condition mean min max 12pM Fe 38.7714 26.4994 51.0434 58pM Fe 24.442928571428574 13.8556 35.030257142857145 233pM Fe 3.61393 3.61393 3.61393 1160pM Fe 9.006957321428573 8.4092075 9.604707142857142 Dark 4.2505619999999995 2.74021 5.760914 Light 4.95444076923077 4.95444076923077 4.95444076923077 Phloroglucinol 9.26402 9.26402 9.26402