Spectrofluorimetric determination of aluminium using 2‐hydroxy‐1‐naphthylidene‐(8‐aminoquinoline)

Abstract

A sensitive and selective spectrofluorimetric method has been developed for the rapid determination of aluminium. This method is based on the complex formation between aluminium and 2-hydroxy-1-naphthylidene-(8-aminoquinoline) (HNAQ). The optimum conditions for the complex formation were a metal-to-ligand (M : L) stoichiometric ratio of 1:1, a pH of 5.5 and a 0.20 m acetate buffer. The fluorescence of the complex was monitored at an emission wavelength of 502 nm with excitation at 438 nm. Under these conditions, linear calibration curves were obtained in the ranges 0.05-1 and 1-5 ppm. The detection limit was 3.4 ppb for the former and 13.5 ppb for the latter. The maximum relative standard deviation of the method for an aluminium standard of 200 ppb was 1.5% (n = 5). This method was successfully applied for the determination of aluminium in drinking water, pharmaceutical antacid tablets and suspension samples.

Binding study of lysozyme with Al(III) using chemiluminescence analysis

“…It was found that Al(III) in saliva reached a maximum of 101.2 ng mL −1 at 3.0 h. The absorption rate constant k a , elimination rate constant k and half‐life t 1/2 of Al(III) were 1.378 h −1 , 0.264 h −1 and 2.624 h, respectively. Compared with other reported methods, summarized in Table , including FL , inductively coupled plasma atomic emission spectroscopy , AAS and CL , it was shown that the proposed CL method improved the LOD by three orders of magnitude, and Al(III) could be determined at the pictogram level in biofluid with remarkable sensitivity.…”

Variation in crystalline architectures through supramolecular interactions in copper(II) complexes with tridentate N2O donor Schiff bases

“…The luminescence data, listed in table 10 (without solvent correction), are assigned as intra-ligand 1 (π-π*) fluorescence [46]. The relative quantum yields of ligands HL 1 and HL 2 and all three complexes are determined using coumarin 6 in methanol as the reference (Φ f = 0.78) at λ ex = 430 nm [47]. The quantum yields for HL 1 and HL 2 are 0.05 and 0.08, respectively.…”

Spectrofluorimetric determination of aluminium in water samples using N-((2-hydroxynaphthalen-1-yl)methylene) acetylhydrazide

“…Many fluorogenic reagents have been used for the determination of aluminium based on the formation of metal complexes. These include quercetin [14], morin [15,16], purpurin [17], lumogallion [18,19], 8-hydroxyquinoline-5-sulfonic acid [20], oxine [21,22], chromotropic acid [23,24], salicylaldehyde picolinohydrazone [25], N,N-disalicylidene-1,3diamino-2-hydroxy propane [26], 8-hydroxy-7-(4-sulfo-1-naphthylazo)-5-quinoline sulfonic acid (HSNQ) [27], N-o-vanillidine-2-amino-p-cresol [28]) and 2-hydroxy-1-naphthylidene-(8-aminoquinoline) [29].…”

“…As part of our recent method development [15,16,27,29,30] for the sensitive monitoring of aluminium ions in water, we report herein a novel method for the determination of aluminium using the fluorogenic ligand N-((2-hydroxynaphthalen-1-yl) methylene) acetylhydrazide (HNMA). Factors affecting complexation and the effects of foreign species were studied.…”