Fig. 1: Aqueous geochemical data from citrate-supplemented and no-citrate control microcosms.

Panels show: (A) pH, (B) citrate concentration, (C) nitrate/nitrite concentration and (D) Ca2+(aq) concentration. Error bars represent 1σ on triplicate measurements. The solid colour lines represent citrate-treated microcosms and the dashed grey lines represent the no-citrate control microcosms.