Ni. Ershova et Vm. Ivanov, Application of chromaticity characteristics for direct determination of trace aluminum with Eriochrome cyanine R by diffuse reflection spectroscopy, ANALYT CHIM, 408(1-2), 2000, pp. 145-151
Eriochrome cyanine R (ECR) has been applied as immobilized reagent for the
direct determination of aluminum by diffuse reflection spectroscopy. Sorpti
on ability of aluminum species depends on the kind of solid support and inc
reases in the following sequence: anionite AV-17 < silica gel < chromaton-N
- super < cellulose. Chromaticity characteristics of the aluminum sorbates,
namely, color Lightness (L), chromaticity coordinates (A, B), saturation (
S), hue (T), brightness (Y), whiteness (W), yellowness (G), and the total c
olor difference (Delta E), indicate better sensitivity and precision than t
he diffuse reflection coefficient. The experimental parameters (optical cha
racteristics, acidity of aqueous solution, shaking time, volume of aqueous
solution, etc.) affecting the sorption of aluminum species have been optimi
zed. The detection limit is 0.004 mg/l for the aluminum complex immobilized
on cellulose. The precision and accuracy of the proposed method was evalua
ted with real samples, e.g. surface water, salt CH3COONa. (C) 2000 Elsevier
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