"false" . . "SDN:P07::6JIASUY6" . . "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. It means the ratio of the mass of X to the mass of Y (including X). 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\". Petroleum hydrocarbons are compounds containing just carbon and hydrogen originating from the fossil fuel crude oil."@en . "1" . "" . . "mass_concentration_of_petroleum_hydrocarbons_in_sea_water"@en . "1" . "SDN:P07::6JIASUY6" . "SDN:P07::6JIASUY6" . "2017-01-24 16:10:06.0" . "accepted"@en . . . "2017-01-24 16:10:06.0" . .