By Rudolf Pribil
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Example text
For example zinc as tetrahydroxozincate in strongly alkaline medium "decolorizes" the alkaline form of the indicator, without interfering with its reaction with calcium. This has been utilized for the indirect determination of cadmium and zinc in sodium hydroxide solution by back-titration with a calcium solution [61]. The hypsochromic effect produced by formation of the calcium che late can be improved by suppressing the colour of free indicator by addition of 20 - 30°/o of ethanol. Under these conditions the colour change in the calcium titration is from violet to nearly colourless.
The e x i s t e n c e o f t h e f u r t h e r c o m p l e x e s CaHIn a n d C a l n 2 has not been r e l i a b l y p r o v e d . Acid Alizarin Black SN 7· Calcichrome Caleion IREA. Of the indicators described up till now, Calcichrome is the most Sec. 1] Complexometric Indicators 25 i n t e r e s t i n g , n o t only f o r i t s h i g h l y s e l e c t i v e r e a c t i o n w i t h calcium b u t a l s o f o r i t s as y e t u n s o l v e d s t r u c t u r e . I t was p r e p a r e d by Lukin e t a l .
Some attempts have been made to use them as complexometric indicators, but with disputable results. Therefore they are mentioned here only briefly. Eriochrome Cyanine R is the trisodium salt of 3»3 —dimethyl—2sulphofuchsonedicarboxylic acid (XV). It was suggested as an indicator for the titration of zirconium by Fritz and Fulda [48]. The direct titration of zirconium in hot solution was not good enough, however, and the authors proposed the back-titration of EDTA with zirconium solution. The colour change is from colourless to pink.