"" . . . . "A dissolved radioactive or stable isotope tracer was added to the sample which was held for a predetermined time at an unstated (usually documented elsewhere) light intensity before filtration to collect the particulate phase. This was then treated with acid to remove inorganic carbon."@en . "accepted"@en . "SDN:S03::S03204" . "tracer doping, incubation at unspecified light level, filtration, acidification"@en . . . . . . . . . . . . . . . . .