Authors
Betelhem Tefera, Merid Tessema, Mesfin Hailemariam Habetgebriel
Published in
International journal of analytical chemistry. Volume 2026. Pages 1246637. Epub Jun 28, 2026.
Abstract
This study employed flame atomic absorption spectrophotometry to determine the levels of selected heavy metals in Swiss chard. Samples were collected from three vicinities of Addis Ababa: Akaki, Sebeta, and Kotebe. A 0.5-g dried and powdered sample was analyzed using the wet digestion method with 69%-72% HNO3 and 70% HClO4, with optimized digestion. The calibration curves and coefficient (r) value were between 0.996 and 0.999, showing very good linearity. The accuracy of the optimized procedure was tested using samples that had a known amount of the substance added. The recovery percentages ranged from 95.89% to 100%, which is a good range. The mean concentrations (mg/kg) of nickel (0.017) and zinc (0.088) in the Swiss chard were determined . The mean concentrations of metals in Swiss chard from the three areas indicated a higher concentration of zinc in Kotebe compared to Akaki and Sebeta. A higher concentration of nickel (Ni) was found in Akaki's Swiss chard compared to Sebeta and Kotebe. The Pearson correlation coefficients of metals from the Swiss chard between nickel and zinc showed a very strong correlation. The best approach combines immediate risk reduction such as cleaner irrigation and consumer warnings, with long-term remediation such as soil treatment, pollution control, and policy enforcement to protect both farmers and consumers.
PMID:
42371602
Bibliographic data and abstract were imported from PubMed on 29 Jun 2026.
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