title: Inorganic Precipitation of Carbon in Productivity Experiments Utilizing Carbon-14.
abstract: In a series of experiments where iron was added to natural waters and photosynthesis was measured by the radiocarbon method, we found that inorganic precipitation of carbon-14, presumably by mechanisms of occlusive coprecipitation, resulted from additions of 100 or more micrograms of iron per liter. Low levels of iron and prefiltered controls are suggested as correction measures.
authors.forename: C R
authors.initials: CR
authors.lastname: Goldman
authors.forename: D T
authors.initials: DT
authors.lastname: Mason