Ultrasonic assisted dispersive-solid phase extraction for preconcentration of trace metals in wastewater samples

Denga Ramutshatsha-Makhwedzha, Richard Mbaya, Mapula Lucey Mavhungu, Philiswa N. Nomngongo

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

In this work, MgO-SnO-Zeolite composites material has been synthesized, characterized, and, used as a sorbent material in the determination of Cd, Cr, Mn, Ni, and Zn in water samples using the ultrasonic-assisted dispersive-solid phase extraction. The synthesized MgO-SnO-Zeolite composite was prepared by the co-precipitation method and the results show the crystallinity phase of the material that exhibits most of the zeolite structure. Scanning electron microscopy with energy-dispersive X-ray spectroscopy was conducted on the composite material. The structure of the scanning electron microscopy images shows the cubic material with the energy-dispersive X-ray spectroscopy peaks that confirms the presence of the elements that form part of MgO-SnO-Zeolite. Furthermore, they were no impurities observed on the prepared composite material. The central composite design was used to optimize the adsorption and desorption of the developed ultrasonic-assisted dispersive-solid phase extraction method. The optimum conditions were: pH 7.5, extraction time 17.5 min, adsorbent mass 75 mg, desorption time 5 min, eluate concentration 2 M nitric acid, and desorption volume 7 mL. Under optimum conditions, the limit of detection was found to be 0.13, 0.45, 0.21, 0.34, and 0.08 µgL-1 for Cd, Cr, Mn, Ni, and Zn, with a preconcentration factor of 4.3. The intra-day (n = 15) and inter-day (n = 5) precision expressed as relative standard deviations ranged from 0.4 to 1.3 and 1.34-2.4, respectively. The developed ultrasonic-assisted dispersive-solid phase extraction method was found to be applicable for the determination of Cd, Cr, Mn, Ni, and Zn in wastewater samples.

Original languageEnglish
Article number108187
JournalJournal of Environmental Chemical Engineering
Volume10
Issue number5
DOIs
Publication statusPublished - Oct 2022

Keywords

  • Co-precipitation
  • Heavy metals
  • Pre-concentration
  • Wastewater

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Waste Management and Disposal
  • Pollution
  • Process Chemistry and Technology

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