"2009-07-06 15:41:29.0" . "1" . . "mass_concentration_of_hexachlorobiphenyl_in_air"@en . "Mass concentration means mass per unit volume and is used in the construction mass_concentration_of_X_in_Y, where X is a material constituent of Y. A chemical species denoted by X may be described by a single term such as 'nitrogen' or a phrase such as 'nox_expressed_as_nitrogen'. The chemical formula for hexachlorobiphenyl is C12H4Cl6. This structure of this species consists of two linked benzene rings, each of which is additionally bonded to three chlorine atoms."@en . . . . "false" . "SDN:P07::CF12N269" . "accepted"@en . . "SDN:P07::CF12N269" . . "SDN:P07::CF12N269" . . "2009-07-06 15:41:29.0" . "" . "1" .