Amphoteric behavior of di-2-pyridyl ketone benzoylhydrazone in ethanol-water mixtures
Guardado en:
| Autor principal: | |
|---|---|
| Formato: | Artículo científico |
| Lenguaje: | en |
| Publicado: |
Universidade Estadual Paulista Júlio de Mesquita Filho
2000
|
| Materias: | |
| Acceso en línea: | |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| _version_ | 1866814222425391104 |
|---|---|
| author | Ivanise Gaubeur |
| author_facet | Ivanise Gaubeur |
| contents | Amphoteric behavior of di-2-pyridyl ketone benzoylhydrazone in ethanol-water mixtures Ivanise Gaubeur Maura Rossi Vincenza Koshun Iha Maria Encarnación Suárez Iha Vázquez Química di aqueous dissociation potentiometry ionization constants The ligand di-2-pyridyl ketone benzoylhydrazone (DPKBH)is widely used for the determination of transition metal ions inenvironmental samples. Due to its low solubility in water it is used inaqueous-ethanol (1:1) solvent and for higher sensitivity the pH must beproperly adjusted. The properties of DPKBH solutions must be known atdifferent ethanol-water percentages in order to achieve highersensitivity and/or selectivity for metal analysis. The acid-base behaviorof this reagent in aqueous-ethanol solvent and thedissociation/ionization constants (pK1 and pK2) of DPKBH have beendetermined in different aqueous-ethanol solvent mixtures (10, 20, 30and 50 % V/V of ethanol) from potentiometric titrations at 25.0 ± 0.1°C. As the amount of ethanol increases from 10 to 30% the pK1 and pK2values increased, but they decreased in 50% of the organic solvent. Theresults are correlated with the medium composition and its effects. 2000 artículo científico 0100-4670 https://www.redalyc.org/articulo.oa?id=42902506 en http://www.redalyc.org/revista.oa?id=429 Eclética Química application/pdf Universidade Estadual Paulista Júlio de Mesquita Filho Eclética Química (Brasil) Num.1 Vol.25 |
| format | Artículo científico |
| id | redalyc_42902506 |
| language | en |
| publishDate | 2000 |
| publisher | Universidade Estadual Paulista Júlio de Mesquita Filho |
| spellingShingle | Amphoteric behavior of di-2-pyridyl ketone benzoylhydrazone in ethanol-water mixtures Ivanise Gaubeur Química di aqueous dissociation potentiometry ionization constants Amphoteric behavior of di-2-pyridyl ketone benzoylhydrazone in ethanol-water mixtures Ivanise Gaubeur Maura Rossi Vincenza Koshun Iha Maria Encarnación Suárez Iha Vázquez Química di aqueous dissociation potentiometry ionization constants The ligand di-2-pyridyl ketone benzoylhydrazone (DPKBH)is widely used for the determination of transition metal ions inenvironmental samples. Due to its low solubility in water it is used inaqueous-ethanol (1:1) solvent and for higher sensitivity the pH must beproperly adjusted. The properties of DPKBH solutions must be known atdifferent ethanol-water percentages in order to achieve highersensitivity and/or selectivity for metal analysis. The acid-base behaviorof this reagent in aqueous-ethanol solvent and thedissociation/ionization constants (pK1 and pK2) of DPKBH have beendetermined in different aqueous-ethanol solvent mixtures (10, 20, 30and 50 % V/V of ethanol) from potentiometric titrations at 25.0 ± 0.1°C. As the amount of ethanol increases from 10 to 30% the pK1 and pK2values increased, but they decreased in 50% of the organic solvent. Theresults are correlated with the medium composition and its effects. 2000 artículo científico 0100-4670 https://www.redalyc.org/articulo.oa?id=42902506 en http://www.redalyc.org/revista.oa?id=429 Eclética Química application/pdf Universidade Estadual Paulista Júlio de Mesquita Filho Eclética Química (Brasil) Num.1 Vol.25 |
| title | Amphoteric behavior of di-2-pyridyl ketone benzoylhydrazone in ethanol-water mixtures |
| topic | Química di aqueous dissociation potentiometry ionization constants |
| url | https://www.redalyc.org/articulo.oa?id=42902506 |