摘要
明胶铁有多种价态．其中三价铁的减感效应是无疑的，然而低价铁对卤化银乳剂感光性能影响的研究并不多．我们研究了二价铁对硫敏化卤化银乳剂及硫金敏化卤化银乳剂感光度的影响，发现掺杂在明胶中的二价铁使得这些乳剂的感光度下降．为了揭示二价铁的影响机制，我们还观察了在乳剂成熟阶段明胶铁的价态和结合形态的变化．
There are various valences of iron in gelatins. According to earlier studies, the desensitizing effect of iron with +3 valence has been undoubted. However, the influence of iron with lower valence on photographic sensitization of asilver halide emulsion is hazy due to lack of exploration. In this paper investigations of the influences of Fe 2+ ions in gelatin medium on the sensitivities of silver halide emulsions with sulfur and sulfur plus gold sensitizers are made, respectively. The drop of emulsion sensitivity is found to result from doped Fe 2+ ions in gelatin medium. The change of iron valence in gelatin solution in the ripening stage and the combination feature of Fe 2+ ions in the gelatin solution with or without thiosulfate are also observed.
