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Factor Analysis Reveals Effects of Reducing Conditions on the Fate and Transport of RDX in Groundwater

机译:因子分析揭示了还原条件对RDX在地下水中的结局和运移的影响

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Groundwater investigations conducted at the Massachusetts Military Reservation (MMR) show the impact of historic activities on the development of groundwater contaminant plumes emanating from military ranges. Several of the plumes, located on the southeastern side of the reservation, contain elevated concentrations of hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX). In most cases, these plumes show continuity from the source to the leading edge, indicating that very little attenuation of RDX is occurring in the aquifer. Interesting exceptions to this trend are locations where plumes consisting of RDX and perchlorate intercept part of the aquifer that was previously impacted by a fuel spill; reducing conditions due to biological activity resulted from this spill. RDX concentrations show a significant positive correlation with both dissolved oxygen and oxidation-reduction potential, and a significant negative correlation with specific conductivity. The distribution of RDX is more consistent upgradient from the oxygen depleted zone and implies that RDX is degrading in the aquifer near the fuel spill. A factor analysis yielded two geochemical (44 percent variability explained) and two contaminant (30 percent variability explained) factors. This suggests that the geochemical nature of the aquifer is the primary source of groundwater parameter variability determined by this investigation.
机译:在马萨诸塞州军事保留区(MMR)进行的地下水调查显示,历史活动对从军事范围散发出来的地下水污染物羽流的发展具有影响。位于保护区东南侧的若干羽烟中含有较高浓度的六氢-1,3,5-三硝基-1,3,5-三嗪(RDX)。在大多数情况下,这些羽流显示出从源头到前沿的连续性,表明在含水层中RDX衰减很小。这种趋势有趣的例外情况是,由RDX和高氯酸盐组成的烟流截取了先前受燃料泄漏影响的含水层的一部分;泄漏造成的生物活性降低了状况。 RDX浓度与溶解氧和氧化还原电位均呈显着正相关,与比电导率呈显着负相关。 RDX的分布从缺氧区开始更一致地向上升级,这意味着RDX在燃料泄漏附近的含水层中正在降解。因子分析得出两个地球化学因子(解释了44%的变异性)和两个污染物因子(解释了30%的变异性)。这表明该含水层的地球化学性质是该调查确定的地下水参数变化的主要来源。

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