Selectivity of the Mehra-Jackson Reagent to iron-ContainingMinerals in Soils of the Forest Zone

摘要

The low selectivity of the Mehra-Jackson reagent in the forest-zone soils may be caused both by the dissolution of Fe(III)-silictes and the incomplete dissolution of Fe-oxide particles,the latter being observed far rarely.In the forest-zone soils,the balance of dithionite-soluble iron is very often disturbed.Different situations are possible.The content of Fe in the initial soil may exceed its total content in particle-size fractions,the adequacy coefficient being 0