N-heptane-n-hexane is commonly used in chromatographic analysis, including the purity used in various chromatographic instruments and methods. Purity has no mandatory purity or some data value requirements, such as gas chromatography – stationary liquid, thin layer chromatography, boiling point, polarity, density, etc. When ethanol should have purity, the purity should be upgraded to “pure” requirements and requirements. Or some kind of octane skill data and numerical requirements. N-heptane chromatograph is an ideal chromatograph that connects headspace sampler with various types of gas chromatographs to collect volatile components in liquid or solid samples and directly introduce them into gas chromatograph for separation and detection.
Compared with liquid-liquid extraction and solid phase extraction, n-heptane-n-hexane can not only avoid the loss of volatile compounds in the process of solvent removal, but also reduce the noise caused by CO extraction. It has higher sensitivity and analysis speed, less harm to analysts and environment, and easy to operate. It is a kind of green analytical chemistry ”Analysis means required.
N-heptane-hexane headspace chromatograph can be divided into static headspace analysis, dynamic headspace analysis and headspace solid phase microextraction. The use of n-heptane chromatographic purity can avoid the tedious sample pretreatment process, avoid the interference of impurities brought by organic solvents, and reduce the pollution of chromatographic column and injection port; Headspace chromatography has been widely used in environmental detection (such as volatile halogenated hydrocarbons in drinking water and volatile organic compounds in industrial wastewater), detection of residual organic solvents in drugs, food, forensic science, petrochemical industry, packaging materials, coatings and wine industry analysis.