Ambient air quality. Standard method for measurement of benzene concentrations - Pumped sampling followed by thermal desorption and gas chromatography Ingestion-build-58863 In addition to free glycerol:

In addition to free glycerol: water-soluble polyhydric substances with two or more adjacent hydroxyl groups

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BS EN 13189 provides you with guidance on the definitions

Ambient air quality. Standard method for measurement of benzene concentrations - Pumped sampling followed by thermal desorption and gas chromatography Ingestion-build-58863 In addition to free glycerol:1 Scope This part of EN 14662 gives general guidance for the sampling and analysis of benzene in air by pumped sampling, thermal desorption and capillary gas chromatography. This part of EN 14662 is in accordance with the generic methodology selected as the basis of the European Union reference method for the determination of benzene in ambient air [1] for the purpose of comparison of measurement results with limit values with a one year reference