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The main difference between volatile and semivolatile is the difference in boiling point. The boiling point of volatiles is 50°C-240°C, while the boiling point of semivolatiles is 240-400°C. Most volatiles/semivolatiles have uncomfortable special odors, toxicity, irritation, teratogenicity and carcinogenicity, especially benzene, toluene and formaldehyde. Not only that, the volatiles/semivolatiles in the atmosphere will generate the main precursors of photochemical smog pollutants, and are also an important source of toxic and harmful organic components in the fine particles of the atmosphere, which can cause haze.
In order to optimize the ecological environment of the earth, the detection of the volatile/semi-volatile content in the environment is very important. The determination of the volatile/semi-volatile content still requires the use of standards for qualitative and quantitative analysis.
Air quality testing: In the process of detecting air quality, solid adsorbents are mainly used to enrich the volatiles/semivolatiles in the environment, and the adsorption tube is put into the thermal desorption instrument, separated by gas chromatography and detected by mass spectrometry. The result needs to be compared with the standard spectrum of the target to be tested and the retention time is used for qualitative. Standard spectra are obtained by detecting volatile/semivolatiles and analyzing standards.
Water quality testing: Semivolatile compounds are easy to accumulate in water and cause serious effects on water quality. Semivolatiles evaporate relatively slowly at standard temperature and pressure, and include a variety of key pollutants, such as polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs) and pesticides. Many of these compounds are thought to be carcinogenic, mutagenic, and may interfere with our endocrine system. This requires efficient, accurate and reliable trace analysis to obtain water that meets quality standards. Using standard substances for analysis can accurately and efficiently analyze water sample data.
Alfa Chemistry is one of the largest providers of volatiles/semivolatiles analytical standards in the world and the quality assurance is of prime importance to Alfa Chemistry. The solvent from Alfa Chemistry in the world is synonymous with reliability and excellent quality. Because of the exacting nature of our business and the regulatory demands placed upon our industry, Alfa Chemistry continues to be at the forefront in terms of compliance, accreditations and certifications.