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• W2754334055 abstract "Cesium-137 is one of the most widely utilized anthropogenic radionuclides, both as a tracer and chronometer in the environment. Its application as an effective chronometer requires a thorough understanding of its geochemical behavior in aqueous systems. In this study, we collected and analyzed a suite of time-series water samples over a period of 8 months (April – November 2015), for particulate and dissolved 137Cs activities from a watershed in southeast Michigan, USA, using Cu2Fe(CN)6-coated cartridges developed to pre-concentrate dissolved 137Cs. We also conducted a series of laboratory experiments with the natural freshwater sediment samples and water with different chemical composition. There were seasonal variations of both particulate and dissolved 137Cs activities in the watersheds of Lake St. Clair. The distribution coefficients of 137Cs determined over a period of 8 months varied between 0.14 × 105 and 6.1 × 105 mL g−1 (mean: 2.9 × 105 mL g−1). The annual input and export flux of total 137Cs activity via rivers into and out of Lake St. Clair were calculated to be 3.6 × 1010 Bq and 1.6 × 1010 Bq, respectively. The amount of 137Cs derived by diffusion from interstitial pore water to the water column was estimated to be 0.30 × 1010 Bq (8.3% of the total input flux) which is similar to the percentage of 137Cs desorption (13%–20%) from sediment placed in oxic soft water system over a period of 30–106 days. For the same concentrations of NH4+, Mn2+, K+, Mg2+, Ca2+, Na+ and Sr2+ in a distilled water, our lab work showed that the sediment-sorbed 137Cs is displaced by ions in the order NH4+ > Mn2+ > K+ > Mg2+ ≈ Ca2+ > Na+ > Sr2+. In laboratory studies, 137Cs sorbed onto sediment was found to be less mobile in oxic soft water (Kd: 2.0 × 103 mL g−1) and more mobile in anoxic soft water (Kd: 0.2 × 103 mL g−1). In a hard water system, however, there is no significant difference in Kd values for both oxic and anoxic conditions. The sequence of Kd values is: oxic soft water > oxic hard water > anoxic hard water > anoxic soft water. The desorption experiments with 137Cs-sorbed sediments also confirmed that 137Cs is much more mobile in soft water than hard water. This mobility of 137Cs under oxic hard water system makes sedimentation rate estimation by 137Cs (based on the time the introduction of 137Cs) problematic in some soft water lakes, and estuarine and coastal waters." @default.
• W2754334055 created "2017-09-25" @default.
• W2754334055 creator A5014086731 @default.
• W2754334055 creator A5014664356 @default.
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• W2754334055 date "2017-12-01" @default.
• W2754334055 modified "2023-10-11" @default.
• W2754334055 title "Mobility of 137Cs in freshwater lakes: A mass balance and diffusion study of Lake St. Clair, Southeast Michigan, USA" @default.
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• W2754334055 doi "https://doi.org/10.1016/j.gca.2017.09.017" @default.
• W2754334055 hasPublicationYear "2017" @default.
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