What are PAHs (polycyclic aromatic hydrocarbons)?
Polycyclic aromatic hydrocarbons (PAH) are a kind of hydrocarbons with certain volatility, which can enter the human body through breathing, skin, food, drinking water and other channels. At present, there are 30 kinds of carcinogenic PAHs, of which benzopyrene (BAP) is a strong carcinogen, so there will be more strict restrictions on BAP.
Main components of PAHs (polycyclic aromatic hydrocarbons):
Eighteen main compounds of polycyclic aromatic hydrocarbons (PAHs) are naphthalene, acenaphthene, acenaphthene, fluorene, phenanthrene, anthracene, fluoranthene, pyrene, benzo (a) anthracene, Qu, benzo (b) fluoranthene, benzo (k) fluoranthene, benzo (a) pyrene, Indeno (1,2,3-cd) pyrene, dibenzo (a, H) anthracene and benzo (g, h, I) perylene, 1-methylnai and 2-methylnai.
The 16 common substances of PAHs identified at present mainly include:
1. Naphthalene naphthalene
2. Acenaphtylene acenaphthene
3. Acenaphtene acenaphthene
4. Fluorene
5. Phenanthrene
6. Anthracene Anthracene
7. Fluoranthene fluoranthene
8. Pyrene pyrene
9. Benzo (a) anthracene
10. Chrysene chicory
11. Benzo (b) fluoranthene
12. Benzo (k) fluoranthene
13. Benzo (a) pyrene
14. Indeno (1,2,3-cd) pyrene
15. Dibenzo (a, H) anthracene dibenzo (a, n) anthracene
16. Benzo (g, HI) perylene benzo (GHI) North (naphthalene intercalated benzene)
Products associated with polycyclic aromatic hydrocarbons (PAHs):
Polycyclic aromatic hydrocarbons (PAHs) often exist in petrochemical products such as crude oil, creosote, tar, dyes, plastics, rubber, lubricating oil, antirust oil, film remover, gasoline retarder, capacitor electrolyte, mineral oil, tar and other daily chemical products such as pesticides, charcoal, fungicides and mosquito repellent incense.
In the electronic and electrical manufacturing industry, PAHs usually enter the production process as plastic additives. For example, there is adhesion between plastic particles and molds during extrusion. At this time, release agent should be added, and the release agent may contain PAHs.
At present, the detection range of PAHs is:
Consumer products such as electronics and motors;
Rubber products, plastic products, automotive plastics, rubber parts;
Food packaging materials, toys, container materials, etc;
Other materials, etc;
National regulatory requirements for polycyclic aromatic hydrocarbons (PAHs):
So far, countries and regions have adopted written laws or decrees to determine: EU 76 / 769 / EEC; German: GS certification, lfgb; Us: EPA; China: GB, GB / T, GHz.
