Assessment of Heavy Metal Accumulation in Wastewater-Receiving Soil-Exotic and Indigenous Vegetable Systems and Its Potential Health Risks: A Case Study from Blantyre, Malawi.

Summary: In Malawi, many city farmers use treated wastewater to water their vegetable gardens. Scientists wanted to know if this practice is safe, so they tested the water, the dirt, and six types of vegetables for heavy metals like lead, copper, and zinc. They found that the wastewater itself was mostly safe and met health standards. However, the dirt had too much zinc in it. The vegetables also soaked up some of these metals, with different amounts stored in their leaves and stems. This means eating these vegetables might carry some health risks over time due to the buildup of heavy metals.