condition mean min max 12pM Fe 0.0 0.0 0.0 58pM Fe 0.04195828571428572 0.0 0.08391657142857144 233pM Fe 0.0 0.0 0.0 1160pM Fe 0.054309 0.0 0.108618 Dark 3.0279 2.47004 3.58576 Light 1.301963846153846 1.301963846153846 1.301963846153846 Phloroglucinol 2.289259 2.289259 2.289259