Also shown in Fig. 4 are the ranges of pH and [DOC]/[Cu] for our
stormwater and bioretention effluent. The bioretention effluent reduced
free Cu2+ activities by orders of magnitude by formation of CuDOM
complexes. Almost all of the copper was organically complexed
at the observed total copper concentrations in the leachate samples, indicating
that DOM released from the compost effectively complexed
aqueous copper