L. G. Decnop-Weever

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From the experimentally determined borderline of precipitation in the pM'-pH diagram the stability constants of the mononuclear and polynuclear species of cerium hydroxide have been determined graphically. The stability constants found are log*beta(1) = -8.1, log*beta(2) = -16.3, log*beta(3) = -26.0, log*beta(5,3) = -32.8 and log*K(s0) = 20.1. These values(More)
A flow-injection method has been developed for the determination of total sulphite in wine samples. After hydrolysis of bound sulphite, sulphur dioxide is separated from the matrix by means of an in-line gas diffusion module. For detection indirect amperometry is used, with iodine as oxidizing reagent. The iodine can be generated in-line by merging and(More)
From the precipitation borderline in the pLa'-pC(H) diagram the stability constants for (mononuclear) lanthanum-hydroxide species have been established. The presence of polynuclear species could not be demonstrated and seems unlikely. The values found were log *beta(1) = -8.6, log *beta(2) = -17.9, log *nu(3) = -27.3 and log *K(s0) = 22.8. The data refer to(More)
By Mannich condensation of o-Cresol Red, iminodiacetic acid and formaldehyde, Semi-Xylenol Orange (SXO) has been prepared in a 10-hr batch-procedure with a yield of about 30%. From the crude product SXO has been isolated by reversed-phase HPLC with perchloric acid-acetone mixtures as the mobile phase and C(18)-bonded silica as the stationary phase. The SXO(More)
From the precipitation borderline in the pM'-pC(H) diagram, determined experimentally under CO(2)-free conditions, stability constants for the mononuclear species of erbium hydroxide have been established. The values found were log ( *)beta(1) = -6.3, log ( *)beta(2) = -14.5, log ( *)beta(3) = -23.1, log ( *)beta(4) = -36.8 and log ( *)K(0) = 18.0. The data(More)
From the absorption spectra it has been concluded that Pd(II) forms a 1:1 complex with pyridine-2,6-dicarboxylic acid in aqueous solution at pH 2. The influence of various concentrations of chloride on the spectr has been examined. Ternary complex formation with chloride does not occur to a measurable extent. The conditional stability constant has been(More)
From the precipitation borderline in the pM'-pH diagram, determined experimentally under CO(2)-free conditions, the stability constants of the mononuclear and polynuclear species of samarium hydroxide have been established. The values found are log beta(1) = -7.5, log beta(2) = -15.0, log beta(3) = -22.7, log beta(4, 3) = -19.5 and log K(s0) = 17.5. They(More)
From the position of the equilibrium Th + PdEDTA <--> Pd + ThEDTA, the stability constant of PdEDTA can be related to that for ThEDTA. If log k(ThEDTA) = 25.3 is taken as the most reliable value currently available, log k(pdEDTA) = 25.6 +/- 0.2 is found (NaClO(4) medium, 21 +/- 1 degrees ). Repetition of the experiments at different chloride concentrations(More)
From measurements of solubility as a function of pC(H), the protonation constants of EDTA, DCTA and DTPA for the first dissociation and addition steps have been determined. The following values were found: EDTA: log k(6) = -0.10 +/- 0.05, log k(5) = 1.45 +/- 0.02, log k(4) = 1.95 +/- 0.02 and log k(3) = 2.50 +/- 0.03; DCTA: log k(5) = 1.78 +/- 0.02, log(More)