Anthropogenic–induced environmental and ecological changes in the Nile Delta over the past half-century

Abdel-Raheem, Khalaf H.M.; Khalil, Mahmoud M.; Abdelhady, Ahmed A.; Tan, Liangcheng

doi:10.1016/j.scitotenv.2024.171941

Science of The Total Environment

2024

DOI: 10.1016/j.scitotenv.2024.171941

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Anthropogenic–induced environmental and ecological changes in the Nile Delta over the past half-century

Khalaf H.M. Abdel-Raheem,

Mahmoud M. Khalil,

Ahmed A. Abdelhady

et al.

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Cited by 4 publications

References 90 publications

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Historical record of heavy metals in the mollusk shells of the Nile Delta

Abdelhady,

Xiao,

Fan

et al. 2024

Marine Pollution Bulletin

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Historical record of heavy metals in the mollusk shells of the Nile Delta

Abdelhady,

Xiao,

Fan

et al. 2024

Marine Pollution Bulletin

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Hydrochemical characterization and sustainability assessment of Ismailia canal water, Eastern Nile Delta, Egypt: implications for human health and environmental safety

El-Said Salem,

Attiah,

Abu-Alam

2024

Front. Environ. Sci.

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Surface freshwater systems globally face severe stresses due to overpopulation and associated waste. The Ismailia Canal, a crucial freshwater source in the eastern Nile Delta, Egypt, serves multiple purposes and is endangered by various environmental activities. This study characterizes the canal’s water using physicochemical parameters to evaluate its suitability for different uses. Water samples were collected twice in winter and summer seasons of the year 2018 from eight sites distributed along the course of Ismailia Canal. A comprehensive chemical analysis of the samples was carried out. Water chemistry was graphically and statistically assessed. Water qualities were evaluated using WHO guidelines, water quality index (WQI), Pollution indices of metals (PIm) and long- and short-term effect of trace elements on irrigation. Results show that the water is slightly alkaline and moderately hard, with higher salinity in winter than summer. Major cations and anions are higher in winter, whereas NO₃ is higher in summer. The canal water is primarily of the Ca(Mg)-HCO₃ type, influenced mainly by rock-water interactions. While most physicochemical parameters meet drinking water standards, Al, Sb, As, Cd, Fe, Pb, and Tl exceed limits, with significant impacts from Al and Tl year-round, and seasonal impacts from As, Pb, Cd, and Fe. For irrigation, water quality is generally unaffected in winter, but Mo and Se have slight impacts in summer for long-term use. This research is vital for informing sustainable water management practices, which are crucial for Egypt’s research initiatives, economic stability, and environmental sustainability.

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Toxic elements in benthic lacustrine sediments of Utah’s Great Salt Lake following a historic low in elevation

Jung,

Frantz,

Fernandez

et al. 2024

Front. Soil Sci.

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Terminal lakes (without outflow) retain elements and compounds that reach them through fluvial, point source or atmospheric deposition. If the lake sediment is exposed, some of these chemicals could become toxic dust particulates. The Great Salt Lake (GSL) in Utah is a terminal lake that experienced record-low lake elevation in 2021-22, exposing vast areas of playa. Here, we used inductively coupled plasma mass spectrometry to analyze the environmental chemistry of GSL shallow sediment during historic lows in spring, summer, and fall of 2021. Contaminants at the subsurface interface are most able to influence diffusion into the water column and uptake by benthic biota. We focused our analysis on copper, thallium, arsenic, mercury, lead, and zinc, which have been historically deposited in this region and are toxic when at high concentrations. We compared records of regional mining activity to understand the current contamination and assess relevant spatial and temporal gradients. We also used two different extraction methods (EPA 3050b and NH4AcO at pH=7) that can distinguish “environmentally available” vs. tightly associated and less available fractions. We observed consistent concentration of copper across sites indicating a larger relative impact of atmospheric deposition, with some evidence indicating further impacts of point sources. Arsenic, on the other hand, is maintained at high levels in submerged sediments and is likely geologically- and fluvially- derived. Thallium and mercury fluctuate seasonally and correlate with lake elevation. Lead and zinc levels are relatively low in GSL sites compared with freshwater input sites, indicating the deep brine layer may sequester these heavy metals, preventing their release into the water column. Overall, the concentrations of most metals in GSL sediments have declined from historic highs. However, each contaminant has distinct sources, seasonality, mobility and transmission. Complete recovery (if possible) may require many more decades and individual remediation strategies.

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Anthropogenic–induced environmental and ecological changes in the Nile Delta over the past half-century

Cited by 4 publications

References 90 publications

Historical record of heavy metals in the mollusk shells of the Nile Delta

Historical record of heavy metals in the mollusk shells of the Nile Delta

Hydrochemical characterization and sustainability assessment of Ismailia canal water, Eastern Nile Delta, Egypt: implications for human health and environmental safety

Toxic elements in benthic lacustrine sediments of Utah’s Great Salt Lake following a historic low in elevation

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