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of 24.1 days) allows liquid scintillation counting of its /3-decay at low molar concentra-tions (detection limit of 10-17 M). Consequently, in these experiments, the partitioning of 234 Th among the dissolved, colloidal, and particulate fractions could be measured in reasonable sample volumes (100 ml aliquots from 2 1 bottles) without increasing the natural concentration of Th (10 -15m 234 Th spikes were added to ultrafiltered coastal seawater with a 232Th concentration of approximately 10-13M). Experiments were carried out under constant natural conditions of pH, salinity, and temperature; and variable concentrations of dissolved organic matter (DOM), colloidal, and particulate matter. Two liter polyethylene bottles were acid cleaned and soaked with ultrafiltered, photo-oxidized seawater for one week prior to use. Replicate bottles were then filled with fresh ultrafiltered seawater (with known DOM concentration) and colloidal and/or particulate matter was added from stock suspensions. Suspensions were equilibrated for 24 hours at 4°C before being spiked with 234Th tracer. Acid stabilized Th stock solution (100 pl) was added to give initial sample activities of 2-4x 104dpm
DOI link for of 24.1 days) allows liquid scintillation counting of its /3-decay at low molar concentra-tions (detection limit of 10-17 M). Consequently, in these experiments, the partitioning of 234 Th among the dissolved, colloidal, and particulate fractions could be measured in reasonable sample volumes (100 ml aliquots from 2 1 bottles) without increasing the natural concentration of Th (10 -15m 234 Th spikes were added to ultrafiltered coastal seawater with a 232Th concentration of approximately 10-13M). Experiments were carried out under constant natural conditions of pH, salinity, and temperature; and variable concentrations of dissolved organic matter (DOM), colloidal, and particulate matter. Two liter polyethylene bottles were acid cleaned and soaked with ultrafiltered, photo-oxidized seawater for one week prior to use. Replicate bottles were then filled with fresh ultrafiltered seawater (with known DOM concentration) and colloidal and/or particulate matter was added from stock suspensions. Suspensions were equilibrated for 24 hours at 4°C before being spiked with 234Th tracer. Acid stabilized Th stock solution (100 pl) was added to give initial sample activities of 2-4x 104dpm
of 24.1 days) allows liquid scintillation counting of its /3-decay at low molar concentra-tions (detection limit of 10-17 M). Consequently, in these experiments, the partitioning of 234 Th among the dissolved, colloidal, and particulate fractions could be measured in reasonable sample volumes (100 ml aliquots from 2 1 bottles) without increasing the natural concentration of Th (10 -15m 234 Th spikes were added to ultrafiltered coastal seawater with a 232Th concentration of approximately 10-13M). Experiments were carried out under constant natural conditions of pH, salinity, and temperature; and variable concentrations of dissolved organic matter (DOM), colloidal, and particulate matter. Two liter polyethylene bottles were acid cleaned and soaked with ultrafiltered, photo-oxidized seawater for one week prior to use. Replicate bottles were then filled with fresh ultrafiltered seawater (with known DOM concentration) and colloidal and/or particulate matter was added from stock suspensions. Suspensions were equilibrated for 24 hours at 4°C before being spiked with 234Th tracer. Acid stabilized Th stock solution (100 pl) was added to give initial sample activities of 2-4x 104dpm
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