Solubility constants and free enthalpies of metal sulphides, part 6: A new solubility cell

Heindl, R.; Gamsjäger, Heinz

doi:10.1007/bf01046450

Cited by 16 publications

(7 citation statements)

References 4 publications

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“…Thus, for all evaluations, directly measured concentrations can be employed rather than activities. Thermostatted (to AE0.05 K) continuously operating solubility cells were used in which intimate contact between solid and solution is effected by percolation utilizing an H 2 Oprehumidi®ed N 2 gas stream [20,21]. These cells are designed to avoid the presence of solid particles in the measuring compartment which contains the electrode system for the continuous potentiometric measurement of H concentrations.…”

Section: Methodsmentioning

confidence: 99%

Solubility of L-Cystine in NaCl and Artificial Urine Solutions

Königsberger

Wang

Königsberger

2000

Monatshefte Fuer Chemie/Chemical Monthly

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L-Cystine is the least soluble of the naturally occurring amino acids, and cystine stones, caused by a genetic disorder, account for between 1±4% of all urinary stones. Since the concentration of cystine in urine is the only factor related to the stone formation, a proper knowledge of cystine solubility in urine is necessary. Some research groups have already reported on the solubility of L-cystine, but the results are scattering. In this work, a systematic investigation of cystine solubility under conditions most pertinent to urolithiasis was carried out. The solubilities of L-cystine were measured at 25.0 and 37.0 C, from pH 1 to 9, and in different media including (i) 0.300 mol Á dm À3 NaCl solution and (ii) arti®cial urine solutions. The Joint Expert Speciation System (JESS) computer package and selected protonation constants of cystine reported in literature were used to model the solubilities of cystine. Excellent agreement was obtained between the experimentally determined solubility data and computer modelling of cystine solubility. The results of this work show that the presence of inorganic components has little in¯uence on the solubility of cystine in urine.Zusammenfassung. L-Cystin ist die am geringsten lo Èsliche natu Èrlich vorkommende Aminosa Èure. Cystinsteine, die durch eine genetische Sto Èrung verursacht werden, machen etwa 1±4% aller Harnsteine aus. Da die Cystinkonzentration im Urin den einzigen fu Èr die Steinbildung verantwortlichen Faktor darstellt, ist die genaue Kenntnis der Cystinlo Èslichkeit in Urin eine notwendige Voraussetzung fu Èr weitere Untersuchungen. Die bisher publizierten Lo Èslichkeitsdaten streuen jedoch sehr stark, so daû in dieser Arbeit eine systematische Studie der Cystinlo Èslichkeit unter Bedingungen durchgefu Èhrt wurde, die denen der Steinbildung mo Èglichst a Èhnlich sind. Die Lo Èslichkeit von L-Cystin wurde bei 25.0 und 37.0 C im pH-Bereich von 1 bis 9 in 0.300 mol Á dm À3 NaCl sowie in ku Ènstlichen Urinlo Èsungen gemessen. Das Joint Expert Speciation System (JESS) sowie ausgewa Èhlte Protonierungskonstanten aus der Literatur wurden zur Modellierung der Cystinlo Èslichkeiten verwendet, wobei eine ausgezeichnete U È bereinstimmung mit den experimentell bestimmten Werten erhalten wurde. Die Ergebnisse dieser Arbeit zeigen, daû anorganische Salze nur einen sehr geringen Ein¯uû auf die Cystinlo Èslichkeit in Urin ausu Èben.

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Section: Methodsmentioning

confidence: 99%

Solubility of L-Cystine in NaCl and Artificial Urine Solutions

Königsberger

Wang

Königsberger

2000

Monatshefte Fuer Chemie/Chemical Monthly

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“…All experiments were performed with a thermostatted, percolation-type solubility cell (5) in a similar manner to those of our previous work. (6)(7)(8) Solubilities of xanthine were measured at T = 298.15 K and T = 310.15 K, respectively.…”

Section: Solubility Measurementsmentioning

confidence: 99%

Solubility and dissolution enthalpy of xanthine

Königsberger

Wang

Seidel

et al. 2001

The Journal of Chemical Thermodynamics

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“…Details about the construction of the solubility cells as well as the procedures for the potentiometric measurements and calibration of the glass electrodes (Schott H 1180) can be found elsewhere. (25)(26)(27)(28) The solid phases were checked by x-ray diffraction analyses before and after the solubility measurements. No changes in the x-ray pattern of malachite or azurite were observed.…”

Section: Solubility Experimentsmentioning

confidence: 99%