mole_concentration_of_dissolved_organic_mercury_in_sea_water mol m-3 [MLM3] "Mole concentration" means number of moles per unit volume, also called "molarity", and is used in the construction "mole_concentration_of_X_in_Y", where X is a material constituent of Y. A chemical species or biological group denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". "Dissolved organic mercury" refers to mercury that is covalently bonded to carbon (organic forms) and are present in water in dissolved form, often occuring as ionic species (e.g., methylmercury, CH₃Hg⁺; ethylmercury, C₂H₅Hg⁺), or as complexes with dissolved molecules (e.g., mercury bound to dissolved organic matter, Hg–DOM).