condition mean min max 12pM Fe 6.864834999999999 6.75467 6.975 58pM Fe 7.283473571428571 6.66982 7.897127142857143 233pM Fe 7.89745 7.89745 7.89745 1160pM Fe 5.158744821428571 3.8182825 6.499207142857142 Dark 4.721009666666666 4.13592 5.306099333333333 Light 3.097266307692308 3.097266307692308 3.097266307692308 Phloroglucinol 9.5831 9.5831 9.5831