Landfill Leachate Monitoring: Applications of Stable Isotopes
نویسنده
چکیده
The most significant impact of a landfill on the surrounding environment has been consistently identified as arising from the leachate (Farquhar 1989; CAE 1992; Mulvey 1997). Therefore, environmental monitoring programmes for landfills tend to focus on the detection of leachate impacts, particularly any contamination of ground and surface water (Lee and Jones 1991; DCC 1994). Conventional monitoring programmes involve periodic sampling of ground and surface waters surrounding a landfill, for chemical indicators of contamination, such as ammonium, chloride, and heavy metal levels. However, this conventional approach may not be effective in environments where the background levels of many of the chemical indicators are already high, such as wetland areas or sites with contamination that pre-dates the landfill. There is a need for an indicator that can positively identify leachate as the source of contamination in a monitored environment. Stable isotope analysis is being increasingly used in studies of environmental pollution as a means of pinpointing pollution sources (Peterson and Fry 1987; Macko and Ostrom 1994). The relatively distinct isotopic ratios or signatures of substances, created through biogeochemical processes, offer great potential for tracing contaminants such as leachate in the environment.
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