Legacy Lead from Past Mining Activity and Gasoline Additives: Evidence from Lead Isotopes and Trace Element Geochemical Studies in the White River Basin, Southern Ozark Region, USA
Legacy Lead from Past Mining Activity and Gasoline Additives: Evidence from Lead Isotopes and Trace Element Geochemical Studies in the White River Basin, Southern Ozark Region, USA
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过去采矿活动和汽油添加剂遗留下来的铅：来自美国南奥扎克地区怀特河流域的铅同位素和微量元素地球化学研究的证据
DOI：
10.3390/geosciences8060189
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发表时间：
2018
影响因子：
2.8
通讯作者：
John R. Samuelsen
中科院分区：
文献类型：
--
作者：
Adriana Potra;L. Ruhl;John R. Samuelsen
铅同位素组成和铅，铜，锌，和流沉积物中的渗滤液中的浓度在怀特河盆地，欧扎克地区南部，已被确定区分自然和人为来源的铅和评估的金属负载，由流排水的密西西比河谷型（MVT）锌铅矿山在北方阿肯色州区。在下游和最靠近矿井的地方收集的样本的微量元素浓度远高于阿肯色州土壤中的微量元素浓度。在矿场上游采集的样本中，微量元素浓度较低。大多数分析样品的痕量金属浓度高于美国环境保护署（USEPA）沉积物质量准则阈值效应水平。下游样品和MVT矿石的Pb同位素值相似，表明Pb来源相似。上游样品的铅同位素值是相似的，从欧扎克高原的土壤所定义的，这表明铅从历史上的采矿并不占主导地位的上游沉积物。然而，通过渗滤液数据的线性回归线表明，含铅汽油和矿石代表的两个端元之间的混合可以产生的铅同位素比，注意到在上游渗滤液。
Lead isotope compositions and Pb, Cu, Zn, and As concentrations in stream sediment leachates in the White River Basin, southern Ozark Region, have been determined to discriminate between natural and anthropogenic sources of Pb and to assess the metal loads that are transported by streams draining the Mississippi Valley-type (MVT) Zn-Pb mines in the Northern Arkansas district. The samples that were collected downstream of and closest to the mines have trace element concentrations well above those in soils from Arkansas. The trace element concentrations are lower in samples that were collected upstream of the mines. Most of the analyzed samples have trace metal concentrations above the United States Environmental Protection Agency (USEPA) Sediment Quality Guidelines Threshold Effects Level. The Pb isotope values of the downstream samples and the MVT ores are similar, suggesting a similar Pb source. The Pb isotope values of the upstream samples are similar to those that were defined by soils from the Ozark Plateau, suggesting that Pb from historic mining does not dominate upstream sediments. However, a linear regression line through the leachate data indicates that mixing between two end-members represented by leaded gasoline and ores could generate the Pb isotope ratios that were noticed in the upstream leachates.