Dispersive liquid-liquid microextraction coupled with digital image colorimetric analysis for detection of total iron in water and food samples
2017; Elsevier BV; Volume: 230; Linguagem: Inglês
10.1016/j.foodchem.2017.03.099
ISSN1873-7072
AutoresBo Peng, Guorong Chen, Kai Li, Min Zhou, Ji Zhang, Shengguo Zhao,
Tópico(s)Electrochemical Analysis and Applications
ResumoA simple and low cost assay for total iron in various samples based on dispersive liquid-liquid microextraction (DLLME) coupled with digital scanning image analysis was proposed. Orthogonal experiment design was utilized to optimize the amount of extraction solvent and disperser solvent, O-phenanthroline concentration and buffer pH. Under the optimum conditions, the calibration curve was linear over the range of 0.047-1.0μgmL-1 (R2>0.99) of iron. The limit of detection (LOD) for iron was 14.1μgL-1 and limit of quantification (LOQ) was 46.5μgL-1. The relative standard deviations for seven replicate determinations of 0.5μgmL-1 of iron was 3.75%. The method was successfully applied for analysis of total iron in water and food samples without using any spectral instrument and it could have a potential industrial impact in developing fast and portable devices to analyze the iron content in water and certain foods.
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