An anionic resin modified by di-2-pyridyl ketone salicyloylhydrazone as a new solid preconcentration phase for copper determination in ethanol fuel samples

Journal of the Brazilian Chemical Society

Garcia, Samara¹  Gaubeur, Ivanise¹  Universidade Federal do ABC, Santo André, Brazil¹ 

关键词: preconcentration;    DPKSH;    flow analysis;    molecular spectrophotometry;    ethanol fuel sample;   

DOI  :  10.1590/S0103-50532011000300013

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

The adsorption of DPKSH onto anionic resin was investigated at 25 ± 1 ºC and pH 12 on the basis of three kinetic models including pseudo-first order, pseudo-second order and intraparticle diffusion. Isotherm equations including Langmuir, Freundlich and Dubinin-Radushkevich (D-R) were successfully applied to model the experimental data. An anionic resin loaded with DPKSH was used in a flow system for the in-line concentration of copper prior to spectrophotometric determination. Under optimized conditions, a linear response was observed between 20 and 80 µg L-1, with limits of detection and quantification estimated at 0.5 and 1.8 µg L-1, respectively, at the 95% confidence level with an enrichment factor of 11. The relative standard deviation was estimated to be 2.6% for 32 µg L-1 Cu(II) (n = 20). The results obtained for copper determination in ethanol fuel samples agreed with those achieved by flame atomic absorption spectrometry (F AAS) at the 99% confidence level.

【 授权许可】

Unknown