Industry lawyers are raising concerns about the significant compliance and economic impacts that broad and varied PFAS definitions will have on businesses, criticizing federal and state regulators that employ such definitions, despite little scientific justification, while saying they should rather focus on specific chemicals that have been well-studied. “The fluorine-carbon bond is one of the strongest single bonds in chemistry, and it’s the bond that basically says to water, oil, grease and heat, ‘You can’t touch me,’” said Derek Smith,...