32 research outputs found
Electrochemical properties of 6-methoxy-2,5-dimethyl-2H-isoindole-4,7-dione, an antimicrobial alkaloid fromReniera species (short communication)
Extraktionsspektralphotometrische Bestimmung von Antimon mit Triphenyltetrazoliumchlorid
Investigations of the extraction equilibrium of ternary ion-association complexes of thallium(III) with ditetrazolium salts, neo-tetrazolium chloride and nitrobluetetrazolium chloride
Photometric determination of boric acid in milk and milk products by means of 1,1′-dianthrimide
Computer approach to the continuous variations method for spectrophotometric determination of extraction and formation constants
Determination of minute amounts of phenol-2,4-disulphonic acid in the presence of phenol-4-sulphonic acid
Data analysis in the determination of stoichiometries and stability constants of complexes
The determination of stoichiometries and stability constants of complexes by means of UV-visible spectrophotometry applying traditional methods does not evaluate the quality of the values obtained, since the classic application of these methods does not provide coverage intervals. However, the use of chemometric techniques in different steps of the application of these methods makes it possible to obtain not only a real value of the characteristics of the complexes but a validation of such a value. In this paper a methodology is proposed that combines some traditional methods, three different regression models (LMSR, LSR and LSPR) and a small number of mathematical algorithms. This methodology is able to estimate, in a simple and rigorous way, the stoichiometry and stability constant of a complex and its corresponding uncertainties