No drastic changes had occurred in the composition of macrofauna, but a few alterations in certain parts of the study area were observed. ... 95-9441P Comparison of three methods of estimating atmospheric mercury deposition. ... Mean volume-weighted Hg concentrations varied 2-fold among methods: 8.6 ng/ L for manual, event sampling (wet only) ... Here we present the first direct radiotracer measurements of in situ rates of sulfate reduction for an aquifer ( Roernoe, Denmark).