Box-Behnken design optimization of pipette tip solid phase extraction for methyl orange and acid red determination by spectrophotometry in seawater samples using graphite based magnetic NiFe2O4 decorated exfoliated as sorbent

Sayyed Hossein Hashemi; Massoud Kaykhaii; Ahmad Jamali Keikha; Elahe Mirmoradzehi

doi:10.1016/j.saa.2019.01.049

Box-Behnken design optimization of pipette tip solid phase extraction for methyl orange and acid red determination by spectrophotometry in seawater samples using graphite based magnetic NiFe₂O₄ decorated exfoliated as sorbent

Spectrochim Acta A Mol Biomol Spectrosc. 2019 Apr 15:213:218-227. doi: 10.1016/j.saa.2019.01.049. Epub 2019 Jan 21.

Authors

Sayyed Hossein Hashemi¹, Massoud Kaykhaii², Ahmad Jamali Keikha³, Elahe Mirmoradzehi⁴

Affiliations

¹ Department of Marine Chemistry, Faculty of Marine Science, Chabahar Maritime University, Chabahar 98617-85553, Iran. Electronic address: h.hashemi@cmu.ac.ir.
² Department of Chemistry, Faculty of Sciences, University of Sistan and Baluchestan, Zahedan, Iran.
³ Department of Mechanical Engineering, Faculty of Marine Engineering, Chabahar Maritime University, Chabahar, Iran.
⁴ Department of Marine Chemistry, Faculty of Marine Science, Chabahar Maritime University, Chabahar 98617-85553, Iran.

PMID: 30690305
DOI: 10.1016/j.saa.2019.01.049

Abstract

This article describes synthesis of NiFe₂O₄ decorated exfoliated graphite particles and its application for pipette tip solid phase extraction of methyl orange (MO) and acid red 18 (AR) dyes from seawater samples prior to their determination by spectrophotometry. Various parameters that effect extraction efficiency such as volume and pH of sample, type and volume of eluent solvent, number of cycles of extraction and elution, type and amount of added salt and concentration of surfactant were investigated and optimized using two methods of one-variable-at-a-time and Box-Behnken response surface methodology. Seven factors in three levels were used for experimental design. Under optimum condition, the linear range of method was 5-250 μg/L for both analytes. The limits of detection achieved were 0.9 and 1.0 μg/L, for MO and AR, respectively. The proposed method was successfully applied for the determination of dyes in seawater samples.

Keywords: Acid red 18; Box-Behnken experimental design; Graphite-based pipette tip solid phase extraction; Methyl orange; Response surface methodology; Seawater analysis.