Measuring bismuth‐210, its parent, and daughter in aquatic systems
Measuring bismuth‐210, its parent, and daughter in aquatic systems
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DOI：
10.1002/lom3.10352
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发表时间：
2020-02
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通讯作者：
J. Waples
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作者：
J. Waples
210 Bi（t1/2：5.01 d）-210 Pb的子体和210 Po的母体-很少在水生系统中测量，并且对其在水柱中的行为知之甚少。本文提出了一种快速测定水产样品中~（210）Pb、~（210）Bi和~（210）Po的方法，方法是：（1）样品预处理后15 min内，将~（210）Bi和~（210）Po清除到阴离子固相萃取盘上，（2）随后立即在盘上计数~（210）Bi的β衰变;（3）随后从圆盘上取下210 Po，并重新沉积在铜板上进行α光谱分析;（4）通过210 Bi的向内生长测定210 Pb。我提出衰变校正计算的总，溶解，和粒子结合的分数的每种核素，并得出结论，210铅，210铋，和210 Po的活动在雨，dreissenid（斑驴）贻贝，和水样中的密歇根湖的密尔沃基内港的分析。结果表明，阴离子固相萃取盘上铅的损失可忽略不计（0.2% ± 2.1%; ± 1 SD，n = 4），铋的吸附完全（99% ± 2%; ± 1 SD，n = 16）。湖水中~（210）Pb测定的相对平均绝对偏差为2.4% ± 1.9（总样品放射性的几何平均值：3.0次衰变/分钟[dpm]，n = 6），210 Bi为7.7% ± 5.8%（总样品活性的几何平均值：2.6 dpm，n = 8），210 Po为2.7% ± 1.7%（总样品活性的几何平均值：1.4 dpm，n = 8）。
210Bi (t1/2: 5.01 d)—the daughter of 210Pb and parent of 210Po—has rarely been measured in aquatic systems, and its behavior in the water column is poorly understood. In this article, I present a method for quickly measuring 210Pb, 210Bi, and 210Po in aquatic samples, where (1) 210Bi and 210Po are scavenged onto an anion solid‐phase extraction disk within 15 min of pretreating the sample; (2) beta decay of 210Bi is counted on the disk immediately thereafter; (3) 210Po is subsequently removed from the disk and redeposited on a copper plate for α‐spectroscopy; and (4) 210Pb is determined via the ingrowth of 210Bi. I present decay‐corrected calculations for total, dissolved, and particle‐bound fractions of each nuclide and conclude with an analysis of 210Pb, 210Bi, and 210Po activities in rain, dreissenid (quagga) mussels, and water samples from the Milwaukee Inner Harbor in Lake Michigan. Results show that the loss of lead on the anion solid‐phase extraction disks was negligible (0.2% ± 2.1%; ± 1 SD, n = 4), and the sorption of bismuth was complete (99% ± 2%; ± 1 SD, n = 16). Relative mean absolute deviations of duplicate sample analyses of lake water were 2.4% ± 1.9% for 210Pb (geometric mean of total sample activity: 3.0 disintegrations per minute [dpm], n = 6), 7.7% ± 5.8% for 210Bi (geometric mean of total sample activity: 2.6 dpm, n = 8), and 2.7% ± 1.7% for 210Po (geometric mean of total sample activity: 1.4 dpm, n = 8).