钨酸钙核/卤化银壳微晶乳剂的二次定影研究

STUDY ON THE SECOND FIXING OF CaWO 4 CORE /AgX SHELL MICROCRYSTAL EMULSION

近２０年来，随着卤化银微晶合成技术的进步，合成出了诸如Ｔ－颗粒、核壳乳剂和外延复合颗粒乳剂等性能优异的微晶体，极大地提高了乳剂的感光性能．但这些乳剂也有一个共同的缺点，即大量消耗贵金属银，且未成影像的银均随定影过程而浪费．为改善此类乳剂的不足，各国科...

The capability of EDTA disodium salt( CDTA ) solution as a second fixing solution to dissolve CaWO 4 core/AgX shell microcrystal emulsion was studied in this paper. The results showed that EDTA disodium salt (CDTA) solution is available for dissolving CaWO 4 in the range of pH 5￣12, CaWO 4 can be fully dissolved. The capability of EDTA disodium salt(CDTA) solution to dissolve CaWO 4 core/AgX shell microcrystal emulsion is affected by temperature, pH value and concentration of EDTA disodium salt(CDTA) solution. In comparison with CDTA, the change of concentration of EDTA disodium salt solution makes a greater effect on the fixing capability of EDTA disodium salt than that of CDTA. Under the same conditions of temperature、concentration and pH value, the complexing speed of EDTA disodium salt solution with CaWO 4 is faster than that of CDTA solution.