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Table 6 Mass balance of nitrate, sulfate, and sulfide for the main experimental phase (mg)

From: Nitrate consumption by the oxidation of sulfides during an enhanced natural attenuation project at a contaminated site in Berlin, Germany

  Biologically active column Abiotic column
Sulfate formation
 SO42− inflow 249.9 226.0
 SO42− outflow 666.6 251.6
 SO42− formation 416.6 25.6
Sulfide oxidation
 Total amount of oxidized iron disulfide 260.5 16.1
 Total mass of oxidized iron disulfide in the soil 87.4 (mg kg−1) 5.4 (mg kg−1)
 Total amount of oxidized sulfide 139.1 8.6
 Total mass of oxidized sulfide in the soil 46.6 (mg kg−1) 2.9 (mg kg−1)
Nitrate consumption
 Incomplete chemolithotrophic denitrification (Eq. 1) 941.8 58.1
 Complete chemolithotrophic denitrification (Eq. 2) 376.7 23.2
 Oxidation of bivalent iron formed (Eq. 3) 26.9 1.7
Chemoorganotrophic denitrification (Eq. 4) 404.8 3.8
 NO3 consumption calculated according to Eqs. 1, 3, 4 1373.5 63.6
 NO3 consumption calculated according to Eqs. 2, 3, 4 808.4 28.7
 NO3 inflow 7262.6 7630.8
 NO3 outflow 5797.2 7506.2
 NO3 consumption measured 1465.4 124.2