Dispersal and accumulation of Pt, Pd and Rh derived from a roundabout in Sheffield (UK): From stream to tidal estuary.
Dispersal and accumulation of Pt, Pd and Rh derived from a roundabout in Sheffield (UK): From stream to tidal estuary.
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DOI：
10.1016/j.scitotenv.2008.03.037
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发表时间：
2008-08
期刊：
影响因子：
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通讯作者：
H. Prichard;Matthew T. Jackson;J. Sampson
中科院分区：
文献类型：
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作者：
H. Prichard;Matthew T. Jackson;J. Sampson
Coisley Hill 环岛是溪流沉积物中 PGE 的典型城市来源，道路灰尘中的 Pt 含量异常高，高达 408 ppb、Pd 444 ppb 和 Rh 113 ppb，沟渠沉积物中的 Pt 含量高达 416 ppb 和 Pd 278 ppb，边缘土壤中的 Pt 含量高达 606 ppb 和 1050 ppb Pd。对于同时收集的样品，道路灰尘值远高于排出环岛的 Shire Brook 河流沉积物中的灰尘值，其值为 3–64 ppb Pt、4–57 ppb Pd 和高达 7 ppb Rh。 Rother 河和 Don 河下游沉积物的 Pt 含量较低，为 2–35 ppb，Pd 含量为 2–14 ppb，Rh 含量高达 3 ppb。亨伯河口的铂含量较低，为 6–8 ppb、Pd 5–8 ppb 和 Rh 1–2 ppb。 Pt/Pd 增加了 Coisley Hill 0.8、Shire Brook 1.0、Trent 和 Don 1.5 以及 Humber estuary 2.0 的流域。 Pt/Rh 和 Pd/Rh 也在下游增加。贵金属通常远离其车辆催化源而分散，并且 Pd 的分散程度高于 Pt 和 Rh，但 Pt 和 Pd 在 Shire Brook 的酸性矿井排水中重新富集，其浓度随水流流量而变化。 Pt 和 Pd 值在潮汐极限和河流泛滥时沉积的泥浆中略有升高。在 Coisley Hill，新路面（采样时两周前）的灰尘中含有 133 ppb Pt 和 230 ppb Pd 值。这些与更古老的路面上的相似，表明 Pt 和 Pd 从道路上快速聚集和分散。道路灰尘中的金含量较低，而大都市中的金含量较高，表明城市地区比农村地区存在更多的金来源。 Au 值在下游的稀释程度不如 PGE，表明分散和沉降过程不同。
The Coisley Hill roundabout, a typical urban source for PGE in stream sediments, has anomalously high values of up to 408 ppb Pt, 444 ppb Pd and 113 ppb Rh in road dust, up to 416 ppb Pt and 278 ppb Pd in gulley sediment and up to 606 ppb Pt and 1050 ppb Pd in verge soil. For samples collected at the same time, the road dust values are much higher than in sediments in the Shire Brook stream, that drains the roundabout, with values of 3–64 ppb Pt, 4–57 ppb Pd and up to 7 ppb Rh. Downstream sediments from rivers Rother and Don have lower values of 2–35 ppb Pt, 2–14 ppb Pd and up to 3 ppb Rh. The Humber estuary values are low with 6–8 ppb Pt, 5–8 ppb Pd and 1–2 ppb Rh. Pt/Pd increases down catchment with Coisley Hill 0.8, Shire Brook 1.0, Trent and Don 1.5 and the Humber estuary 2.0. Pt/Rh and Pd/Rh also increase downstream. Precious metals are generally dispersed away from their vehicle catalytic source and Pd is dispersed more than Pt and Rh but Pt and Pd are re-concentrated in acid mine drainage in the Shire Brook, with concentrations varying with stream flow. Pt and Pd values are slightly elevated at the tidal limit and in mud deposited when the river is in spate. On Coisley Hill, values of 133 ppb Pt and 230 ppb Pd occur in dust from a new road surface (two weeks old when sampled). These are similar to those on much older road surfaces suggesting that Pt and Pd collect and disperse rapidly from roads. Au is low in road dust and higher values in conurbations suggest the presence of more Au sources in urban rather than in rural areas. Au values are not diluted downstream as much as PGE suggesting different processes of dispersion and sedimentation.