condition mean min max 12pM Fe 9.843015 7.90623 11.7798 58pM Fe 7.303948571428572 6.60146 8.006437142857143 233pM Fe 5.15229 5.15229 5.15229 1160pM Fe 4.039193988095238 3.5621308333333332 4.5162571428571425 Dark 3.3573899999999997 2.23321 4.48157 Light 2.492869153846154 2.492869153846154 2.492869153846154 Phloroglucinol 1.793355 1.793355 1.793355