condition mean min max 12pM Fe 25.112825 22.14845 28.0772 58pM Fe 12.336099285714287 9.15307 15.519128571428572 233pM Fe 6.97822 6.97822 6.97822 1160pM Fe 9.944400178571428 9.3032375 10.585562857142857 Dark 16.886727666666665 11.206 22.567455333333335 Light 11.983467692307693 11.983467692307693 11.983467692307693 Phloroglucinol 25.235 25.235 25.235