condition mean min max 12pM Fe 9.6418225 8.462445 10.8212 58pM Fe 7.038473571428572 5.162157142857143 8.91479 233pM Fe 3.76918 3.76918 3.76918 1160pM Fe 3.869849583333333 2.3092291666666664 5.43047 Dark 4.351029666666666 3.6381 5.063959333333333 Light 4.377552230769231 4.377552230769231 4.377552230769231 Phloroglucinol 9.24896 9.24896 9.24896