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Budgets and sources of dissolved platinum in the inland seas of Japan

机译：日本内陆海域溶解铂金的预算和来源

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摘要

Platinum (Pt) is used in a variety of industrial and medical applications, including automobile catalysis and anticancer drugs. At present, anthropogenic Pt is released and dispersed in the environment globally. Previously reported, vertical profiles of dissolved Pt in coastal seawaters indicated an increase in the Pt concentrations from the surface to the bottom, suggesting that Pt in seawater may be supplied from seafloor sediments, although this benthic supply process remains unresolved. Therefore, in this study, we sought to reveal the geochemical cycles of Pt between the seawater and sediments in inland seas, such as Japan?s Ariake Sea, which is a semi-enclosed sea, thus allowing the examination of the interactions between seawater, river water, and sediments. Seawater and sediment samples were collected from this sea and the nearby Tachibana Bay. The former was analyzed for relevant hydrographic properties (temperature, salinity, and dissolved oxygen) along with Pt concentration, while the latter underwent fractional dissolution to determine dissolved Pt using isotope-dilution inductively coupled plasma mass spectrometry (ID-ICP-MS) after column preconcentration with an anion exchange resin. The observed Pt concentrations in seawater ranged from 0.41 to 10.2 pmol/L with the highest value occurring at the deepest layer of the Ariake Sea?s mouth. The Pt concentrations increased with depth, with decreasing concentrations toward the inner central Ariake Sea. Detectable Pt contents in the sediment were found in the exchangeable, Fe and Mn oxide, and residual phases. Loosely adsorbed Pt onto the sediment might be desorbed by interactions with chloride in seawater. A model for the Pt budget in the Ariake Sea estimated that most Pt was supplied from sediments, and the Pt residence time was longer than that of seawater.
机译：铂（Pt）被用于各种工业和医疗应用，包括汽车催化和抗癌药使用。目前，人类铂被释放并分散在全球的环境。此前报道，在沿海海域溶解的Pt的垂直剖面表示的Pt浓度从表面至底部的增加，这表明了Pt在海水中可以从海底沉积物来提供，尽管这底栖供给过程仍然没有得到解决。因此，在这项研究中，我们试图揭示了海水和沉积物之间的内陆海铂的地球化学循环，如日本？的有明海，这是一个半封闭海，从而使海水之间的相互作用的研究，河水，和沉积物。海水和沉积物样本来自这片海域和附近的橘湾收集。前者分析用于与Pt浓度沿着相关水文性质（温度，盐度，和溶解的氧气），而后者后行分级溶解于柱后用同位素稀释电感耦合等离子体质谱法（ID-ICP-MS）确定溶解的Pt富集与阴离子交换树脂。在海水中的观察到的Pt浓度范围为0.41至10.2皮摩尔/ L与处出现明海？嘴的最深层的最高值。将Pt浓度随深度的增加，随浓度朝向内中央明海。在沉积物可检测的Pt含量在可更换，Fe和Mn的氧化物，和残余相被发现了。松散地吸附到铂沉积物可能通过与氯在海水的相互作用被解吸。一种在有明海铂预算模型估计大部分的Pt沉积物供给，铂停留时间比海水更长时间。

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