Simultaneous Spectrophotometric Determination of Some Polycyclic Aromatic Hydrocarbons Using Chemometrics Methods after Their Preconcentration by Salting-Out Assisted Liquid-Liquid Extraction

Amraei, Ahmadreza; Niazi, Ali; Alimoradi, Mohammad; Hosseini, Mohammad

doi:10.30473/ijac.2019.43697.1136

Document Type : Full research article

Authors

¹ Department of Chemistry, Faculty of Science Islamic Azad University, Arak Branch, Arak, Iran

² Department of Chemistry, Central Tehran Branch, Islamic Azad University, Tehran, Iran

³ Department of Chemistry, Faculty of Science Lorestan University, Poldokhtar Branch, Poldokhtar, Iran

https://doi.org/10.30473/ijac.2019.43697.1136

Abstract

A rapid, powerful, satisfactory and modified signal-pre-processing method that is a hybrid of the wavelet transform with orthogonal signal correction (OSC) is used for pre-processing of spectrophotometric data of naphthalene, anthracene and pyrene as analytes after their preconcentration by salting-out assisted liquid–liquid extraction (SALLE) method. Water-miscible extraction solvent (1.0 mL of acetonitrile) and a suitable amount of salt (1.0 g of (NH₄)₂SO₄) are added into the aqueous solution (4.0 mL) and dissolved using a vortex leading to the occurrence of phase separation. The target analytes in the sample was extracted into the water-miscible extraction solvent. After extraction, the absorbance of the analytes mixture was measured in the wavelength range of 200-400 nm. The wavelet orthogonal signal correction (WOSC) was established for denoising and reduction of spectrophotometric data and hybrid with partial least squares (PLS) regression method for simultaneous determination of the studied analytes after the SALLE procedure. The influence of various parameters, such as extraction solvent and volume, type and amount of salt, vortex time and sample pH were studied and optimized. The net analyte signal (NAS) method was used for calculating figures of merit. Linear range (LR) of calibration graphs for naphthalene, anthracene and pyrene were between 0.20 - 2.00, 0.10 - 1.50 and 0.07 -1.00 µg mL^-1, respectively. The obtained model showed good prediction capability with root mean square error of prediction (RMSEP) of 0.030, 0.024 and 0.013 µg mL^-1 for naphthalene, anthracene and pyrene, respectively. The simple WOSC-PLS method has been successfully applied for the simultaneous determination of these analytes in the spiked wastewater samples.

Keywords

20.1001.1.23832207.2019.6.1.2.6

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Iranian Journal of Analytical Chemistry

Simultaneous Spectrophotometric Determination of Some Polycyclic Aromatic Hydrocarbons Using Chemometrics Methods after Their Preconcentration by Salting-Out Assisted Liquid-Liquid Extraction

References

References

Volume 6, Issue 1 - Serial Number 11
March 2019
Pages 10-18

Simultaneous Spectrophotometric Determination of Some Polycyclic Aromatic Hydrocarbons Using Chemometrics Methods after Their Preconcentration by Salting-Out Assisted Liquid-Liquid Extraction

References

References

Volume 6, Issue 1 - Serial Number 11March 2019Pages 10-18

Volume 6, Issue 1 - Serial Number 11
March 2019
Pages 10-18