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首页> 外文期刊>Journal of oceanography >Anthropogenic Pb in Settling Particulate Matter in the Northwestern Pacific Examined Using Stable Isotopes of Pb
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Anthropogenic Pb in Settling Particulate Matter in the Northwestern Pacific Examined Using Stable Isotopes of Pb

机译：用稳定的铅同位素检查了西北太平洋人为沉积的微粒物质

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We have investigated Pb concentrations and isotopic compositions in settling particles collected by sediment traps experiments over a period of two years, from May 2005 to April 2007, at two depths, 770 and 5100 m, at station KNOT in the Northwestern Pacific Ocean (44°N, 155°E). To the identify provenances of Pb, the samples were separated into two fractions by chemical leaching techniques, with the leachate expected to contain Pb of anthropogenic origin. Isotopic compositions of Pb and concentrations of Pb, Sc, Mn, La, Yb, and Th were measured by quadrupole ICP-MS. The isotope ratios of leachable Pb in settling particles were ~(207)Pb/~(206)Pb = 0.860 ± 0.001; ~(208)Pb/~(208)Pb = 2.116 ±0.002 (mean ±95% confidence intervals), which are similar to those of aerosols in China that are greatly affected by pollution from coal combustion. We estimated the mean contribution from anthropogenic Pb sources to the Pb in settling particles, using the conventional binary (anthropogenic and natural Pb) mixing equation for Pb isotopes, as 90% in the upper trap and 78% in the lower trap. Furthermore, we found a significant negative correlation between the isotope ratios of Pb and concentrations of leachable Mn, normalized to those of leachable Pb, suggesting that manganese oxides play an important role in transporting Pb from the upper layers of the ocean to the deeper layers. Our results support the speculation published in a previous study that Pb might be scavenged by Mn oxides in the Northwestern Pacific Ocean.
机译：我们已经调查了沉积物陷阱实验在2005年5月至2007年4月的两年中在西北太平洋KNOT站两个深度770和5100 m（44° N，155°E）。为了鉴定Pb的来源，通过化学浸出技术将样品分为两部分，浸出液预计包含人为来源的Pb。通过四极杆ICP-MS测量Pb的同位素组成和Pb，Sc，Mn，La，Yb和Th的浓度。沉降颗粒中可浸出铅的同位素比为〜（207）Pb /〜（206）Pb = 0.860±0.001； 〜（208）Pb /〜（208）Pb = 2.116±0.002（平均±95％置信区间），与中国受煤炭燃烧污染影响较大的气溶胶相似。我们使用铅同位素的传统二元（人为和天然铅）混合方程估算了人为沉积铅源对沉降颗粒中铅的平均贡献，上层阱为90％，下层阱为78％。此外，我们发现铅的同位素比与可浸出的锰的浓度之间存在显着的负相关关系，并与可浸出的铅进行了归一化，这表明锰氧化物在将铅从海洋上层输送到更深层中起着重要作用。我们的结果支持先前研究中发表的推测，即西北太平洋的Mn氧化物可能会清除Pb。

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