"Concentration of 2,3',4',6-tetrabromodiphenyl ether {BDE71 CAS 189084-62-6} per unit volume of the water body [dissolved plus reactive particulate phase]"@en . . "SDN:P01::MUM13263" . "Quantity or mass of the specified substance measured in a specified volume of an unfiltered sample from any body of fresh or salt water."@en . .