Dissolved platinum in rainwater, river water and seawater around Tokyo Bay and Otsuchi Bay in Japan.
Dissolved platinum in rainwater, river water and seawater around Tokyo Bay and Otsuchi Bay in Japan.
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日本东京湾和大槌湾周围的雨水、河水和海水中溶解的铂。
DOI：
10.1016/j.ecss.2016.07.002
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
and T. Gamo
中科院分区：
文献类型：
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作者：
A.S. Mashio;H. Obata;H. Tazoe;M. Tsutsumi;A. Ferrer i Santos;and T. Gamo
铂是地壳中最稀有的元素之一，现在广泛用于汽车催化转换器和抗癌药物等各种产品。因此，城市水环境中铂的浓度可能会增加。然而，由于铂在水环境中的总体浓度仍然很低，因此对铂在水环境中的分布和地球化学循环知之甚少。在这项研究中，我们研究了溶解在河水和东京湾和大槌湾（岩手县，日本）周围的海水和雨水在东京地区的Pt。为了确定亚皮摩尔水平的溶解铂，我们使用同位素稀释电感耦合等离子体质谱法（ICP-MS）柱预浓缩后，与阴离子交换树脂。2002年，我们观察到东京雨水中溶解的Pt浓度的季节性变化，1月至3月的浓度较高，这可能与雨水的pH值。在大东京地区的荒川河的源头，溶解的Pt浓度被发现是类似的雨水。进一步下游，溶解铂浓度急剧增加，这似乎反映了人类活动的输入到河流中的铂。在日本的农村地区（大槌湾），溶解的铂浓度低于东京湾。在这一地区，溶解的Pt浓度急剧增加，观察到在高盐度区。对比城市和农村地区之间的铂分布模式表明，强人为铂源存在于城市河口和河口内的地球化学过程影响铂的分布。
Platinum, among the rarest elements in the earth's crust, is now widely used in various products such as catalytic converters in automobiles and anticancer drugs. Consequently, the concentration of Pt in urban aquatic environments might be increasing. However, little is known about the distributions and geochemical cycles of Pt in aquatic environments because its overall concentration remains low. In this study, we examined dissolved Pt in river water and seawater around Tokyo Bay and Otsuchi Bay (Iwate Prefecture, Japan) and rainwater in the Tokyo area. To determine sub-picomolar levels of dissolved Pt, we used isotope-dilution Inductively Coupled Plasma Mass Spectrometry (ICP-MS) after column preconcentration with an anion exchange resin. We observed seasonal variation in the dissolved Pt concentrations in Tokyo rainwater in 2002; higher concentrations were found from January to March, which might be related to the pH of rainwaters. At the source of the Arakawa River in the greater Tokyo area, the dissolved Pt concentration was found to be similar to that in rainwater. Further downstream, the dissolved Pt concentration increased sharply, which seemingly reflects the anthropogenic input of Pt into the river. In a rural area in Japan (Otsuchi Bay), the dissolved Pt concentrations were lower than in Tokyo Bay. In this area, a sharp increase in dissolved Pt concentrations was observed in a high salinity region. Contrasting Pt distribution patterns between urban and rural areas indicate that strong anthropogenic Pt sources exist in urban estuaries and that geochemical processes within estuaries affect the Pt distribution.