash on the body and use a large amount immediately

Rinse with water, and seek medical attention immediately in severe cases. Organic reagents have strong volatility and toxicity, are harmful to human health and flammable.

Carry out in a wind hood to prevent contact with open flames, and wear protective equipment as required. When inhaling, you should quickly evacuate the scene to a place with fresh air […]