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'Absorbance Diagrams' in keywords Facet   section ZfN Section B  [X]
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1976 (1)
1975 (1)
1Author    Requires cookie*
 Title    N ew Methods for Spectrophotometric Determination of pK-Values, II Titration of B ivalent Protolytes  
 Abstract    R ü d i g e r B l u m e , H e i n r i c h L a c h m a n n u n d J ü r g e n P o l s t e r Physikalisch-chemisches Institut der Universität Tübingen H errn P r o f . D r . D r . G. W e i t z e l zum The number of linear independent dissociation equilibria of spectrophotometric titra­ tion may be determined experimentally by means of absorbance diagrams and absor-bance-difference-quotient diagrams. The different types of spectrophotometric titration curves in two-step titrations are classified. By simulation of systematic error functions the limits of plv determination using turning points of two-step titration curves are demonstrated. By means of certain absorbance diagrams it is possible to determine the absorbance of pure ampholyte and to construct the absorbance triangle of all three pure components. From this triangle all concentration-vs pH-curves and the pK-values of a bivalent protolyte may be established. To avoid electrometric pH-measurements new methods are devised to calculate the difference of pK-values of bivalent protolytes. These new methods are demonstrated using as examples o-phthalic acid, 3-hydroxy-4-nitrobenzoic acid and sozoiodolic acid. 
  Reference    (Z. Naturforsch. 30b, 263—276 [1975]; eingegangen am 31. Oktober 1974) 
  Published    1975 
  Keywords    Spectrophotometric Titration, Absorbance Diagrams, Absorbance triangle, pK-Values, pK-Differences 
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 TEI-XML for    default:Reihe_B/30/ZNB-1975-30b-0263.pdf 
 Identifier    ZNB-1975-30b-0263 
 Volume    30 
2Author    Jürgen PolsterRequires cookie*
 Title    Ein neues Verfahren zur spektrometrischen Analyse von Metallkomplex-Lösungen A New Method for Spectrometric Analysis of Complex Metal Solutions  
 Abstract    A new simple method is given to analyse potentiometrically titrated and spectrophoto-metrically measured complex-solutions of the system AH ^ A -j-H3Ü+ and n • A + M^MA n . The absorbance coefficients of the metal complex MA n and the stability constants can be determined for each titration step by construction of the "extinction triangle" in the (two-dimensional) absorbance (E) diagram. It is not necessary to know the absolute pH value of the solution. The titration of 2-nitroso-l-naphthol-4-sulfonic acid/zinc sulfate in water is shown as an example. 
  Reference    (Z. Naturforsch. 31b, 1621—1625 [1976]; eingegangen am 15. September 1976) 
  Published    1976 
  Keywords    Spectrophotometry Titrations, Absorbance Diagrams, Complex, Stability Constants, Absorbance Coefficients 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-1621.pdf 
 Identifier    ZNB-1976-31b-1621 
 Volume    31