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Investigation of Heavy Metal Levels in Talinum Fruticosum (Waterleaf) Cultivated on Dumpsites in Ogwashi-Uku, Delta State, Nigeria

Year: 2026

Type: article

Abstract: The contamination of leafy vegetables with heavy metals from dumpsite soils constitutes a growing public health concern in Nigeria. This study assessed the concentrations of cadmium (Cd), lead (Pb), chromium (Cr), and mercury (Hg) in Talinum fruticosum (waterleaf) harvested from four dumpsite locations in Ogwashi-Uku, Delta State. Leaf samples were collected, authenticated, dried, pulverized, and digested using an aqua regia–perchloric acid mixture. Metal concentrations were determined by atomic absorption spectrophotometry. Results (mean values, mg/L) were as follows: Cd ranged from 0.030 to 0.083; Pb from 0.063 to 0.216; Cr from 0.044 to 1.042; and Hg from 0.014 to 0.449. All Cd, Pb, and Cr values were below the respective FAO/WHO soil guideline values of 1.0, 50, and 150 mg/L. However, Hg exceeded the guideline value of 0.3 mg/L at Ogbe-Onitsha (0.449 mg/L), indicating localized contamination. The findings suggest that while the vegetables are largely safe with respect to Cd, Pb, and Cr, the elevated Hg level at one site warrants precautionary measures. Routine monitoring of heavy metals in vegetables cultivated on or near dumpsites is recommended to safeguard consumer health.

Source: Journal of Pollution Monitoring Evaluation Studies and Control

DOI: 10.54117/dhn8gq43

Authors: Timothy O. Oni, Ajuwa-Itawansa Deborah Eriaborosan, Edward C. Destiny, Chukwuweike Awele

Institution: Delta State Polytechnic Ogwashi-Uku

Language: English

Topic: Heavy metals in environment

Subfield: Pollution

Field: Environmental Science

Domain: Physical Sciences

SDG: Zero hunger

Open Access status: hybrid

OpenAlex ID: W7225225481

FWCI:

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