Two readily available environmental materials are
being tested: Material A: 68% by weight of the material is
organic including 19% humic acid, 28% fulvic acid and 21%
humin. 32% of the material is inorganic, containing 23% iron.
Material B: 57% by weight of the material is inorganic, 3% is
humic acid, 27% is fulvic acid and 13% is humin.