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By Rudolf Pribil

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The colour changes from red to yellow with this indicator are sufficient­ ly sharp if a high enough concentration of indicator is used. Alizarin Compiexone has also been used for the determination of molybdenum(v) by Headridge [113]· Remarks. The most interesting reaction of this compound was dis­ covered by Leonard [114] and exploited by Belcher, Leonard and West [115]· The red complexes of Alizarin Complexone with cerium, lanthanum and praseodymium form a blue ternary complex with fluoride, which allows spectrophotometrie determination of fluoride.

3. Patton-Reeder Indicator (Cal-Red) 2-Hydroxy-1-(2-hydroxy-4-sulpho-1-naphthylazo)-3-naphthoic acid ( v ) . This was proposed by Patton and Reeder [12] for EDTA titration of calcium at pH 1 2 - 1 4 and for the determination of calcium + magnesium in ammoniacal solution at pH 10. OH HO COOH V: Cal-Red The colour change from wine-red to blue in the titration of magnesium is very sharp. In the presence of magnesium in sodium hydroxide medium the titration of calcium is also reliable. Like Calcon this indicator also functions more or less as an adsorption indicator.

XXXIV 3,6-Dihydroxy-2,4-bis-N,N,-di(carboxymethyl)aminome t h y l f l u o r a n I n s p i t e of t h e i r c o n v i n c i n g work, l i t t l e paid t o t h e i r opinion. a t t e n t i o n has so f a r been Although e n d - p o i n t i n d i c a t i o n w i t h C a l c e i n i s r e l i a b l e enough, some a t t e m p t s have been made t o improve the v i s u a l c o n t r a s t i n the c a l c i u m t i t r a t i o n , e s p e c i a l l y i f t h e i n d i c a t o r used c o n t a i n s t r a c e s of fluorescein.

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