HJ 1067-2019 Headspace Gas Chromatography for Detection of Benzene Compounds in Water

The HJ1067-2019 standard is applicable for the determination of eight benzene derivatives, including benzene, toluene, ethylbenzene, p-xylene, m-xylene, o-xylene, isopropylbenzene, and styrene, in surface water, groundwater, domestic sewage, and industrial wastewater.

When the injection volume is 1.0 ml, the detection limit of this standard for determining benzene derivatives in water is 2ug/L~3ug/L, and the lower limit of determination is 8ug/L~12ug/L.

Method principle:

Place the sample in a sealed headspace bottle, and under certain temperature and pressure, the volatile components in the headspace bottle evaporate into the headspace space, generating vapor pressure. When the gas-liquid phase reaches thermodynamic dynamic equilibrium, the concentration of benzene derivatives in the gas phase is proportional to the concentration in the water phase within a certain concentration range. Quantitative extraction of the gas phase is separated by gas chromatography and detected by a hydrogen flame ionization detector. Qualitatively based on retention time and quantitatively using the external standard method of the working curve.

The fully automatic headspace sampler is equipped with a FID gas chromatograph and a WAX chromatographic column to detect the content of benzene derivatives in water.