vial                            date           treatment               time_elapsed  Fe_II_concentration  standard_deviation  
TAG-1_ASWkan_ferrozine_ctrl     2016/11/14     ASW ctrl                72            0.482000396          0.009212351         
TAG-1_ASWkan_ferrozine_ctrl     2016/11/15     ASW + kan ctrl          96            0.873028915          0.015051287         
TAG-1_ASWkan_ferrozine_ctrl     2016/11/16     ASW + kan ctrl          119.5         0.481940219          0.009016277         
TAG-1_ASWkan_ferrozine_ctrl     2016/11/17     ASW + kan ctrl          144           0.38325035           0.002905359