Evidence of Coupled Carbon and Iron Cycling at a Hydrocarbon-Contaminated Site from Time Lapse Magnetic Susceptibility,Environmental Science & Technology

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Evidence of Coupled Carbon and Iron Cycling at a Hydrocarbon-Contaminated Site from Time Lapse Magnetic Susceptibility
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2017-09-21 00:00:00 , DOI: 10.1021/acs.est.7b02155
Anders L. Lund _{1,

2} , Lee D. Slater ₁ , Estella A. Atekwana ₃ , Dimitrios Ntarlagiannis ₁ , Isabelle Cozzarelli ₄ , Barbara A. Bekins ₅

Affiliation

Conventional characterization and monitoring of hydrocarbon (HC) pollution is often expensive and time-consuming. Magnetic susceptibility (MS) has been proposed as an inexpensive, long-term monitoring proxy of the degradation of HC. We acquired repeated down hole MS logging data in boreholes at a HC-contaminated field research site in Bemidji, MN, USA. The MS data were analyzed in conjunction with redox conditions and iron availability within the source zone to better assess whether MS can serve as a proxy for monitoring HC contamination in unconsolidated sediments. The MS response at the site diminished during the sampling period, which was found to coincide with depletion of solid phase iron in the source zone. Previous geochemical observations and modeling at the site suggest that the most likely cause of the decrease in MS is the transformation of magnetite to siderite, coupled with the exhaustion of ferrihydrite. Although the temporal MS response at this site gives valuable field-scale evidence for changing conditions of iron cycling and stability of iron minerals it does not provide a simple proxy for long-term monitoring of biodegradation of hydrocarbons in the smear zone.

中文翻译：

时间流逝磁化率在碳氢化合物污染位点碳和铁循环耦合的证据

常规表征和监测碳氢化合物（HC）污染通常是昂贵且费时的。磁化率（MS）已被提议作为HC降解的廉价，长期监测指标。我们在美国明尼苏达州贝米吉市的一个被HC污染的现场研究站点中，获取了钻孔中重复的井下MS测井数据。结合氧化还原条件和源区内铁的有效性分析了MS数据，以更好地评估MS是否可以作为监测未固结沉积物中HC污染的替代物。在采样期间，现场的质谱响应减弱，这与源区中固相铁的消耗相吻合。该地点以前的地球化学观测和模型表明，MS降低的最可能原因是磁铁矿向菱铁矿的转变以及铁水合物的耗尽。尽管该地点的临时质谱响应为改变铁循环条件和铁矿物质的稳定性提供了宝贵的现场规模证据，但它并不能为长期监测涂片区碳氢化合物的生物降解提供简单的代理。

更新日期：2017-09-21

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