condition mean min max 12pM Fe 1.3514175 0.0 2.702835 58pM Fe 0.09621642857142856 0.0 0.19243285714285713 233pM Fe 1.45075 1.45075 1.45075 1160pM Fe 8.953911428571429 0.10378 17.804042857142857 Dark 0.29434 0.0 0.58868 Light 1.4066492307692307 1.4066492307692307 1.4066492307692307 Phloroglucinol 2.18114 2.18114 2.18114