Residence times of234Th and7Be in Lake Geneva

Dominik, Janusz; Schuler, Ch.; Santschi, Peter H.

doi:10.1016/0012-821x(89)90034-4

Cited by 45 publications

(22 citation statements)

References 19 publications

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“…Residence times of dissolved 7 Be and 210 Pb varied between 1 and 60 d (GM: 4.1 6 2.7 d, n 5 15) and between 2.9 and 52 d (GM: 9.0 6 2.1 d, n 5 15), respectively. Dissolved residence times were compared to (Benoit and Hemond 1987;Balistrieri et al 1995), whereas the values of t d Be were much shorter than those previously reported for freshwater systems: 36-1100 d (Dominik et al 1989;Schuler et al 1991;Steinmann et al 1999). Although the particle reactivity of Pb is higher than that of Be in freshwater systems (e.g., Olsen et al 1986;Benoit 1995 210 Pb from the resuspension of bottom sediments.…”

Section: Resultsmentioning

confidence: 93%

Short‐lived radionuclides (⁷Be and ²¹⁰Pb) as tracers of particle dynamics in a river system in southeast Michigan

Jweda

Baskaran

Hees

et al. 2008

Limnology & Oceanography

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Riverine water samples (dissolved and particulate), surficial bottom sediments, and trapped sediments were collected mostly monthly from three stations along the Clinton River, in southeastern Michigan, over a period of ,1 yr and analyzed for 7 Be and 210 Pb to elucidate the types and rates of processes affecting particle dynamics in a riverine system. Using a simple irreversible scavenging box model approach, sources and sinks for dissolved and particulate 7 Be and 210 Pb were quantified to estimate their residence times in the dissolved and particulate phases. Resuspension rates of surficial bottom sediments calculated from the mass balance of particulate 7 Be varied from 0.50 to 1.34 (geometric mean: 0.83 6 0.34) g cm 22 yr 21 , while corresponding values varied from 0.16 to 1.48 (GM: 0.38 6 0.38) g cm 22 yr 21 using particulate 210 Pb. Based on the 210 Pb mass balance, it appears that only ,2% of 210 Pb was derived from direct atmospheric deposition, while ,98% was derived from resuspension of bottom sediments. Additionally, there was a large discrepancy between mass flux collected in the trap (GM: 8.9 g cm 22 yr 21 ) compared to net sediment accumulation rates (GM: 0.88 6 0.38 g cm 22 yr 21 ), which was attributed to sediment resuspension; this may provide insight into the frequency of particle-recycling events. Furthermore, desorption of particle-reactive species during resuspension events could result in the mobility of contaminants to farther distances from the contaminated site. Therefore, this study has direct relevance to the uptake of particle-reactive species in a riverine system and thereby the water quality of rivers.

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Section: Resultsmentioning

confidence: 93%

Short‐lived radionuclides (⁷Be and ²¹⁰Pb) as tracers of particle dynamics in a river system in southeast Michigan

Jweda

Baskaran

Hees

et al. 2008

Limnology & Oceanography

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“…If sample volume is of no concern, then gamma counting is possible and in many ways preferable (Dominik et al 1989;Vogler et al 1996;Roberts and Santschi 2004). Sample preparation is relatively simple and non-destructive (Rutgers van der Loeff and Moore 1999).…”

Section: Freshwater Systemsmentioning

confidence: 99%

A review of present techniques and methodological advances in analyzing 234Th in aquatic systems

et al. 2006

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The short-lived thorium isotope 234 Th (half-life 24.1 days) has been used as a tracer for a variety of transport processes in aquatic systems. Its use as a tracer of oceanic export via sinking particles has stimulated a rapidly increasing number of studies that require analyses of 234 Th in both marine and freshwater systems. The original 234 Th method is labour intensive.Thus, there has been a quest for simpler techniques that require smaller sample volumes.Here, we review current methodologies in the collection and analysis of 234 Th from the water column, discuss their individual strengths and weaknesses, and provide an outlook on possible further improvements and future challenges. Also included in this review are recommendations on calibration procedures and the production of standard reference materials as well as a flow chart designed to help researchers find the most appropriate 234 Th analytical technique for a specific aquatic regime and known sampling constraints.

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“…Schuler et al, 1991;Robbins & Eadie, 1991;Dominik et al, 1989;Wan et al, 1987;Hawley et al, 1986). The trends in 'Be concentrations are opposite to those in 13'Cs.…”

Section: 'Cs Concentrationsmentioning

confidence: 71%

Identifying resuspended particles using isotope ratios

et al. 1994

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Three simple methods were developed to estimate the proportion of particles in lake water derived from resuspended material. These techniques use the different distributions of long and short-lived radioisotopes sorbed onto particles and were tested in the three basins of Lake Erie using 'Be, 13'Cs and 210Po/210Pb.While the concentration of 210Po on particles did not vary significantly in the lake, resuspended particles were characterized by high concentrations of 13'Cs and low concentrations of 7Be. The distribution of these radioisotopes is consistent with a simple mixing model in which the fraction of particles in the lake water derived from resuspension ranged from I 8 y0 to about 100 %. Higher concentrations of resuspended particles were found in deeper samples from the nepheloid layer and in the shallow western basin where thermal stratification was very weak.

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Residence times of234Th and7Be in Lake Geneva

Cited by 45 publications

References 19 publications

Short‐lived radionuclides (⁷Be and ²¹⁰Pb) as tracers of particle dynamics in a river system in southeast Michigan

Short‐lived radionuclides (⁷Be and ²¹⁰Pb) as tracers of particle dynamics in a river system in southeast Michigan

A review of present techniques and methodological advances in analyzing 234Th in aquatic systems

Identifying resuspended particles using isotope ratios

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Residence times of234Th and7Be in Lake Geneva

Cited by 45 publications

References 19 publications

Short‐lived radionuclides (7Be and 210Pb) as tracers of particle dynamics in a river system in southeast Michigan

Short‐lived radionuclides (7Be and 210Pb) as tracers of particle dynamics in a river system in southeast Michigan

A review of present techniques and methodological advances in analyzing 234Th in aquatic systems

Identifying resuspended particles using isotope ratios

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Short‐lived radionuclides (⁷Be and ²¹⁰Pb) as tracers of particle dynamics in a river system in southeast Michigan

Short‐lived radionuclides (⁷Be and ²¹⁰Pb) as tracers of particle dynamics in a river system in southeast Michigan