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This research focused on the comparison of low-cost methodologies to determine ionic nitrogen and phosphorus fluxes across the soft sediment-water interface in Ciénaga Grande de Santa Marta. In situ transparent incubation chambers and sediment cores for laboratory incubation were employed. It was found that inside the incubation chambers, a depletion of dissolved oxygen occurred, thus the incubation could not be extended for more than six hours, an insufficient time to detect important variations in the concentration of the analyzed ions. Furthermore, the chambers were difficult to handle. Twenty-four-hour sediment core incubation in the laboratory did not have the above-mentioned problems. Oxygen concentration could be kept constant, and ion concentration changes were generally large enough to allow quantitative estimations of the fluxes.
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