Soil Contamination and Plant Accumulation under Long-Term Sewage Irrigated Desert Soils: a Case Study in Egypt

Content Provider	Semantic Scholar
Author	Lateef, Ezzat M. Abd El Elsalam, Mostafa Abd Hall, Jessica E. Smith, Stephen R.
Copyright Year	2019
Abstract	As part of a four year study evaluating plant and desert soil contamination in Egypt, desert soil and plant surveys were carried out on a citrus plantation, irrigated with Cairo sewage since the 1920s, in order to evaluate the long-term accumulation of trace elements and heavy metals and their bioavailability. While total and DTPA soil concentrations correlated well, no relationship could be found between soil and plant tissue concentrations, despite elevated levels of heavy metals in the soil. The study of long-term contamination of soil with PTEs has not demonstrated a potential risk to crop quality and yield or human health from the slow accumulation of potentially toxic elements (PTEs) in sewage treated agricultural soil. PTE concentrations in plant tissues remained low and within normal ranges despite significant increases in soil content after long-term irrigation with sewage effluent. Concentrations of PTEs in plant tissues were not related to total or DTPA extractable metals in contaminated soil. DTPA may not be a sufficiently reliable indicator of actual Phyto availability of trace elements in effluent treated soil, although it is accepted that DTPA is widely used in nutrient diagnosis assessment. These data provide assurance about the minimal risk to the environment from trace elements and PTEs in sludge-treated agricultural soil, but a more detailed dietary analysis of Cd intakes under Egyptian conditions is recommended, following the approaches adopted in the UK and US for setting Cd soil limits or loading rates for this element.
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Alternate Webpage(s)	https://icwrae-psipw.org/images/stories/2018/Arid_Evironments/5e.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article