condition mean min max 12pM Fe 2.268811 0.841322 3.6963 58pM Fe 1.4261478571428572 0.0 2.8522957142857144 233pM Fe 1.053863 1.053863 1.053863 1160pM Fe 3.7118769047619047 3.311917142857143 4.111836666666667 Dark 3.873916933333333 3.07601 4.671823866666666 Light 6.915482384615385 6.915482384615385 6.915482384615385 Phloroglucinol 1.61626 1.61626 1.61626