Isotopic modelling of the significance of bacterial sulphate reduction for phenol attenuation in a contaminated aquifer

摘要

A Triassic sandstone aquifer polluted with a mixture of phenolic hydrocarbon has been investigated by means of high-resolution groundwater sampling. Samples taken at depth intervals of 1 m have revealed the presence of a diving pollutant plume with a sharply defined upper margin. Concentrations of pollutant phenols exceed 4 g/l in the plume core, rendering it sterile but towards The diluted upper margin evidence for bacterial sulphate reduction(BSR)has been obtained. Groundwater have been analysed for bothδ~34S-SO_4 andδ~18O-SO_4. Two reservoirs have been Identified with distinct sulphate-oxygen isotope ratios.