Interactions in iron gall inks
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V. Jančovičová
,
M. Čeppan
Abstract
Simple iron gall inks composed of gallic acid, ferrous sulfate, and gum arabic and in some cases also of copper(II) sulfate were prepared. The process of iron ion complex formation with gallic acid was investigated using UV-VIS spectroscopy, pH measurements, and by monitoring the concentration changes of Fe(II) ions. The admixture of Fe(II) ions to gallic acid induced a bathochromic shift of absorption bands at 215 nm and 265 nm in the UV-VIS spectra. Formation of a new absorbance band in the visible area was also observed and used to calculate the initial rate of complex formation. Concurrently, the pH values and the concentration of Fe(II) ions in the solution decreased. Gum arabic significantly enhanced the complex formation and its stability. On the contrary, the addition of Cu(II) ions to the solution decelerated the complex formation considerably.
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© 2007 Institute of Chemistry, Slovak Academy of Sciences
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Artikel in diesem Heft
- Determination of potassium in fatty acid methyl esters applying an ion-selective potassium electrode
- Selective solid-phase extraction of Cu(II) using freshly precipitated lead diethyldithiocarbamate and its spectrophotometric determination
- Evaluation of colon cancer elements contents in serum using statistical methods
- Determination of norfloxacin in pharmaceuticals, human serum, and urine using a luminol—dissolved oxygen chemiluminescence system
- Properties of fructosyltransferase from Aureobasidium pullulans immobilized on an acrylic carrier
- Influence of two-phase system composition on biocatalytic properties of β-galactosidase preparations
- Thermal decomposition kinetics of strontium oxalate
- Synthesis and properties of lanthanide(III) complexes with 4-hydroxy-3,5-dimethoxybenzoic acid
- Influence of photoinitiator and curing conditions on polymerization kinetics and gloss of UV-cured coatings
- Interactions in iron gall inks
- Bimolecular reduction of 9-alkyl-3-nitrocarbazoles
- A detailed analysis of volatile constituents of Aquilegia pancicii Degen, a Serbian steno-endemic species
- A one-pot synthesis of 8-amino-1-methoxy-6H-dibenzo[b,d]pyran-6-one
- Magnetically modified bentonite as a possible contrast agent in MRI of gastrointestinal tract
