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- W2022164381 abstract "A method is described for the determination of urea turnover in marine sediments. 14C-urea was injected into sediment cores and 14CO2 and the total 14C content were measured in a time-course incubation (29, 72, 109 and 141 min). he method is a true-tracer technique as the addition of urea does not significantly alter the ambient concentration. Urea was not bound or adsorbed to the sediment, within the time span of the incubation, indicating that it was a free porewater pool of urea that was turned over. The turnover rate of urea was calculated by means of three different isotope-dilution models. Model I described nonsteady-state conditions and was the valid model for this study. Models II and III were both steady-state models and were invalid. The urea pool was assumed to change linearly with time in Model I and to remain constant in Models II and III. The 14C-urea pool was predicted to decrease exponentially in Models I and II and to decrease linearly in Model III within a short time span in the beginning of the incubation. The turnover rate was slightly overestimated, 21%, on an areal basis, when Model II was applied and severely overestimated, 33%, when Model III was applied. We suggest macrofauna to be responsible directly and/or indirectly for a major part of the urea production and urea to be the main source for NH4+ mineralization, in the study area." @default.
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- W2022164381 date "1989-06-01" @default.
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- W2022164381 title "Urea turnover in a coastal marine sediment measured by a 14C-urea short-term incubation" @default.
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