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region. However, fiber-optic evanescent wave spectroscopy is a way that allows in-situ MIR absorption spectroscopy in aqueous environments. The optical waveguides provide a rugged and versatile gentle-delivery system while EWS can present suitably quick path lengths by way of a extremely absorbing medium corresponding to water. Fiber-optic biosensors primarily based on immobilized acetylcholinesterase are additionally recognized. In this case, acidity adjustments are monitored utilizing pH-sensitive colorimetric or fluorometric dyes instead of a pH electrode (e.g., Abraxis LLC, Warminster, PA and Severn Trent Services, Ft. Washington, PA industrial kits for detection of aldicarb and dicrotophos pesticides). Alternatively, the enzyme-catalyzed hydrolysis of acetylated luminescent dyes can be followed using excessive sensitivity in automated optical dosimeters. Optical fiber sensors are of particular curiosity due to their robustness, distant-sensing capability, and absence of interferences by electromagnetic fields or floor potentials. This chapter describes the biogeochemistry of a landfill leachate plume as it emerges from the underside of a landfill and migrates in an aquifer. The landfill hydrology, source composition, and spreading of contaminants are described in the introductory sections. The focus on this chapter is on investigating the biogeochemical processes associated with the pure attenuation of natural contaminants in a leachate plume. Studies have shown that microbial processes and geochemical situations change over time and distance in contaminant plumes, resulting in completely different rates of degradation . The availability of electron acceptors, similar to iron oxides or dissolved sulfate, is a vital issue for evaluating the efficacy and sustainability of pure attenuation as a remedy for leachate plumes. Understanding of the complicated environments developing in a leachate plume is necessary in assessing the risk to the groundwater assets and in creating price-efficient remediation strategies. This chapter describes the biogeochemistry of a landfill leachate plume as it emerges from the underside of a landfill and migrates in an aquifer. The landfill hydrology, supply composition, and spreading of contaminants are described in introductory sections. The focus of this chapter is on investigating the
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