Pahū ʻo Shenhai
Hoʻopuka ka asphalt wela i nā kinoea i haku nui ʻia me nā hydrocarbons like ʻole, ʻoi aku ka polycyclic aromatic hydrocarbons.
Hoʻokomo ʻia ka asphalt i nā aspaltene, resins, nā hydrocarbons momona a me nā mea ʻala.
Ma muli o ka mālama ʻana i ka wela kiʻekiʻe a i ʻole ka hoʻonui ʻia ʻana o ka evaporation o ke kūlohelohe, ʻaila ʻaila, a me ka asphalt tar lanahu, ke kaʻina hana hoʻomehana e hoʻopuka i nā mea molekala liʻiliʻi, ʻO ke kaulahao lōʻihi a me nā hydrocarbons ʻala, ʻO nā molekala koʻikoʻi e like me ka naphthalene, anthracene, phenanthrene, a me benzo[a]pyrene.
He mea ʻawaʻawa ka polycyclic aromatic hydrocarbons a ua ʻike ʻia kekahi mau mea make kino.