polycyclic

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Related to polycyclic hydrocarbons: Polynuclear aromatic hydrocarbons

polycyclic

[¦päl·i′sī·klik]
(organic chemistry)
A molecule that contains two or more closed atomic rings; can be aromatic (such as DDT), aliphatic (bianthryl), or mixed (dicarbazyl).
References in periodicals archive ?
The main compound groups in TBO obtained from Attarat oil shale in pyrolysis without any solvent and in benzene or water are polycyclic hydrocarbons and polar hetero-atomic compounds, making both 30-45% of TBO.
Tests on samples at the council-owned Leckwith allotments in Cardiff uncovered levels of heavy metals and polycyclic hydrocarbons - which can be cancer-causing - significantly above guidelines laid down by both the Food Standards Agency and the Government.
The JRC-IRMM Reference Laboratory for polycyclic hydrocarbons (PAH) is developing and endorsing the harmonisation and standardisation of PAH measurements in the EU.
Short description (5 lines) of planned objectives: The overall objective of the project is to improve air quality by supporting the implementation of the air quality related legislation including Directive 2008/50/EC on ambient air quality and cleaner air for Europe and Directive 2004/107/EC relating to arsenic, cadmium, mercury, nickel and polycyclic hydrocarbons in ambient air.

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