Polycyclic aromatic hydrocarbons (PAHs) refer to aromatic hydrocarbons containing two or more benzene rings. They mainly have two combinations, one is non-fused ring type, which includes biphenyl and biphenyl and polyphenyl substituted aliphatic hydrocarbons. The other is a fused ring type, that is, two carbon atoms are shared by two benzene rings. PAHs are toxic, genotoxic, mutagenic, and carcinogenic, and can cause many harms to the human body, such as damage to the respiratory system, circulatory system, nervous system, liver, and kidneys, and are identified as the main organic pollutants affecting human health.
PAHs in the environment are a class of compounds that are widely present, and more than 200 polycyclic aromatic hydrocarbons have been detected in the environment. For now, the main source of PAHs is the burning of coal and wood. The content of PAHs is one of the important criteria for evaluating air pollution and water pollution.
Analysis of PAHs in river sediments: PAHs have low solubility and hydrophobicity, will be strongly partitioned in the non-aqueous phase, and often adsorb on particulate matter. The sediment in the water environment is its main environmental fate. Due to the complexity of the sediment sample matrix, in order to obtain accurate and reliable analysis and test data and ensure the comparability of data between different laboratories, the sediment matrix standard sample derived from the actual environmental sample is an ideal standard reference. Therefore, such analysis often uses standard samples and samples to be tested for comparison, and reliable and stable data can be obtained.
Analysis of PAHs in rubber products: In the production process of rubber products, PAHs are inevitably contained in the product due to the use of added oil containing polycyclic aromatic hydrocarbons and other chemical substances. The determination standards of PHAs in rubber products are different, and the methods used are also different. Generally, nuclear magnetic resonance spectroscopy, gas chromatography-mass spectrometry or high performance liquid chromatography are used.
Analysis of PAHs in the atmosphere: In the atmosphere, PAHs mainly exist in the form of aerosols. With reference to standard methods, aerosol samples can be extracted ultrasonically, and the extracts are separated by silica gel chromatography column, and PAHs are identified by capillary gas chromatography and GC-MSD. The external standard method can be used to identify and quantitatively analyze a variety of PAHs.
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