condition mean min max 12pM Fe 12.373475 11.2705 13.47645 58pM Fe 13.444842857142856 8.1229 18.766785714285714 233pM Fe 4.94848 4.94848 4.94848 1160pM Fe 6.393174345238095 5.026482857142857 7.7598658333333335 Dark 9.408190000000001 8.4186 10.397780000000001 Light 5.697156923076923 5.697156923076923 5.697156923076923 Phloroglucinol 5.74137 5.74137 5.74137