“…With a few exceptions (see below), MS has been mainly used in past studies for identifying and quantifying specific fractions or trace components within the marine DOM pool, as opposed to deciphering the structure and composition of bulk DOM. The main classes or species include specific biomolecules, such as proteins, , amino acids, sugars and complex carbohydrates, lipids including sterols, alkenes and fatty acids, , polyphenolics and dissolved lignin , and pheromones and other chemotaxis compounds; , volatile organic compounds and trace organic trace gases; − organic ligands; anthropogenic/pollutant compounds such as polyaromatic hydrocarbons, PCBs, pesticides and brominated compounds; , oil spill residues; , detergents and surfactants including alkylbenzenesulfonates and nonylphenol-ethoxylates; , pharmaceuticals and caffeine; organic iodine species and organic anti-foulants. − …”