A Simple Spectrophotometric Method for the Determination of Aluminum in Some Real, Environmental, Biological, Soil and Pharmaceutical Samples Using 2-Hydroxynaphthaldehydebenzoylhydrazone

Eurasian Journal of Analytical Chemistry

M. Reazul Hoque¹  M. Jamaluddin Ahmed¹  S. C. Bhattacharjee¹  A. S. M. Shahed Hossain Khan¹ 

关键词: Photoacoustic spectroscopy;    electromagnetic radiation;    sound waves;    modulation schemes;   

DOI  :  10.12973/ejac.2010.00077a

学科分类：分析化学

来源: Eurasian Journal of Analytical Chemistry

【 摘 要 】

A simple ultra-trace, and highly selective non-extractive spectrophotometric method is presented for the rapid determination of aluminum at trace levels using                2-hydroxynaphthaldehydebenzoylhydrazone (HNPBH) as a new spectrophotometric reagent (l_max = 412 nm) in slightly acidic solution (1.5×10^-5-1.25×10^-4 M H₂SO₄) in 50% N,N-dimethylformamide (DMF) medium. The reaction is instantaneous and absorbance remains stable for over 24 h. The color system obeys Beer’s law from 0.01-2.0 mgL^-1 having detection limit of 1 µg L^-1 and RSD 0-2%. The average molar absorptivity and Sandell’s sensitivity were found to be 2.21´10⁴ L mol^-1 cm^-1 and 6 ng cm^-2, respectively. The stoichiometric composition of the chelate is 2:3. The interference from over 50 cations, anions, and complexing agents (tartrate, oxalate, citrate, EDTA, DMG, 1.10 phenanthrolin, oxine, phosphate, thio-urea, SCN^-) has been studied at 1 mgL^-1 of Al. The method was successfully applied to some certified reference materials (alloys and steels), environmental waters (inland and surface), biological samples (human blood, urine and gallstone), soils, pharmaceutical samples (entacyd and almasil) and complex synthetic mixtures. The method has high precision and accuracy (s = ±0.01 for 0.5 mgL^-1).

【 授权许可】

Unknown