التفاصيل البيبلوغرافية
| العنوان: |
Amphoteric behavior of di-2-pyridyl ketone benzoylhydrazone in ethanol-water mixtures |
| المؤلفون: |
GAUBEUR, Ivanise, ROSSI, Maura Vincenza, IHA, Koshun, SUÁREZ-IHA, Maria Encarnación Vázquez |
| المصدر: |
Eclética Química. January 2000 25 |
| بيانات النشر: |
Fundação Editora da Universidade Estadual Paulista Júlio de Mesquita Filho - UNESP, 2000. |
| سنة النشر: |
2000 |
| مصطلحات موضوعية: |
di-2-pyridyl ketone benzoylhydrazone, aqueous-ethanol solvent mixtures, dissociation/ionization constants, potentiometry |
| الوصف: |
The ligand di-2-pyridyl ketone benzoylhydrazone (DPKBH) is widely used for the determination of transition metal ions in environmental samples. Due to its low solubility in water it is used in aqueous-ethanol (1:1) solvent and for higher sensitivity the pH must be properly adjusted. The properties of DPKBH solutions must be known at different ethanol-water percentages in order to achieve higher sensitivity and/or selectivity for metal analysis. The acid-base behavior of this reagent in aqueous-ethanol solvent and the dissociation/ionization constants (pK1 and pK2) of DPKBH have been determined in different aqueous-ethanol solvent mixtures (10, 20, 30 and 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 pK2 values increased, but they decreased in 50% of the organic solvent. The results are correlated with the medium composition and its effects. |
| نوع الوثيقة: |
article |
| وصف الملف: |
text/html |
| اللغة: |
English |
| تدمد: |
0100-4670 |
| DOI: |
10.1590/S0100-46702000000100006 |
| URL الوصول: |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-46702000000100006 |
| Rights: |
info:eu-repo/semantics/openAccess |
| رقم الانضمام: |
edssci.S0100.46702000000100006 |
| قاعدة البيانات: |
SciELO |