Determination of solution aggregation using solubility, conductivity, calorimetry, and pH measurements

Measurements of parameters expressed in terms of carbonic species such as Alkalinity and Acidity of saline waters do not analyze the influence of external parameters to the titration such as Total free and associated Carbonic Species Concentration, activity coefficient, ion pairing formation and Residual Liquid Junction Potential in pH measurements. This paper shows the development of F5BC titration function based on the titrations developed by Gran (1952) for the carbonate system of natural waters. For practical use, samples of saline watersfrom Pocinhos reservoir in Paraiba were submitted to titration and linear regression analysis. Results showed that F5BC involves F1x and F2x Gran functions determination, respectively, for Alkalinity and Acidity calculations without knowing “a priori” the endpoint of the titration. F5BC also allows the determination of the First and Second Apparent Dissociation Constant of the carbonate system of saline and high ionic strength waters.

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A dynamic continuous-flow dialysis system with on-line electrothermal atomic-absorption spectrometric and pH measurements for in-vitro determination of iron bioavailability by simulated gastrointestinal digestion

Analytical and Bioanalytical Chemistry ◽

10.1007/s00216-005-3288-z ◽

2005 ◽

Vol 382 (6) ◽

pp. 1360-1367 ◽

Cited By ~ 21

Author(s):

Jeerawan Promchan ◽

Juwadee Shiowatana

Keyword(s):

Continuous Flow ◽

Iron Bioavailability ◽

Gastrointestinal Digestion ◽

Ph Measurements ◽

Simulated Gastrointestinal Digestion ◽

On Line ◽

Atomic Absorption Spectrometric ◽

Flow Dialysis

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Determination of Primary and Secondary Standards for pH Measurements inN-Methylacetamide and Its 0.50 Mass Fraction in Admixture with Water, with Characterization of Appropriate Salt Bridges

Journal of Chemical & Engineering Data ◽

10.1021/je600581j ◽

2007 ◽

Vol 52 (5) ◽

pp. 1595-1602 ◽

Cited By ~ 3

Author(s):

Doru Dumitrel ◽

Luigi Falciola ◽

Manuela Liotto ◽

Patrizia R. Mussini ◽

Torquato Mussini ◽

...

Keyword(s):

Mass Fraction ◽

Salt Bridges ◽

Ph Measurements ◽

Primary And Secondary Standards

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Determination of sulfuric acid first dissociation constants to 400°C and 32MPa by potentiometric pH measurements

The Journal of Supercritical Fluids ◽

10.1016/j.supflu.2003.12.006 ◽

2004 ◽

Vol 31 (3) ◽

pp. 295-299 ◽

Cited By ~ 7

Author(s):

Kiwamu Sue ◽

Munehiro Uchida ◽

Tadafumi Adschiri ◽

Kunio Arai

Keyword(s):

Sulfuric Acid ◽

Dissociation Constants ◽

Ph Measurements

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Measurement of glucose in plasma by a differential pH technique.

Clinical Chemistry ◽

10.1093/clinchem/29.1.80 ◽

1983 ◽

Vol 29 (1) ◽

pp. 80-85 ◽

Cited By ~ 14

Author(s):

M Luzzana ◽

G Dossi ◽

A Mosca ◽

A Granelli ◽

D Berger ◽

...

Keyword(s):

Reference Method ◽

Glass Capillary ◽

Ph Measurements ◽

Differential Measurement ◽

Control Chemical ◽

Microcomputer Control ◽

Internal Volume ◽

Glucose 6 Phosphate Dehydrogenase ◽

Better Than

Abstract A new automatic apparatus based on the differential measurement of pH between two solutions has been developed. Two 25-microL (internal volume) glass capillary electrodes are used to measure the results of automated (under microcomputer control) chemical reactions that lead to the liberation or the uptake of hydrogen ions. The sensitivity of the differential pH measurements is better than +/- 0.0001 pH unit, and the change in H+ concentration that can be detected by such an apparatus is 1 mumol/L for plasma and 3 mumol/L for whole blood. The technique has been applied to the measurement of glucose in plasma, giving results in agreement with the specifications of the Food and Drug Administration reference method for quantitative determination of glucose (hexokinase/glucose-6-phosphate dehydrogenase method).

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