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• W3150150098 endingPage "103807" @default.
• W3150150098 startingPage "103807" @default.
• W3150150098 abstract "Rates of natural source zone depletion (NSZD) are increasingly being used to aid remedial decision making and light non-aqueous phase liquid (LNAPL) longevity estimates at petroleum release sites. Current NSZD estimate methods, based on analyses of carbon dioxide (CO2) and oxygen (O2) soil-gas concentration gradients (gradient method) assume linear concentration profiles with depth. This assumption can underestimate the concentration gradients especially above LNAPL sources that are typically characterized by curvilinear or semi-curvilinear O2 and CO2 concentration profiles. In this work, we proposed a new method that relies on calculating the O2 and CO2 concentration gradient using a first-order reaction model. The method requires an estimate of the diffusive reaction length that can be easily derived from soil-gas concentration data. A simple step-by-step guide for applying the new method is provided. Nomographs were also developed to facilitate method application. Application of the nomographs using field data from published literature showed that NSZD rates could be underestimated by nearly an order of magnitude if reactivity in the vadose zone is not accounted for. The new method helps refine NSZD rates estimation and improve risk-based decision making at certain petroleum contaminated sites." @default.
• W3150150098 created "2021-04-13" @default.
• W3150150098 creator A5013028130 @default.
• W3150150098 creator A5034031013 @default.
• W3150150098 date "2021-08-01" @default.
• W3150150098 modified "2023-09-23" @default.
• W3150150098 title "Refinement of the gradient method for the estimation of natural source zone depletion at petroleum contaminated sites" @default.
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• W3150150098 doi "https://doi.org/10.1016/j.jconhyd.2021.103807" @default.
• W3150150098 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/33838564" @default.
• W3150150098 hasPublicationYear "2021" @default.
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