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Behavior of platinum during estuarine mixing (Pontevedra Ria, NW Iberian Peninsula)

机译：河口混合过程中铂的行为（Pontevedra Ria，西北伊比利亚半岛）

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摘要

The concentrations of Pt in sediments, water and suspended paniculate matter (SPM) were determined in the Lerez River estuary (Pontevedra Ria, NW Iberian Peninsula) on two sampling dates in 2008 and 2011, by means of catalytic adsorptive stripping voltammetry. Average concentrations in sediments (1.2 ± 0.5 ng g~(-1); n = 13) corresponded to an enrichment factor of 2-4 compared to background values, and were in the range of those found in the SPM during the 2011 sampling (2.1 ± 2.4 ng g~(-1); n = 15), but significantly lower than those in 2008 SPM (8.0 ±4.4 ng g~(-1); n = 15). Higher dissolved Pt concentrations were also found in 2008 (0.21 and 0.62 pM in the freshwater and seawater end-member) compared to the 2011 campaign (0.03 - freshwater and 0.40 pM - seawater end-member). Concentrations in the seawater end-members exceed those of typical North Atlantic waters, suggesting inputs of this element within the estuary. The extremely low value for the freshwater end-member in 2011 appears to be among the lowest Pt concentrations ever reported in the literature. Non-conservative behavior of Pt during estuarine mixing was observed on both sampling dates. Particle-water distribution coefficients (K_D) show a decrease with salinity, in agreement with speciation calculations, which predict a transfer from neutral Pt(II) (as Pt(OH)_2) in freshwater to negatively charged Pt(IV) (as PtCl_5(OH)~(2-)) species in seawater. Such behavior during estuarine mixing can play an important role in Pt mobilization from contaminated particles discharged into estuaries and coasts.
机译：通过催化吸附溶出伏安法，分别在2008年和2011年的两个采样日期，在勒雷斯河河口（蓬特维德拉里亚，西北伊比利亚半岛）确定了沉积物，水和悬浮颗粒物（SPM）中的Pt浓度。与背景值相比，沉积物中的平均浓度（1.2±0.5 ng g〜（-1）； n = 13）对应于2-4的富集系数，并且在SPM于2011年采样期间发现的浓度范围内（ 2.1±2.4 ng g〜（-1）; n = 15），但明显低于2008 SPM的数值（8.0±4.4 ng g〜（-1）; n = 15）。与2011年的活动（0.03-淡水和0.40 pM-海水末端成员）相比，2008年的溶解Pt浓度也更高（淡水和海水末端成员为0.21和0.62 pM）。海水最终成员中的浓度超过了典型北大西洋水域的浓度，表明该元素在河口内的输入。 2011年淡水终端成员的极低价值似乎是文献中报道的最低Pt浓度之一。在两个采样日期都观察到在河口混合过程中Pt的非保守行为。颗粒水分布系数（K_D）显示出盐度的降低，这与物种形成计算一致，后者预测了淡水中的中性Pt（II）（如Pt（OH）_2）向带负电的Pt（IV）（如PtCl_5）的转移海水中的（OH）〜（2-））种类。河口混合过程中的这种行为在Pt的动员中起着重要作用，Pt从排入河口和海岸的污染颗粒中迁移出来。

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