Lead and cadmium contamination in soils: impacts and phytoremediation strategies using ornamental plants, nanoparticles, and organic growth regulators.
Ammara S, Rafiq MT, Ali B, Aziz R, Aziz M
Phytoremediation
Vegetables grown in urban garden plots or on land near old industrial sites can quietly accumulate lead and cadmium at levels that exceed safety thresholds — and standard soil tests don't always flag the risk.
Lead and cadmium are toxic metals that sneak into soil from old pipes, fertilizers, and industrial pollution, and plants can absorb them right into the food we eat. Scientists are exploring ways to clean up this contaminated soil using plants that soak up the metals without being used for food — like sisal, a fast-growing fiber plant. Spraying crops with tiny zinc oxide particles or moringa leaf extract may also help reduce how much of these metals the plants take up in the first place.
Key Findings
Lead and cadmium levels in soils and vegetables across multiple countries exceeded WHO permissible limits, posing direct risks to food safety.
Sisal (Agave sisalana) is identified as a strong phytoremediation candidate because it grows rapidly, produces high biomass, and its fiber can directly sequester lead and cadmium from soil without competing with food crops.
Foliar application of zinc oxide nanoparticles and moringa leaf extract may reduce uptake of lead and cadmium in plants, though combined effects of these techniques require further research.
chevron_right Technical Summary
Lead and cadmium from industrial and agricultural sources are contaminating soils and vegetables worldwide at levels exceeding WHO safety limits. This review finds that the ornamental plant sisal, zinc oxide nanoparticles, and moringa leaf extract show promise for pulling these toxic metals out of contaminated soil without disrupting food production.
Abstract Preview
The contamination of agricultural land with toxic chemicals, such as lead (Pb) and cadmium (Cd), has become a major global concern, negatively affecting the ecosystem, public health, and food safet...
open_in_new Read full abstractAbstract copyright held by the original publisher.
Was this useful?
Chloroplast Genome Editing Eliminates Gluten Immunogenicity in Triticum aestivum
It could mean that people with celiac disease — roughly 1 in 100 worldwide — may one day safely eat bread made from real wheat, without sacrificing the taste...
Sisal is a species of flowering plant native to southern Mexico, but widely cultivated and naturalized in many other countries. It yields a stiff leaf fiber used in making rope and various other products. The sisal fiber is traditionally used for rope and twine, and has many other uses, including...