vial                            date           treatment               time_elapsed  Fe_II_concentration  standard_deviation  
TAG-1_ASWkan_ferrozine_vial_2   2016/11/14     ASW 2                   72            0.000295761          0.000512273         
TAG-1_ASWkan_ferrozine_vial_2   2016/11/15     ASW + kan 2             96            0.002216294          0.00257397          
TAG-1_ASWkan_ferrozine_vial_2   2016/11/16     ASW + kan 2             119.5         0.008830614          0.005478729         
TAG-1_ASWkan_ferrozine_vial_2   2016/11/17     ASW + kan 2             144           0.01996331           0.001447998