Background/Objectives. When proposing to remediate contaminated subsurface sites through the delivery of amendment materials, it is important to develop a strategy to evaluate and verify the subsurface distribution of the injected material. Amendment material containing zerovalent iron (ZVI) can be traced by measuring the magnetic susceptibility (MS) of soil cores within the injection site. MS measurements indicate the degree of magnetization of a material in response to an applied magnetic field and can be used as a relatively simple and accurate method to quantify the distribution of injection material in subsurface soil. In conjunction with traditional groundwater monitoring activities, MS measurements can serve as a useful tool in evaluating the subsurface distribution of in situ chemical reduction (ISCR) amendment injections.
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