:As you were previously told at the WP:Conflict of interest/Noticeboard, working for the EPA does not constitute a conflict of interest in Wikipedia's terms.  Unlike what you may be used to in the real world, simply having a close connection to a subject is not a conflict of interest on the English Wikipedia.  To violate the WP:COI guideline here, you have to be actually (1) harming Wikipedia (2) for the purpose of helping yourself in the real world.  Disagreeing with you about these chemicals does not constitute harming Wikipedia, and the idea that someone's career depends on what Wikipedia says about these chemicals is silly.  
 :If you have concerns about the content dispute, then you need to pursue it as a content dispute, which means requesting help at the WP:Neutral point of view/Noticeboard and being willing to accept the answer you're given there even if you don't like it.