Abstract
The authors present data for the chemical, stable isotope ( 13C/ 12C, 15N/ 14N and 34S/ 32S), and dissolved gas (N 2, Ar, O 2 and CH 4) composition of groundwaters sampled in and around a landfill site in Cambridgeshire, England. Decomposition of 3 × 10 6 m 3 of largely domestic waste, placed in unlined quarries, has given rise to the formation of an NH 4-rich leachate dispersing as a plume into the surrounding Middle Chalk aquifer. In addition to identifying zones of methanogenesis and SO 4 reduction, the data indicate processes of NH 4 transformation by either assimilation or oxidation, and losses by formation of N 2. Depending on the mixing ratio between leachate and background water, it may be possible to account for all NH 4 loss by combined nitrification + denitrification in a system where there are abrupt temporal and spatial changes in redox conditions.
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