Igesi Ekhiqizwe Ngokushisisa Itiyela

Itiyela elishisayo likhipha amagesi akhiwe ikakhulukazi ama-hydrocarbon ahlukahlukene, ikakhulukazi i-polycyclic enamakha hydrocarbon.

Ukwakhiwa kwe-asphalt kuhlanganisa i-asphaltenes, izinhlaka, ama-hydrocarbon agcwele futhi anephunga elimnandi.

Ngenxa yokwelashwa kwezinga lokushisa eliphezulu noma ukuhwamuka okunwetshiwe kwemvelo, uwoyela, kanye netiyela lamalahle, inqubo yokushisa ikhiqiza izinto ezincane zamangqamuzana, ikakhulukazi ama-hydrocarbon anamaketanga amade namaphunga, ama-molecule abalulekile njenge-naphthalene, i-anthracene, i-phenanthrene, kanye benzo[a]i-pyrene.

Ama-polycyclic anuka kamnandi e-hydrocarbon anobuthi ngokuphawulekayo kanti amanye aziwa ngama-carcinogens.