加拿大新斯科舍省Montague和Goldenville金矿区森林土壤地球化学基线的建立及其环境风险评价

IF 1.2 4区 地球科学 Q2 GEOLOGY
M. Parsons, M. Little
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引用次数: 2

摘要

加拿大新斯科舍省历史黄金地区的矿山尾矿含有高浓度的砷(As)和汞(Hg),可能对生态系统和人类健康构成风险。蒙塔古(Montague)和戈尔登维尔(Goldenville)这两个地点尤其令人担忧,因为尾矿靠近居民区,偶尔会被用于越野车比赛。风险评估计算需要了解这些金矿区内矿化基岩上的土壤中砷和汞的自然浓度。在这项研究中,我们从Montague附近的46个地点和Goldenville附近的39个地点收集了表层土壤顶部0-5 cm(公共卫生层)的样本。选取不同土壤层(H、Ae、B、C),评价土壤剖面中元素的垂直分布。结果表明,两区矿化带各土层As和Hg含量总体上在东南方向冰下较高,反映了冰川侵蚀和矿化基岩的搬运作用。对表层0-5 cm土壤的分析显示,砷和汞浓度(<2 mm粒径部分)的范围如下:蒙塔古:砷,4-273 mg/kg(中位数42 mg/kg);Hg, 72-490µg/kg(中位数164µg/kg);Goldenville: As, 2-140 mg/kg(中位数13 mg/kg);Hg, 39-312µg/kg(中位数114µg/kg)。总的来说,砷在B层和C层的浓度最高,而汞在腐殖质(H)层的浓度最高。本研究的结果已用于评估这些地点的尾矿分布,并有助于指导风险管理决策。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Establishing geochemical baselines in forest soils for environmental risk assessment in the Montague and Goldenville gold districts, Nova Scotia, Canada
Mine tailings at historical gold districts in Nova Scotia, Canada, contain high concentrations of arsenic (As) and mercury (Hg), which may represent a risk to ecosystems and human health. Two sites, Montague and Goldenville, are of particular concern as tailings are located close to residences and are occasionally used for racing off-road vehicles. Risk-assessment calculations require knowledge of the naturally occurring concentrations of As and Hg in soils overlying mineralized bedrock within these gold districts. In this study, we collected samples of the top 0–5 cm of surface soil (the Public Health layer) from 46 sites near Montague, and 39 sites near Goldenville. Samples of individual soil horizons (H, Ae, B, and C) were also taken from selected sites to evaluate the vertical distribution of elements in the soil profile. Results show that the concentrations of As and Hg in all soil horizons are generally higher down-ice, southeasterly, of the ore zones in both districts, reflecting glacial erosion and transport of mineralized bedrock. Analysis of the top 0–5 cm of soils shows the following ranges in As and Hg concentrations (<2 mm size fraction): Montague: As, 4–273 mg/kg (median 42 mg/kg); Hg, 72–490 µg/kg (median 164 µg/kg); Goldenville: As, 2–140 mg/kg (median 13 mg/kg); Hg, 39–312 µg/kg (median 114 µg/kg). In general, the concentrations of As are highest in the B and C horizons, whereas Hg concentrations are highest in humus (H). Results from this study have been used to assess the distribution of tailings at these sites, and to help guide risk-management decisions.
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来源期刊
Atlantic Geology
Atlantic Geology GEOLOGY-
CiteScore
2.10
自引率
18.80%
发文量
0
审稿时长
>12 weeks
期刊介绍: Atlantic Geology (originally Maritime Sediments, subsequently Maritime Sediments and Atlantic Geology) covers all aspects of the geology of the North Atlantic region. It publishes papers, notes, and discussions on original research and review papers, where appropriate to the regional geology.
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