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Description of BS 6069-3.4:1991 1991This International Standard specifies a charcoal tube/gas chromatographic method for the determination of the concentration of vaporous aromatic hydrocarbons in workplace air. The method is valid for the measurement of the concentrations of airborne vapours of any of the following compounds:
The method is valid for concentrations of airborne vapours of these compounds in the range from approximately 1 mg/m3 to 1 000 mg/m3 (about 0,2 ml/m3 to 200 ml/m3; see 8.1) when sampling 10 litres of air.
The method is also valid for the measurement of airborne concentrations of mixtures of these compounds. In such cases, the unique properties of each compound have to be considered when determining the volume of air to be sampled and the gas chromatographic conditions to be used. The method may be applicable for other substituted monocyclic aromatic hydrocarbons, but its validity has to be tested.
The method has been validated for a selection of typical aromatic hydrocarbons[1]. This procedure is compatible with low flow rate personal sampling equipment, and can be used for personal and fixed location sampling for obtaining time-weighted-average concentrations of aromatic hydrocarbon solvent vapours in air. It cannot be used to measure instantaneous or short-term fluctuations in concentrations. Alternative on-site procedures, such as gas chromatography or infrared spectrometry, shall be used to measure rapidly changing concentrations. Organic components which have the same or nearly the same retention time as the substance analysed during the gas chromatographic analysis will interfere. Interferences can be minimized by proper selection of gas chromatographic columns and programme conditions. Applicable to a variety of aromatic hydrocarbons in the range 1 mg/m3 to 1000 mg/m3 when sampling 10 litres of air.
About BSIBSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses. |
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