Bismuth-210, its parent, and daughter and their use as particle tracers in aquatic systems
Bismuth-210, its parent, and daughter and their use as particle tracers in aquatic systems
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Bismuth-210、其母体和子体以及它们在水生系统中作为粒子示踪剂的用途
DOI:
10.1016/j.marchem.2021.104072
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发表时间:
2022
期刊:
影响因子:
3
通讯作者:
Waples, James T.
中科院分区:
文献类型:
--
作者:
Waples, James T.
Disequilibrium between210Pb (t½: 22.3 years) and its granddaughter210Po (t½: 138.4 days) has been used to infer organic particle removal rates from the surface ocean on a timescale of weeks to months; however, the behavior of the short-lived intermediary daughter210Bi (t½: 5.01 days) is not well known. Here, timeseries measurements of210Pb,210Bi, and210Po in the Milwaukee Inner Harbor on Lake Michigan showed respective particle distribution (Kd) coefficients of 7.1 (± 0.4) × 105, 9.3 (± 1.7) × 105, and 10.2 (± 0.6) × 105L kg−1, givingKdratios, or fractionation factors (F), ofFBi/Pb= 1.3 ± 0.3,FPo/Bi= 1.1 ± 0.2, andFPo/Pbof 1.4 ± 0.1. After a large rain event, total210Pb,210Bi, and210Po activities in the harbor water column decreased over a course of 12 days from 347 to 105 dpm210Pb m−3, 397 to 88 dpm210Bi m−3, and 144 to 58 dpm210Po m−3. This is the first observation of a total210Bi/210Po activity ratio of <1 in an aquatic system. A 1-D non-steady-state model of nuclide fluxes suggested that 92% of the reduction in210Bi activity was due to removal from the water column, with the remainder accounted for by net in situ decay. The potential for using210Bi as a tracer of high and variable particle scavenging rates in lakes and shallow marine systems is supported.
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