| Popis: |
The first action reduced iron method for nitrogen in fertilizers specifies the use of electrolytic iron and indicates that a large excess of iron is required for the reduction of nitrates. Iron reduced by hydrogen, however, is a more efficient reductant than electrolytic iron, but it requires a longer reaction time. The specified amount of iron is excessive. The particle size of the iron is important, and 250-mesh is the largest particle size that should be used; specification of the average particle diameter in microns is recommended. The reduced iron method is, at best, a cumbersome procedure, and other, more efficient, reductants for nitrate should be sought. |
