This gcaptain article about bunker contaminated with phenols and styrene. I never came across this before.
I found out this about it:
The source of Phenols could be from the use of Shale Oil as cutter stock. Styrene, Indene and DCPD are refinery waste products which should not be present in the bunker fuel at these high levels.
(from the website mfame)
How do we treat for this?