A soil is analyzed for total iron content by dissolving 0.1 g of soil in 10 mL of acid and digesting in a pressure bomb. The digest is filtered, diluted to a final volume of 100 mL, and analyzed for Fe. The total Fe in solution is 40 mg L-1. What is the total iron concentration in the soil in mg kg (ppm) and mmol kg 1? (Atomic wt. Fe = 55.8 g mole-) (Show your work) %3D

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