condition mean min max 12pM Fe 3.967315 2.3867 5.54793 58pM Fe 3.7809342857142854 2.37585 5.186018571428571 233pM Fe 3.5843700000000003 3.5843700000000003 3.5843700000000003 1160pM Fe 6.753630833333333 2.6474116666666667 10.85985 Dark 6.393433 3.39351 9.393356 Light 17.206373307692306 17.206373307692306 17.206373307692306 Phloroglucinol 9.12821 9.12821 9.12821