Topic
Gran plot
About: Gran plot is a research topic. Over the lifetime, 518 publications have been published within this topic receiving 10987 citations.
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Papers
TL;DR: In this article, the potential -volume curve obtained during potentiometric titrations shows only a small potential change at the end-point, and it has been customary to plot a deltaE/deltaV-volume curve and to take the peak of this curve as the equivalent point.
Abstract: When the potential - volume curve obtained during potentiometric titrations shows only a small potential change at the end-point, it has been customary to plot a deltaE/deltaV - volume curve and to take the peak of this curve as the equivalent point. In 1950, the author proposed a method of transforming these curves by a numerical manipulation into straight lines intersecting at the equivalence point. In this article another way of transforming titration curves into straight lines has now been developed. A simple theoretical treatment shows that the method can be applied to titrations involving acids and bases, ionic precipitations, formation of complexes, and oxidation - reduction reactions. To facilitate the use of the method a table has been compiled giving quantities to be calculated and plotted against volume of titrant added. These quantities can be evaluated by simple slide rule calculations and, since straight line relationships hold, end-points can be obtained by simple extrapolation. The practice of the method is applicable to potentiometers calibrated either in millivolts or in pH units, even when titrations other than acid - alkali reactions are in use.
2,977 citations
1,047 citations
TL;DR: This chapter reviews that titration curves do not represent just another way of physically characterizing a protein molecule, and contains experimental procedures of general utility in the determination of titration data.
Abstract: Publisher Summary This chapter reviews that titration curves do not represent just another way of physically characterizing a protein molecule. More than most other physicochemical methods that are in common use, titration studies tend to emphasize individual differences among proteins, and this is reflected in the chapter. The chapter contains experimental procedures of general utility in the determination of titration data. The foundation for any study of hydrogen ion dissociation in proteins is the electrometric titration curve. To obtain such a curve, one begins with a protein solution of known concentration, at an arbitrary reference pH, adds to it varying amounts of a strong acid or a strong base, and then measures the new pH attained. In a separate experiment, or by means of calculations based on similar experiments, one determines how much acid or base is needed to take a solution, which does not contain protein, but otherwise has the same initial pH, ionic strength, and volume. The difference between the two amounts is the amount of acid or base that is bound to the protein in going from the reference pH to the final pH: a plot of this quantity versus the final pH is the desired titration curve. In plotting this curve, OH - ions bound are counted as H + ions dissociated a procedure, which is always permissible in aqueous solutions.
508 citations
TL;DR: In this paper, the titration alkalinity At and the total carbon dioxide concentration Σ CO2 of a sea water sample can be determined by direct potentiometric titration.
404 citations
TL;DR: In this article, a new colloid titration method is proposed based on the stoichiometric combination of positive and negative colloid ions and the end point is decided by metachromatic coloring matters.
Abstract: A general discussion about the method of colloid titrations is given in this report. A new titration method is based on the stoichiometric combination of positive and negative colloid ions. The end point is decided by indicators (known as metachromatic coloring matters) like toluidine blue. The standard colloid reagents are P.V.S.-K (potassium salt of polyvinyl alcohol sulfate) and Macramin (N-polymethylated chitosan derivatives). The typical operations of this method are described briefly: the direct, indirect, and differential titration methods. The colloid titration curve is somewhat different from the acid-base titration curve obtained potentiometrically, but it is characteristic and reproducible under definite conditions and so it is useful in quantitative and qualitative analysis. This titration may be carried out even under extraordinary dilute conditions (5 × 10−4N) and the entire process is quite similar to the usual acid-alkali titration. The precision is below ±ca. 5% if the method is carefully followed.
361 citations
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Performance Metrics
| Year | Papers |
|---|---|
| 2024 | 1 |
| 2023 | 3 |
| 2022 | 4 |
| 2020 | 3 |
| 2018 | 1 |
| 2017 | 1 |