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首页> 外文期刊>Environmental Science & Technology >Plutonium isotopes in settling particles: Transport and scavenging of Pu in the western Northwest Pacific
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Plutonium isotopes in settling particles: Transport and scavenging of Pu in the western Northwest Pacific

机译：沉降粒子中的同位素：西北太平洋西部的Pu的迁移和清除

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摘要

We examined the vertical distributions of Pu239+240 activity and Pu-240/Pu-239 atom ratio in settling particles and quantified the particulate Pu239+240 fluxes in the water column in the western Northwest Pacific. Settling particle samples were collected using sediment traps. Plutonium isotopes were analyzed using a sector field high-resolution ICP-MS. To the best of our knowledge, this is the first time that both Pu activity and Pu isotope ratio data have been obtained for settling particles in the Pacific Ocean. The high (> 0.18) Pu-240/Pu-239 atom ratios in settling particles indicate that plutonium from the Pacific Proving Grounds (PPG) source in the central Pacific is transported toward the western Northwest Pacific. Evidence indicates that Pu scavenging onto the settling particles is strongly dependent upon the bulk mass flux. The results suggest that advective lateral transport of dissolved Pu from the open ocean to the ocean margin and removal of Pu into the margin sediments by particle scavenging is a common phenomenon in the Pacific Ocean. Plutonium can be considered as a useful tracer to study the transport and fate of other contaminants that readily adsorb to particles in marine environments.
机译：我们研究了沉降颗粒中Pu239 + 240活性和Pu-240 / Pu-239原子比的垂直分布，并对西北太平洋西部水柱中的Pu239 + 240通量进行了定量分析。使用沉淀池收集沉降的颗粒样品。使用扇形场高分辨率ICP-MS分析同位素。据我们所知，这是首次获得用于沉积在太平洋中的粒子的Pu活度和Pu同位素比数据。沉降粒子中高的Pu-240 / Pu-239原子比（> 0.18）表明，来自中太平洋太平洋试验场（PPG）来源的p向西北太平洋西部输送。有证据表明，Pu在沉降颗粒上的清除作用很大程度上取决于总质量通量。结果表明，溶解性Pu从平洋向对流的平流侧向运移以及通过清除颗粒物将removal运入边缘沉积物中是普遍现象。 study可以被认为是研究海洋环境中容易吸附到颗粒的其他污染物的运移和归宿的有用示踪剂。

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