condition mean min max 12pM Fe 0.0 0.0 0.0 58pM Fe 0.107431 0.0 0.214862 233pM Fe 0.456745 0.456745 0.456745 1160pM Fe 0.14382475 0.068756 0.21889350000000002 Dark 2.2911591 2.03598 2.5463382 Light 0.7704458461538461 0.7704458461538461 0.7704458461538461 Phloroglucinol 1.0357063333333334 1.0357063333333334 1.0357063333333334