Deep eutectic solvents based on carboxylic acids for metals separation from plant samples: Elemental analysis by ICP-OES

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Abstract

Deep eutectic solvents based on choline chloride, carboxylic acids, urea, and polyols were investigated for separation of 14 metals from plant samples. It was found that carboxylic acid as precursor of DES played key-role for effective metals separation. It was established that the solvent synthesized from choline chloride and malic acid provided highest extraction recovery (from 73 to 88%). Mixing and heating the solvent and sample for 30 min at a temperature of 70 °C provided effective separation of metals from plant sample. The developed procedure is not required a microwave digestion of samples. After separation the solvent phase containing analytes was dissolved in aqueous phase and analyzed. The developed procedure was applied to elemental analysis of plant tobacco and lettuce samples by inductively coupled plasma optical emission spectroscopy. Limits of detection calculated as three times the signal-to-noise ratio were in the range from 0.2 to 17 mg kg−1.

Original languageEnglish
Article number130634
JournalFood Chemistry
Volume366
DOIs
StatePublished - 1 Jan 2022

Scopus subject areas

  • Analytical Chemistry
  • Food Science

Keywords

  • Deep eutectic solvent
  • Determination of metals
  • Elemental analysis
  • Extraction
  • ICP-OES
  • Lettuce
  • Microwave digestion
  • Plant tobacco

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