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Table 2 Overview of the discussed in situ tests performed for the BN experiment

From: Impact of the electron donor on in situ microbial nitrate reduction in Opalinus Clay: results from the Mont Terri rock laboratory (Switzerland)

Test code Interval \({\text{NO}}_{3}^{ - }\) \({\text{NO}}_{2}^{ - }\) CH3COO H2 (dissolved) Start date Time of e donor pulse Sterility solution injected Parallel injection of tracers
INT1_2011 1 1.5 2011-03-16 No pulse injection Not sterile Br and 2H–H2O
INT1_2014 1 15 2.3 2014-10-01 54 days Sterile
INT1_2015 1 15 1.6 2015-09-23 48 days Sterile Br
INT2_2011a 2 1.1 0.8 0.8 2011-03-16 No pulse injection Not sterile Br and 2H–H2O
INT2_2011b 2 1.1 0.3 2011-05-31 No pulse injection Sterile
INT2_2013 2 25 4 2013-11-05 70 days Sterile
  1. The indicated concentrations (in mM) of nitrate, nitrite, acetate and dissolved H2 are the final concentrations after injection and dilution in the interval