vial                            date           treatment               time_elapsed  Fe_II_concentration  standard_deviation  
PV-1_ASWkan_ferrozine_ctrl      2016/11/05     ASW kill control        72            0.519860065          0.017925138         
PV-1_ASWkan_ferrozine_ctrl      2016/11/06     ASW + kan kill control  96            0.879585494          0.007798252         
PV-1_ASWkan_ferrozine_ctrl      2016/11/07     ASW + kan kill control  120.5         0.6691014            0.003429899         
PV-1_ASWkan_ferrozine_ctrl      2016/11/08     ASW + kan kill control  145.5         0.4258821            0.01108135