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Cloud point extraction to avoid interferences by structured background on determination in plant materials by FAAS.

Sidnei G Silva1, Pedro V Oliveira1, Joaquim A Nóbrega2

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Analytical Methods : Advancing Methods and Applications
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PubMed
Summary

This study presents a new method for determining nickel in plants using microwave digestion and a double cloud point extraction technique. The method effectively removes interferences and accurately quantifies nickel, offering a reliable analytical procedure.

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Area of Science:

  • Analytical Chemistry
  • Environmental Science
  • Plant Nutrition

Background:

  • Accurate nickel determination in plant materials is crucial for assessing nutritional status and potential toxicity.
  • Existing methods often face challenges with spectral interferences from organic matrix components, particularly phosphorus.
  • Need for efficient sample clean-up and pre-concentration techniques for trace metal analysis in complex matrices.

Purpose of the Study:

  • To develop and validate a robust analytical procedure for nickel determination in plant samples.
  • To employ microwave-assisted digestion and double cloud point extraction for sample preparation and interference removal.
  • To achieve sensitive and accurate nickel quantification using flame atomic absorption spectrometry (FAAS).

Main Methods:

  • Microwave-assisted digestion using diluted acids for sample decomposition.
  • Double cloud point extraction (CPE) utilizing a micellar medium for sample clean-up, removing phosphorus-containing species.
  • Pre-concentration of nickel complexes formed with 1,2-thiazolylazo-2-naphthol via CPE for enhanced sensitivity.

Main Results:

  • Successful removal of spectral interferences caused by PO species, attributed to the micellar medium in CPE.
  • Achieved a significant pre-concentration factor of 30 for nickel.
  • Obtained a low detection limit of 5 µg L⁻¹ (99.7% confidence level) and linear response up to 80 µg L⁻¹.

Conclusions:

  • The proposed method, combining microwave digestion and double CPE, is effective for nickel determination in plant materials.
  • The technique provides accurate and reliable results, validated by analysis of certified reference materials.
  • This approach offers a sensitive and interference-free method for trace nickel analysis in complex botanical samples.