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By Rudolf Pribil

ISBN-10: 0080262775

ISBN-13: 9780080262772

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Sample text

Bezhevolnov and Kreinbold [133] have studied the fluorescence spectra of Calcein fluorésee in mixtures and worked out a method for determination of the fluorescein in the concentration range 5 x 10""* — 5 x iO~^°/o. The stability of aqueous solutions of the indicator has been studied thoroughly by Hoyle and Diehl [134] by following the development of residual fluorescence. According to those authors, solutions at pH 7 are stable for not more than 7 days. Alkaline solutions can be used reliably for up to 60 days.

I ) a n d t h e CuP h e n c o m p l e x ( l o g K = 9) c o n c l u d e t h a t t h e s i m p l e r e a c t i o n d o e s n o t e x i s t , and t h a t t h e t e r n a r y Cu-XO-Phen complex i s formed, which r e a c t s w i t h EDTA: C u - X O - P h e n + EDTA = Cu-EDTA + P h e n + XO B e r n d t and S a r a [ l 4 5 ] have found t h a t 2 t 2 ' - b i p y r i d y l has s i m i l a r deblocking action. Other complexing a g e n t s a l s o give the e f f e c t , but only i f present at r e l a t i v e l y high c o n c e n t r a t i o n .

1 ] Complexometric I n d i c a t o r s vanadium(v) and d i p h e n y l c a r b a z i d e These r e d o x i n d i c a t o r s practice. 8 do n o t Chemiluminescent has a l s o been proposed seem t o b e w i d e l y u s e d i n 4-9 [l52J. analytical Indicators I t i s beyond t h e scope of t h i s monograph t o d e s c r i b e i n d e t a i l t h e f u n c t i o n o f l u m i n o l a n d l u c i g e n i n [ 1 5 3 ] a s i n d i c a t o r s f o r EDTA For titration. D é t a i l s c a n be found i n W e s t ' s monograph [ 1 0 4 ] .

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Applied Complexometry by Rudolf Pribil


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