Ammonium adsorption in superficial North Sea sediments

Ammonium Adsorption by Surface Sediments in the Loughor Estuary, UK

“…Samples with a small mean particle size have a larger overall surface area per unit diameter and therefore will have a high ammonium adsorption coefficient. The present study shows that samples with a 65 µm grain size, had the highest ammonium adsorption coefficient when compared to the other samples with a larger mean grain size; this result agrees with the findings of Raaphorst and Malschaert (1996) [29].…”

“…Sediments at Site 1b were found to be higher in carbon content when compared to the sediment samples taken from Site 2. It was found that the organic carbon content had a significant effect on the ammonium adsorption and this result agreed well with previous studies, such as those of de Lange, (1992); and Raaphorst and Malschaert, (1996) [29], [30]. The samples from Site 1b were found to have higher ammonium adsorption values than those at Site 2.…”

Ammonium Adsorption by Surface Sediments in the Loughor Estuary, UK

“…Samples with a small mean particle size have a larger overall surface area per unit diameter and therefore will have a high ammonium adsorption coefficient. The present study shows that samples with a 65 µm grain size, had the highest ammonium adsorption coefficient when compared to the other samples with a larger mean grain size; this result agrees with the findings of Raaphorst and Malschaert (1996) [29].…”

“…Sediments at Site 1b were found to be higher in carbon content when compared to the sediment samples taken from Site 2. It was found that the organic carbon content had a significant effect on the ammonium adsorption and this result agreed well with previous studies, such as those of de Lange, (1992); and Raaphorst and Malschaert, (1996) [29], [30]. The samples from Site 1b were found to have higher ammonium adsorption values than those at Site 2.…”

Dynamics of Inorganic Nutrients in Intertidal Sediments: Porewater, Exchangeable, and Intracellular Pools

“…Concentrations were generally higher in the upper part of the sediment, decreasing with depth, and higher during late autumn months, when chlorophylls and OM were also highest. EX nutrients concentration measured in Cadiz Bay sediments are similar to those in other muddy sediments from coastal areas, where a large temporal and spatial variability was also reported (Laima, 1992 ; Van Raaphorst and Malschaert, 1996 ). For example, Laima ( 1992 ) found higher following the phytoplankton sedimentation in Aarhus Bay (Denmark) with values up to 1400 nmol cm −3 at the sediment surface, similar to the ones measured here.…”

Nitrogen in Ancient Mud: A Biosignature?

“…This relationship applies over a wide range of NH 4 + concentrations, and it reproduces measured values in other settings ( e.g. , Rosenfeld, 1979; van Raaphorst and Malschaert, 1996). [It is preferred here over alternative formulations by Abdulgawad et al (2009) because the experiments by Boatman and Murray (1982) were carried out under more controlled conditions.]…”

Ammonium Adsorption by Surface Sediments in the Loughor Estuary, UK

“…Samples with a small mean particle size have a larger overall surface area per unit diameter and therefore will have a high ammonium adsorption coefficient. The present study shows that samples with a 65 µm grain size, had the highest ammonium adsorption coefficient when compared to the other samples with a larger mean grain size; this result agrees with the findings of Raaphorst and Malschaert (1996) [29].…”

“…Sediments at Site 1b were found to be higher in carbon content when compared to the sediment samples taken from Site 2. It was found that the organic carbon content had a significant effect on the ammonium adsorption and this result agreed well with previous studies, such as those of de Lange, (1992); and Raaphorst and Malschaert, (1996) [29], [30]. The samples from Site 1b were found to have higher ammonium adsorption values than those at Site 2.…”

Dynamics of Inorganic Nutrients in Intertidal Sediments: Porewater, Exchangeable, and Intracellular Pools

“…Concentrations were generally higher in the upper part of the sediment, decreasing with depth, and higher during late autumn months, when chlorophylls and OM were also highest. EX nutrients concentration measured in Cadiz Bay sediments are similar to those in other muddy sediments from coastal areas, where a large temporal and spatial variability was also reported (Laima, 1992 ; Van Raaphorst and Malschaert, 1996 ). For example, Laima ( 1992 ) found higher following the phytoplankton sedimentation in Aarhus Bay (Denmark) with values up to 1400 nmol cm −3 at the sediment surface, similar to the ones measured here.…”

Nitrogen in Ancient Mud: A Biosignature?

“…This relationship applies over a wide range of NH 4 + concentrations, and it reproduces measured values in other settings ( e.g. , Rosenfeld, 1979; van Raaphorst and Malschaert, 1996). [It is preferred here over alternative formulations by Abdulgawad et al (2009) because the experiments by Boatman and Murray (1982) were carried out under more controlled conditions.]…”

Ammonium Adsorption by Surface Sediments in the Loughor Estuary, UK

“…Samples with a small mean particle size have a larger overall surface area per unit diameter and therefore will have a high ammonium adsorption coefficient. The present study shows that samples with a 65 µm grain size, had the highest ammonium adsorption coefficient when compared to the other samples with a larger mean grain size; this result agrees with the findings of Raaphorst and Malschaert (1996) [29].…”

“…Sediments at Site 1b were found to be higher in carbon content when compared to the sediment samples taken from Site 2. It was found that the organic carbon content had a significant effect on the ammonium adsorption and this result agreed well with previous studies, such as those of de Lange, (1992); and Raaphorst and Malschaert, (1996) [29], [30]. The samples from Site 1b were found to have higher ammonium adsorption values than those at Site 2.…”

Dynamics of Inorganic Nutrients in Intertidal Sediments: Porewater, Exchangeable, and Intracellular Pools

“…Concentrations were generally higher in the upper part of the sediment, decreasing with depth, and higher during late autumn months, when chlorophylls and OM were also highest. EX nutrients concentration measured in Cadiz Bay sediments are similar to those in other muddy sediments from coastal areas, where a large temporal and spatial variability was also reported (Laima, 1992 ; Van Raaphorst and Malschaert, 1996 ). For example, Laima ( 1992 ) found higher following the phytoplankton sedimentation in Aarhus Bay (Denmark) with values up to 1400 nmol cm −3 at the sediment surface, similar to the ones measured here.…”

Nitrogen in Ancient Mud: A Biosignature?

“…This relationship applies over a wide range of NH 4 + concentrations, and it reproduces measured values in other settings ( e.g. , Rosenfeld, 1979; van Raaphorst and Malschaert, 1996). [It is preferred here over alternative formulations by Abdulgawad et al (2009) because the experiments by Boatman and Murray (1982) were carried out under more controlled conditions.]…”