title: The choice of ultrasound assisted extraction coupled with spectrophotometric for rapid determination of gallic acid in water samples: Central composite design for optimization of process variables.
abstract: A sensitive procedure namely ultrasound-assisted (UA) coupled dispersive nano solid-phase microextraction spectrophotometry (DNSPME-UV-Vis) was designed for preconcentration and subsequent determination of gallic acid (GA) from water samples, while the detailed of composition and morphology and also purity and structure of this new sorbent was identified by techniques like field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD) and Energy-dispersive X-ray spectroscopy (EDX) techniques. Among conventional parameters viz. pH, amount of sorbent, sonication time and volume of elution solvent based on Response Surface Methodology (RSM) and central composite design according to statistics based contour the best operational conditions was set at pH of 2.0; 1.5mg sorbent, 4.0min sonication and 150μL ethanol. Under these pre-qualified conditions the method has linear response over wide concentration range of 15-6000ngmL-1with a correlation coefficient of 0.9996. The good figure of merits like acceptable LOD (S/N=3) and LOQ (S/N=10) with numerical value of 2.923 and 9.744ngmL-1, respectively and relative recovery between 95.54 and 100.02% show the applicability and efficiency of this method for real samples analysis with RSDs below 6.0%. Finally the method with good performance were used for monitoring under study analyte in various real samples like tap, river and mineral waters.
authors: Department of Chemistry, University of Guilan, University Campus 2, Mellat St., Rasht, Iran.
authors: Jaleh
authors: J
authors: Pooralhossini
authors: Chemistry Department, Yasouj University, Yasouj 75918-74831, Iran. Electronic address: m_ghaedi@mail.yu.ac.ir.
authors: Mehrorang
authors: M
authors: Ghaedi
authors: Department of Chemistry, University of Guilan, University Campus 2, Mellat St., Rasht, Iran; Department of Chemistry, Faculty of Science, University of Guilan, Rasht 41335-1914, Iran. Electronic address: zanjanchi@guilan.ac.ir.
authors: Mohammad Ali
authors: MA
authors: Zanjanchi
authors: Chemistry Department, Yasouj University, Yasouj 75918-74831, Iran.
authors: Arash
authors: A
authors: Asfaram
mesh_terms: D005707:Gallic Acid / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification*; D057230:Limit of Detection; D052617:Solid Phase Microextraction / Q000379:methods*; D013010:Sonication; D013053:Spectrophotometry; D013997:Time Factors; D014867:Water / Q000737:chemistry*
chemical_list: D014867:Water; D005707:Gallic Acid
keywords: Determination; Experimental design; Gallic acid; Spectrophotometric; UA-DNSPME-UV-Vis; Water samples