ملف المستخدم
صورة الملف الشخصي

أ.م.د. أحمد سيد عبد العظيم أصمعى

إرسال رسالة

التخصص: الجيولوجيا البيئية

الجامعة: المركز القومى للبحوث

النقاط:

43
معامل الإنتاج البحثي

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  • مشرفاً على رسائل علمية

الأبحاث المنشورة

Hydro-Geochemical Applications and Multivariate Analysis to Assess the Water–Rock Interaction in Arid Environments

المجلة: Applied sciences

سنة النشر: 2022

تاريخ النشر: 2022-06-22

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Flash flood hazard affected Ras Gharib city, Red Sea, Egypt: a proposed flash flood channel

المجلة: Natural hazards

سنة النشر: 2017

تاريخ النشر: 2017-08-29

Ras Gharib area received heavy rainfall during October 26–27, 2016. This abnormal quantity of rainfall led to flash flooding in the area and consequentially to death of tens of people as well as damage to infrastructures and properties. The Advanced Spaceborne Thermal Emission and Reflection Radiometer Global Digital Elevation Model V002 are used with data resolution 30 m. Data of Tropical Rainfall Measuring Mission detected that precipitation near Ras Gharib was about 10 mm/day. Hydrological and surface analyses are generated using GIS tools. Some important morphometric analyses are calculated for basins description. The intensity and distribution of flood destruction in the study area were controlled by the geologic, geomorphologic characteristics of the study area. Also, huge amount of precipitation in short time and uncontrolled and unplanned development increase the impact of the flood. The results indicate the presence of two basins in the study area characterized by the possibility of flooding. Accordingly, establishing flood channel, of about 38 km long, is vital to protect the city from flood hazards in the future.

Evaluation of heavy metal mobility in contaminated soils between Abu Qurqas and Dyer Mawas Area, El Minya Governorate, Upper Egypt

المجلة: Bulletin of the National Research Centre

سنة النشر: 2019

تاريخ النشر: 2019-06-06

Heavy metals have dangerous effect on the biota. So, this work aimed to determine the mobility and bioavailability of these metals through the application of pollution indices and geochemical fractionation technique. Thirty-one topsoil samples (20 cm) were collected from the area between Abu Qurqas and Dyer Mawas, El Minya Governorate, and subjected to chemical analysis. Results The results revealed that Cd and As are mainly associated with carbonate fraction while Cr, Pb, Ni, and Cu are more present in the residual fraction. The relative amounts of easily dissolved phase of heavy metals in the soils are in the order of As > Cd > Cr > Pb > Ni > Cu. Conclusion The results revealed that As, Cd, and Cr have high mobility and risks more than Pb, Ni, and Cu metals in the studied soils. As, Cd, and Cr were the heavy metals that caused pollutants in the soils of the studied area.

Evaluation of human risks of surface water and groundwater contaminated with Cd and Pb in the southern El-Minya Governorate, Egypt

المجلة: Drink. Water Eng. Sci.,

سنة النشر: 2019

تاريخ النشر: 2019-06-19

Water pollution with cadmium (Cd) and lead (Pb) is a worldwide concern because of their health impact. Determination of their concentrations and potential human health risks in surface water and groundwater in the southern El-Minya Governorate, Egypt, is the main aim of this study. Fifty-five samples were collected, 30 surface water samples and 25 groundwater samples. The samples were analyzed using atomic absorption spectrometry to determine Cd and Pb contents. Their levels in surface water and groundwater exceeded the maximum allowable level for drinking water set by the World Health Organization (WHO). The hazard quotient showed that the surface water and groundwater may pose a health risk to residents, especially to children.

Evaluation of Heavy Metals Pollution by Using Pollution Indices in the Soil of Assiut District, Egypt

المجلة: ejchem.journal

سنة النشر: 2019

تاريخ النشر: 2019-09-21

ASSIUT District represents an important part of central Nile Valley. It is a complex district containing many big industries, urbanization and agricultural activities. These activities can lead to the pollution of agricultural soil with toxic heavy metals. The aim of this work is the assessment of potential risks of these metals in soils using pollution indices; Enrichment Factor (EF), Index of Geoaccumulation (Igeo), Contamination Factor (CF), Ecological Risk Factor (Er), Degree of Contamination (Cd), Pollution Load Index (PLI) and Potential Ecological Risk Index (PERI). The present study calculated the mentioned indices for eight heavy metals; As, Cd, Co, Cr, Cu, Ni, Pb, and Zn. Pollution indices calculations revealed that the investigated area can considered generally moderately polluted with the studied heavy metals. The emission of heavy metals from the factories as well as agricultural practices, urban runoff and sewage stations in the zone may be the source of that pollution. Consequently, control methods must be functional to the area adjacent to the factories to diminish the pollution. Finally, the studied cultivated soils showed low pollution than other cultivated soils in Australia, Canada, Germany, Tanzania, Netherlands, USA, as well as other areas in Egypt.

Geochemical characteristics of agricultural soils, Assiut governorate, Egypt

المجلة: Bulletin of national Research Centre

سنة النشر: 2019

تاريخ النشر: 2019-03-12

Background The geochemical investigation of agricultural soil is a great demand because of its help in the characterization of soil and its suitability for cultivation. The urbanization, cultivation, and industrial activities at Assiut Governorate have adversely impacted the chemical composition of soil, especially its content of heavy metals. The study area includes El-Madabgh sewage station and many big industries; cement, fertilizers, and pharmaceutical. Results The Nile Valley soils are very comparable in composition and composed mainly of SiO2, Al2O3, Fe2O3, CaO, MgO, and TiO2 which represent about 88% of its chemical composition. The chemical composition gave an indication about the mineralogical assemblage of soil; quartz, clay minerals, and calcite. The results pointed to the mixed source (geogenic and anthropogenic) of Fe, Co, Cu, Ni, Zn, Zr, and Cr and the anthropogenic source of As, Pb, and Cd (especially phosphatic fertilizers) in the studied soil. Conclusion The studied soil chemistry affected mainly by the agricultural practices (application of fertilizers, pesticides, manure, and wastewater irrigation), industrial inputs, and atmospheric deposition. Generally, the Egyptian soil needs more geochemical studies to monitor its quality and enhance of its productivity.

Geochemical, mineralogical and pollution assessment of River Nile sediments at Assiut Governorate, Egypt

المجلة: Journal of African earth sciences

سنة النشر: 2021

تاريخ النشر: 2021-08-01

River sediments have great impact on water and aquatic life quality. Geochemical and mineralogical composition of River Nile sediments (13 samples) were investigated to differentiate between geogenic and anthropogenic sources of harmful elements at Assiut Governorate, Egypt. The Sediment Quality Index (SQI) and pollution indices were applied. Mineralogically, sediments composed mainly of Quartz (72.3%) followed by Na-albite, anorthite and montmorillonite. Chemical composition is governed by SiO2 (62.57%) supporting mineralogical composition. Geochemical interrelation indicated the anthropogenic source of As, Cd, and Co as well as the mixed source (geogenic and anthropogenic) of Cr, Cu, Ni, and Zn. Pollution indices showed the minor enrichment of sediments with Cd, Zn, and Cr, moderate pollution with Ni and moderate to severe pollution with Co. Based on SQI, the sediments generally were of good quality with only emerged harmful impact of Cr. Finally, the Nile Sediments quality must be monitored regularly to emphasize the protection of the Nile's environment.

Mineralogical and petrographical studies of agricultural soil, Assiut

المجلة: Bulletin of national Research Centre

سنة النشر: 2019

تاريخ النشر: 2019-12-21

Abstract Background: The lack of information about the Egyptian soil needs more attention, especially mineralogical, petrographical studies, and quality data. Thus, the aim of this study was to evaluate the physicochemical parameters of north Assiut agricultural soil; pH, moisture%, CaCO3%, organic matter (OM%), and mineralogical contents of the studied soil. Results: The studied soil is characterized by alkaline nature, low organic matter, and high CaCO3%. Mineralogically, the studied agricultural soil samples consist mainly of quartz, plagioclase, and minor calcite (as non-clay minerals), as well as montmorillonite, vermiculite, and illite in decreasing abundance order as clay minerals. The plagioclase consists of two minerals; calcined albite and anorthite. Conclusion: The clay minerals in the studied soils may be derived from the old alluvial plain (Plio-Pleistocene sediments) by successive Nile floods and reworking. The recorded clay minerals in the studied soils are montmorillonite, vermiculite, and illite in decreasing order of abundance. They have the ability to retain the irrigation water and adsorb more exchangeable cations in aqueous media which can feed the plants.

Chemical Fractionation and Risk Assessment of Some Heavy Metals in Soils, Assiut Governorate, Egypt

المجلة: Egyptian Journal of Chemistry

سنة النشر: 2021

تاريخ النشر: 2021-07-01

Toxic elements behavior in Egyptian soil need more studies for the enhancement of soil quality and human health protection. The current study focuses on the mobility assessment of chemical species of As, Pb, Cr, Ni, Cu and Co in soils due to anthropogenic emission using sequential extraction (SE) and risk assessment code (RAC). Generally, the studied soils are alkaline calcareous loam soil. It has a low organic matter (OM) that ranges from 1 to 3.8% and is enriched with As, Pb, Cr, Ni, Cu and Co, which preferentially accumulate in soil clay and silt fraction. SE revealed that the non-residual (bioaccessible) fraction contains about (70.7%) As, (65.2%) Co, (58.8%) Cr, (28.4%) Cu, (6.8%) Ni and (64.5%) Pb, indicates the risk of pollution with As, Co, Cr, and Pb. RAC values indicated a high risk of soil pollution with As, medium risk of Co and Pb, low risk of Cu and Ni, and no risk of Cr. The results pointed out the geogenic source of Cr, mixed source of Co, Cu, and Ni and the anthropogenic source of As and Pb. The spatial distribution analyses of these metals indicated the role of urbanization, traffic, and industry on the releasing of toxic metals into the environment.

Appraisal of rock–water interaction and frailty of groundwater to corrosion and salinization, northwestern Gulf of Suez, Egypt

المجلة: Journal of umm al- qura university for applied sciences

سنة النشر: 2023

تاريخ النشر: 2023-08-22

From 12 groundwater samples taken in Egypt's northwestern Suez Gulf, it can be concluded that the water is not suitable for drinking or irrigation purposes. The water is highly mineralized, has extreme hardness, and is very saline, with salinity levels above 3000 ppm. The dominant ions in the water samples are Cl, Na, SO4, and HCO3, and there are two distinct water types: SO4. Ca–Cl (90%), and SO4. Na-Cl (10%). The research also revealed that three wells had become salinized due to dominant ions from sewage water recharge and seawater invasion. The water samples were found to be oversaturated with carbonate, silicate, iron oxide, and evaporite mineral dissolution, which could be harmful to human health. The water was found to exhibit ion exchange, where alkaline earth's (Ca + Mg) ions associated with solids and alkalis' ions (Na + K) in water samples exchange ions. The water was also found to have a high propensity for corrosion, making it unsafe to move groundwater over long distances. The excessive salinity of the water in the research area also makes it undesirable for drinking and irrigation purposes. Overall, the research findings suggest that measures need to be taken to ensure the safety of the groundwater in the area and prevent further contamination. The findings also highlight the importance of regular monitoring and testing of groundwater to ensure that it meets safe levels for human consumption and agricultural use.

Evaluation of Surface Water for Different Uses in the Area Between Abu Qurqas - Dyer Mawas Districts, El Minya Governorate, Egypt

المجلة: IJIST

سنة النشر: 2017

تاريخ النشر: 2017-01-21

Water quality becomes the most demand in the recent years for different uses. Accordingly, thirty samples of surface water have been collected from the study area and were analyzed by using different instruments. The pH and TDS of the studied samples were around 8.16 and 289 ppm, respectively. Generally, this water is considered as earth alkaline water with increased portion of alkalis with prevailing bicarbonate. All the studied ions are within the permissible limits for drinking water except Cd and Pb. The expected sources of Cd and Pb in the study area are agricultural and industrial activities and wastewater. However, it is suitable for irrigation and some industrial purposes.

Appraisal of Heavy Metal Content in The Groundwater at W-W El Minya District of Egypt

المجلة: Egyptian journal of Chemistry

سنة النشر: 2024

تاريخ النشر: 2024-02-10

act In W-W El Minya district, 33 groundwater samples were collected, analyzed, and rated using various indices to assess water quality. The samples exhibited weakly acidic to faintly alkaline pH levels, excessive mineralization, weak to moderate salinity, and high hardness. The prevailing ions in the samples were Cl, Na, HCO3, and SO4 due to silicate weathering and hydrolysis of evaporite minerals. However, the World Health Organization's (WHO) recommended limits for Ca, Na, and Cl contents were exceeded in some samples. Piper's graph showed that all samples were of the SO4. Na-Cl type. Among heavy metals, Cd was the most prevalent, with 36% of samples exceeding the WHO safe level and 18% exceeding Food and Agriculture Organization (FAO) permissible values. The Heavy Metal Pollution Index (HPI) indicated that 48% of samples were suitable for drinking, while the Heavy Metal Evaluation Index (HEI) showed negligible levels of heavy metal pollution. The health risk assessment revealed non-carcinogenic and carcinogenic effects of Cd in the contaminated water. The Corrosion Ratio (CR) index suggested that metallic pipes could contaminate water with heavy metals over time. The Chloride Mass Balance (CMB) approach estimated that groundwater supply in the area was only 20.6% of total precipitation. To prevent adverse effects on residents' health, it is recommended that contaminated water be treated for cadmium pollutants.

Water quality assessment in dry regions using statistical methods

المجلة: Journal of king Saud university- science

سنة النشر: 2023

تاريخ النشر: 2023-07-21

Water demands have increased even more in recent decades because of the high population density. Surface and groundwater resources are insufficient to meet these demands. As a result, governments have turned to the treatment of sewage water. Sewage water contains multiple types of contamination, creating a major health risk. In the research region, 48 water samples were obtained, including 18 samples of surface water and 30 samples of groundwater. The Canadian Council Water Quality Index (CCWQI) program calculates the water quality index to evaluate the water quality for drinking and human use. The World Health Organization (WHO) and the Egyptian Ministry of Health (EMH) determined regulatory limits for drinking water and each value of the investigated parameter connected with them. According to the findings, 79% of the tested water samples are safe to drink and are excellent for human and wildlife use. Due to infiltration or recharging of groundwater with drainage water, as well as the involvement of dissolution, leaching processes, and anthropogenic activities that damage human health, animals, and some plants, these samples are unfit for drinking and domestic consumption. The heavy metal level of Cd and Pb in the examined water samples was found to be above WHO and EMH acceptable limits. Furthermore, due to oral exposures, the examined water samples may cause complex health concerns such as non-carcinogenic and carcinogenic influences for children over adults due to a reduction in children's immunity. As a result, water treatment should be carried out in the examined region to protect the health of the residents.

Simulation of Surface and Subsurface Water Quality in Hyper-Arid Environments

المجلة: Hydrology

سنة النشر: 2023

تاريخ النشر: 2023-04-06

Forty-eight water samples (30 groundwater and 18 surface water samples) were collected from the study region. Physical and chemical examinations were performed on the water samples to determine the values of various variables. Several graphs, sheets, and statistical measures, including the sodium solubility percentage (SSP), the sodium absorption ratio (SAR), and Piper’s diagram, were used to plot the concentration of the principal ions and the chloride mass balance (CMB). The contents of the variables were compared with the contents in other local areas and the standard allowable safe limits as recommended by the World Health Organization (WHO). Water pH values were neutral for all water samples. Electric conductivity (EC) readings revealed that water samples vacillated from slightly mineralized to excessively mineralized. Water salinities were fresh and very fresh according to the total dissolved solids (TDS) amounts. The hardness of water ranged from medium to hard in the surface water and from medium to very hard in the groundwater samples. Bicarbonate, sodium, and calcium made up the highest amounts in the surface water samples. The highest concentrations of bicarbonate, sulfate, chloride, and sodium were found in the groundwater. Diagrams show the major ion relationships as well as the type and origin of the water. According to Piper’s plots, most of the water samples under investigation were Ca-HCO3 type, Mg water types, followed by SO4.Ca-Cl water types. This highlighted the elemental preponderance of bicarbonate and alkaline earth (Ca2+ + Mg2+). This dominance is caused by evaporite and carbonate minerals dissolving in water because of anthropogenic activities and interaction processes. The groundwater recharge was estimated to be 0.89–1.6 mm/yr based on Chloride Mass Balance. The examined water samples can also be used for cattle, poultry, and irrigation. Additionally, the groundwater is of poorer quality than the surface water, although both types of water are adequate for various industries, with a range of 14 to 94 percent. With the exception of a few groundwater samples, the tested water samples are suitable for a number of applications.

Evaluating groundwater quality and salinity dynamics in the Western-west area of El Minya Governorate, Egypt, based on geochemical modelling and multivariate analysis

المجلة: Journal of umm al-qura university for applied sciences

سنة النشر: 2024

تاريخ النشر: 2023-09-28

In the Western-west area of El Minya Governorate, Egypt, the present study investigates the water quality and salinity of 33 groundwater samples. The primary aim is to conduct a comprehensive evaluation of water purity and gain insights into salinity dynamics. The investigation involves a combination of geochemical analysis and multivariate statistics to reveal significant findings that contribute to our understanding of groundwater characteristics in the region. The collected groundwater samples are analyzed to assess various properties, including pH levels, mineral content, hardness, and salinity. The prevalence of sodium (Na) and chloride (Cl) ions emerges as a noteworthy aspect, implying their derivation from deeper aquifers through mechanisms like upward seepage or reverse ion exchange. The observation is validated through Durov's plot analysis. Concerning the suitability of the water for consumption, the study raises concerns. Apart from magnesium (Mg) ions, all other parameters exceed the acceptable drinking water limits defined by the World Health Organization (WHO), indicating potential health implications related to water quality in the region. Furthermore, outcomes from the saturation index reveal an oversaturation of groundwater with evaporites and carbonates, with halite and sylvite minerals standing as exceptions to this trend. Negative chloroalkaline ratios offer insights into the origins of excessive Na and Cl ions in 72% of the samples, pointing towards processes such as rainy recharging and reverse ion exchange as contributors. Gibbs' chart analysis highlights evaporite dissolution as the predominant process influencing water composition. The study also utilizes principal component analysis, identifying the dissolution of halite as the primary source of Na, K, Cl, and SO4 ions, while the presence of calcium (Ca) and bicarbonate (HCO3) ions originates from the dissolution of carbonate minerals, thereby influencing water hardness and salinity levels. Considering the findings, we recommend the dilution of groundwater with fresh water, assuming the absence of additional contaminants. This step is essential for enhancing water safety for drinking purposes. This research not only advances our understanding of water quality and salinity dynamics in the region but also underscores the imperative for implementing sustainable water resource management strategies. Furthermore, we propose that future investigations delve into the broader environmental ramifications of these discoveries, thus contributing to a more holistic comprehension of the complexities associated with groundwater quality and salinity.

STATUS OF SOIL QUALITY ON RECLAIMED LAND IN AN ARID REGION

المجلة: Journal CleanWAS (JCleanWAS)

سنة النشر: 2023

تاريخ النشر: 2023-08-24

The study was conducted in Egypt's El Minya Governorate, where 16 soil samples were taken from reclaimed land and analyzed in the USA using a variety of indices. The study revealed that the soil was moderately alkaline, calcareous, and had salinities ranging from not salty to relatively salty. Most of the soil samples had a clay texture, with varying mineral compositions. The study also found that phosphate fertilizers had been used to improve soil fertility, but it was cautioned against using them due to the low soil fertility and potential for heavy metal contamination. The study also compared the quality index of soil, the ratio of sodium absorption, and the percent of base saturation to determine soil quality and fertility. Finally, the study found that agriculture was more extensive in 2018 and 2020 than in 2022, which could indicate a lack of farming in the current season.

RARE EARTH ELEMENTS IN NILE SEDIMENTS AT LUXOR AND ASWAN DISTRICTS: GEOCHEMISTRY, ENRICHMENT AND ENVIRONMENTAL IMPACT

المجلة: Egyptian journal of Chemistry

سنة النشر: 2024

تاريخ النشر: 2024-02-21

The expansion in the use of rare earth elements (REEs) in last decades has led to the emergence of the problem of soil pollution with these elements and their ecological risk. This research aims to assess soil pollution with REEs in Aswan and Luxor districts, Egypt, and their ecological risk. Agricultural soil samples were collected and prepared for mineralogical and chemical investigation. Pollution indices were applied to investigate the degree and hazard of the occurrence of these elements in the study areas. Mineralogically, the studied soils composed of montmorillonite and kaolinite as clay minerals as well as quartz and calcian-albite. The recorded average ƩREEs concentration was 160.8 and 248.3 μg/g for Aswan and Luxor; respectively. Both regions have the same trend, Ce is the highest recorded element and Pr is the lowest. The REEs are most probably derived from the phosphate fertilizers and/or Phosphate Mining in El Sebayia. In addition, Sc and Sm are weakly correlated with Al and Fe which indicated that the clay minerals can be play a significant role in their mobilization, as well as iron has the capability of scavenge them in the studied soils in Luxor and Aswan governorates. The contamination factor indicated the low contamination with La and Nd, moderate contamination with Ce, Pr, Sc and Y, as well as considerable contamination with Sm. Gurna and Habo soils (Luxor Governorate) recorded high concentration of REEs than which in Aswan Governorate. REEs haven’t ecological risk in the study areas. Finally, a detailed baseline study about the distribution of potential toxic elements in the Egyptian environmental constituents (soil, water, air and plant) must be done.

Ahmed A. Asmoay, Ibrahim E. Mousa, Walid A. Mabrouk, 2024. Simulation of Rock-Water Interaction in the Southwestern Part of El Minya Governorate of Egypt. Journal of the Geological Society of India. 100(2): 153-304.

المجلة: Journal of the geological society of India

سنة النشر: 2024

تاريخ النشر: 2024-02-16

Twenty-one groundwater samples were picked up from the southwest of El Minya Governorate, Egypt. These samples’ physicochemical characteristics were analyzed. Using a water quality index software (WQI) and the United States Salinity Laboratory (USSL) staff chart, water samples were assessed for drinking and irrigation applications. The interaction between water and rock was assessed using the saturation index (SI), chloro-alkaline indices (CAI), Gibbs ratios (GC and GA), end-member diagram (END), corrosion ratio (CR), factor analysis, and dendrogram. Datasets elucidated that water samples were distinguished by SO42-, Na+, and Cl- dominance, excessive mineralization, hardness, and fresh to slightly saline water. The examined water is divided into two types: SO4. Ca-Cl. Mg (30%) and SO4. Na-Cl (70%). All samples were over-saturated with anhydrite, aragonite, calcite, dolomite, and gypsum minerals except for halite and sylvite minerals dissolution, according to SI. The existence of reversible ion exchange between alkaline earth’s (Ca2++Mg2+) ions in water and alkalis’ ions (Na++ K+) in solids; this is explained by the negative values of the chloro-alkaline indices, which point to recharging from rainfall. The Gibbs diagram showed that the dominant interaction is rock weathering. The silicate weathering and evaporite mineral dissolution control the water composition and salinity, which led to an excess of the dominant ions, as demonstrated by the END. Three wells in the research area are potentially unhealthy and unfit for irrigation and drinking.