Surface riverine sediment samples were collected along the course of the River Medway, UK, between Yalding and the mouth of the estuary at 40 different sites. The samples were then analysed for hexabromocyclododecane (HBCDD) concentrations using a liquid chromatography system coupled to a high-resolution, accurate mass Orbitrap™ mass spectrometer. After normalisation to the sediment organic carbon (OC) content, average ΣHBCDD was 270 ng g⁻¹ OC with a maximum concentration of 1006 ng g⁻¹ OC. Spatial trend analysis revealed that industrial and residential land uses have significantly influenced HBCDD concentrations and profiles in riverine sediments. Higher concentrations of ΣHBCDD were found in sites near construction and maritime port locations, and these included freight ports, new builds and demolition sites. The HBCDD isomer profile reflected that of the commercial mixture with a comparatively high γ-HBCDD to α-HBCDD and β-HBCDD. The isomer profiles of sites located near construction activities indicate recent pollution events, with increased γ-HBCDD and decreased α-HBCDD compared to the study area's average profile. HBCDD isomer concentrations also indicated that the non-tidal portions of the river caused by locks showed a profile that was typical of older HBCDD contamination, indicating a possible sediment and HBCDD trap.

中文翻译：

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探索英国梅德韦河沿河沉积物中六溴环十二烷的浓度变化

沿英国梅德韦河沿途在亚丁和河口之间的40个不同地点收集了地表河流沉积物样本。然后，使用与高分辨率，精确质量的Orbitrap™质谱仪耦合的液相色谱系统分析样品中的六溴环十二烷（HBCDD）浓度。对沉积物有机碳（OC）含量进行归一化后，平均ΣHBCDD为270 ng g ^-1 OC，最大浓度为1006 ng g ^-1OC。空间趋势分析表明，工业和住宅用地已严重影响河流沉积物中六溴环十二烷的浓度和剖面。在建筑和海运港口附近的地点发现了较高浓度的ΣHBCDD，其中包括货运港口，新建和拆迁地点。HBCDD异构体的分布反映了具有相对较高的γ-HBCDD到α-HBCDD和β-HBCDD的市售混合物的分布。与研究区的平均分布图相比，靠近建筑活动场所的异构体图表明最近发生了污染事件，γ-六溴环十二烷增加，而α-六溴环十二烷减少。HBCDD异构体的浓度还表明，由闸门引起的河流非潮汐部分显示出较老的HBCDD污染典型的剖面，