Method for Testing Blood Alcohol Content "(GA/T 842-2019)

This standard was proposed by the Tianjin Public Security Traffic Management Bureau, under the jurisdiction of the National Road Traffic Management Standardization Technical Committee, and drafted by units such as the Tianjin Public Security Traffic Management Bureau and the Shanxi Provincial Public Security Department Traffic Police Corps. Released on April 19, 2019, implemented on May 1, 2019, with each version number being GA/T842-2009. This standard specifies the headspace gas chromatography test method for blood alcohol content, which is applicable for qualitative and quantitative analysis of alcohol in personnel's blood during road traffic law enforcement activities.


Blood alcohol detection chromatograph: With the implementation of the new Traffic Law, the detection of blood alcohol levels in drivers is becoming increasingly common. The qualitative and quantitative detection of blood alcohol content by headspace gas chromatography is a judicial recognized detection method. The specialized instrument developed by our company is equipped with a true headspace sampler, which eliminates the complicated pre-processing process, has high analysis efficiency, advanced detection methods, reasonable instrument configuration, accurate detection, and easy and simple operation. Suitable for all levels of departments, hospitals, and judicial appraisal centers. With the implementation of the new traffic law, the detection of blood alcohol levels among drivers is becoming increasingly common, and gas chromatography is the only legally and quantitatively recognized detection method for blood alcohol levels. The solution for detecting ethanol content in blood of Xuansheng Keyi Company is based on similar foreign detection methods


Automatically heat the sample according to the set value after startup; Needle insertion; Sampling; Fill the sample into the quantitative tube; Six way valve switching injection; Start the workstation to start sampling and recording work
Analysis is to determine the content of these components in the original sample by analyzing the gas composition above the sample matrix Obviously, this is an indirect analysis method, and its basic theoretical basis is that there exists a distribution equilibrium between the gas phase and the condensed phase (liquid phase and solid phase) under certain conditions So, the composition of the gas phase can reflect the composition of the condensed phase We can regard headspace analysis as a gas-phase extraction method, which uses gas as a "solvent" to extract volatile components from samples. Therefore, headspace analysis is an ideal sample purification method Traditional liquid-liquid extraction and SPE involve dissolving the sample in a liquid, inevitably leading to some co extracted substances interfering with the analysis Moreover, the purity of the solvent itself is also an issue, which is particularly important in trace analysis Using gas as a solvent can avoid unnecessary interference, as high-purity gases are easily obtainable and cost-effective, which is also an important reason why headspace GC is widely used
As an analytical method, headspace analysis is first and foremost simple, as it only takes the gas phase for analysis, greatly reducing the interference of the sample matrix on the analysis As a sample processing method for GC analysis, headspace is the most convenient Secondly, headspace analysis has different modes that can be adapted to various samples by optimizing operating parameters Thirdly, the sensitivity of headspace analysis can meet regulatory requirements Finally, combined with the quantitative analysis capability of GC, headspace GC is fully capable of accurate quantitative analysis