Beryllium-7 as a tracer to study mechanisms and rates of metal scavenging from lake surface waters

Article Article scientifique Article Beryllium-7 as a tracer to study mechanisms and rates of metal scavenging from lake surface waters eng 1999 author Steinmann Philipp 110514 author Billen Thomas 30100 author Loizeau Jean-Luc 0000-0002-0611-0388 23020 author Dominik Janusz 22088 1621-1633 10.1016/s0016-7037(99)00021-6 0016-7037 http://www.sciencedirect.com/science/article/pii/S0016703799000216 The removal of Be-7 from lake surface waters (Lake Lugano, Switzerland/Italy) was studied from September 1995 to May 1996. During this period the atmospheric input and sedimentary flux of Be-7, as well as concentrations of dissolved (<10 kD), colloidal (10 kD–1 mm), and particulate (>1 mm) Be-7 in the epilimnion were measured. The separation of dissolved, colloidal, and particulate fractions of Be-7 was carried out using continuous flow centrifugation (CFC) and tangential flow filtration (TFF) techniques. Lacustrine colloids (log Kc =6) were shown to be much more efficient sorbents for Be-7 than the suspended particles (log Kp 4–5). Particle concentrations Cp ranged from 0.5 to 2 mg/L. The ratio of colloid (>10 kD) to particle concentration Cc/Cp was close to 0.09 during winter months when detrital inputs are dominant, but was higher (0.16) in summer and in spring after an algal bloom. The Be-7 data were used to estimate coagulation rates of colloids. The highest coagulation rates (lambda coag = 0.4 d-1) along with the lowest Kc (log Kc = 5.2) were found after an algal bloom in spring. Surrogate Radioisotope Trace metal Dewey 550 41 Département F.-A. Forel des sciences de l'environnement et de l'eau 153 false Geochimica et cosmochimica acta 63 11/12 9871facf-f1a8-47e2-9baa-d10f72dac0cc Article (Published version) Restricted Steinmann et al 1999 Geochim Cosmochim Acta.pdf 241946 application/pdf restrictedAccess Faculté des sciences / Section des sciences de la Terre et de l'Environnement / Département F.-A. Forel des sciences de l'environnement et de l'eau

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Beryllium-7 as a tracer to study mechanisms and rates of metal scavenging from lake surface waters	Geochimica et cosmochimica acta			1999	679	2

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Billen, Thomas