vial                            date           treatment               time_elapsed  Fe_II_concentration  standard_deviation  
TAG-1_ASWkan_ferrozine_vial_1   2016/11/14     ASW 1                   72            0.000716998          0.001241877         
TAG-1_ASWkan_ferrozine_vial_1   2016/11/15     ASW + kan 1             96            0.002336648          0.002899159         
TAG-1_ASWkan_ferrozine_vial_1   2016/11/16     ASW + kan 1             119.5         0.006002306          0.007298276         
TAG-1_ASWkan_ferrozine_vial_1   2016/11/17     ASW + kan 1             144           0.01713501           0.00425684