GB/T 14204-93 Water Quality Determination of Alkyl Mercury Using Gas Chromatography
The Chinese national standard GB/T 14204-93 defines the method of testing for alkyl mercury in water samples. The purpose of this method is to detect and quantify the concentrations of alkyl mercury present in water. This method is applicable to various natural and artificially treated waters, such as surface water, drinking water and industrial wastewater.
Alkyl mercury compounds are highly toxic and are known to be present in many water samples. Determining the presence of these compounds can be difficult and requires special laboratory and instrumental techniques. The procedure outlined in this standard allows for the rapid and accurate measurement and identification of alkyl mercury compounds by means of gas chromatography.
A special instrument is required for the analysis of alkyl mercury. A suitable chromatograph should be used, with an appropriate detector, column and sample tray. In addition, an appropriate stationary phase is required for the analysis. The sample is set up in the chromatograph and its components are separated as they move through the chromatograph column. As they pass through the detector they are monitored and recorded. Depending on the type of detector used, specific compounds can be identified.
The method involves the collection and preparation of the sample, followed by the extraction of the alkyl mercury compounds. The sample is then diluted and injected into the chromatograph where it is separated and identified. The concentration of the alkyl mercury is then calculated based on the data acquired by the chromatograph.
This national standard provides a complete procedure for measuring and identifying alkyl mercury in water samples. The method is safe and accurate and can detect concentrations as low as 0.01 μg/L. It is recommended for use in laboratories considering the analysis of potentially toxic water samples.
