Sorption-XRF determination OF Pb (II) on a gelatin film modified bromopyrogallol red
Abstract
Features of the structure of gelatine make this polymer useful environment for analytical reactions
involving immobilized in a gelatin matrix organic reagents and allow the use of modified gelatin films for
sorption-spectroscopic determination of analytes.
The aim of study was to investigate the possibility of a combination of pre-concentration of heavy
metals using sorbents based on modified gelatin films, followed by X-ray fluorescence detection elements in
concentrates. The study was conducted on the example of determination of Pb (II) in multicomponent mixtures,
with the presence of Cu (II), Fe (III) and Cd (II), using as the sorbent gelatin films modified bromopyrogallol
red (BPGK).
Photographic film AGFA for offset printing with 20 microns of the gelatin layer was used in this
work. Assessment of the metal extraction by modified gelatin film sample was performed using the atomic
absorbtion spectroscopy. Analysis of gelatin film surfaces with immobilized reagents and their complexes
with metals carried out using a scanning electron microscope JEOL JSM-7500F and wavelength dispersive
X-ray fluorescence spectrometric analyser ARL-Perfom'X 4200. The method was tested on model solutions
containing different amounts of Cu (II), Pb (II), Cd (II) and Fe (III). In solutions with an equimolar ratio of
the components of each metal concentration was varied in the range of 1.0·10-6 to 1.0·10-4 M. Solutions with different ratios of metal concentrations were prepared for investigation of isomolar mixtures; total metal concentrations
were 1.0·10-4 and 5.0·10-4 M.
The degree of metal extraction with sorbent based on modified gelatin films and metal distribution
ratios in a heterogeneous system Men+(solution)/Me-BPGK(film) were calculated. It is found that the reagent
and its complexes with metals uniformly distributed in the surface layer of a gelatin film. Analytical signal
dependences on the concentration of Pb (II) and Cu (II), obtained by XRD, are linear in studied concentration
ranges. Fe (III) and Cd (II) characterized by the presence of two or three sensitivity ranges, respectively. Errors
in the determination of Pb (II) in the presence of other metals in the investigated concentration range do
not exceed 15%. By the example of the modified BPGK gelatin films the possibility of application of this
sorbent for sorption-XRF determination of lead (II) in the multi-component mixtures was demonstrated
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