Interactions of thorium isotopes with colloidal organic matter in oceanic environments Academic Article

abstract

• The phase speciation of thorium and consequences for the residence times of colloids are examined in seawater of the Middle Atlantic Bight (MAB) and the Gulf of Mexico. Two fractions of colloidal organic matter (COM) were sampled using cross-flow ultrafiltration techniques and measured for their 234Th activity and organic carbon concentration. The ratios of mass concentrations of COM to those of suspended particulate matter were as high as 10 in the MAB and 6-34 in the Gulf of Mexico. The discrepancy between apparent turnover times of colloids derived from Th scavenging and 14C measurements suggest that 234Th and 14C may trace different geochemical pathways of colloids in the ocean.

authors

• Santschi, Peter

published proceedings

• COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS

author list (cited authors)

• Guo, L. D., Santschi, P. H., & Baskaran, M.

citation count

• 64

complete list of authors

• Guo, LD||Santschi, PH||Baskaran, M

publication date

• February 1997

publisher

• Elsevier  Publisher

keywords

• Dissolved Organic Carbon
• Marine Colloids
• Residence Times
• Seawater
• Thorium Isotopes
• Ultrafiltration

Digital Object Identifier (DOI)

• 10.1016/S0927-7757(96)03723-5

start page

• 255

end page

• 271

volume

• 120

issue

• 1-3

URL

• http://dx.doi.org/10.1016/s0927-7757(96)03723-5

user-defined tag

• 14 Life Below Water