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Cape Peninsula University of Technology (2020)

Heavy metals in soil and vegetables of allotment gardens in the Cape Town environment

Kweza, Motuli

Titre : Heavy metals in soil and vegetables of allotment gardens in the Cape Town environment

Auteur : Kweza, Motuli

Université de soutenance : Cape Peninsula University of Technology

Grade : Master of Technology (MTech) Chemistry 2020

Résumé
This study investigated the concentration of selected heavy metals in soil, water and vegetable crops from selected allotment gardens in Cape Town. Heavy metals occur naturally in the earth’s crust, but due to human activities, their biochemical balance and geochemical cycles have been altered. Heavy metals are abundant in air, soil and water due to environmental pollution. It was therefore of interest to conduct this study to determine the levels of heavy metals (Pb, Cd, Mn, Zn, Cr, Cu, Ni, Fe and Co) in soil, water and vegetables such as spinach, cabbages, green peppers, brinjals and leek onions. Soil, water and vegetables were sampled during winter and summer from the allotment gardens of Cape Town environment and were analyzed using Inductively Coupled Plasma (ICP). The physicochemical parameters of soil and water were determined during both seasons. The average pH of water in winter was 6.53 ± 0.6, while the summer pH was 6.71 ± 0.7. The average soil pH was 6.58 ± 0.2 in winter, while in summer the soil pH was 6.60 ± 0.2. The soil organic matter ranged from 1.7 % to 13.5 % in both seasons. The heavy metals in water and soil showed seasonal fluctuation (p < 0.05). In summer the concentrations in water ranged from 0.062 mg/L to 0.947 mg/L, while in winter it ranged from 0.002 mg/L to 2.347 mg/L. The soil heavy metal concentrations in summer ranged from 0.52 mg/kg to 1127.41 mg/kg, while in winter it ranged from 0.59 mg/kg to 1209.95 mg/kg, Fe having the highest concentrations for both seasons.

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Page publiée le 23 janvier 2021