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Abdel-Khalek, Amr Adel; Elhadad, Engy; Mamdouh, Samar; Marie, Mohamed Assem Saed

doi:10.4194/1303-2712-v16_2_02

Cited by 15 publications

(10 citation statements)

References 35 publications

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“…Similar findings were observed in tilapia samples, which were taken from a natural lake in Ethiopia by Amanial and Adugna (2016). Abdel-Khalek et al (2016) observed in a study of the metal accumulation in Oreochromis niloticus collected from Nile River in Egypt that the tissues of liver, kidneys and gills were strong bioaccumulators compared to muscular tissues.…”

Section: Heavy Metals In Fishmentioning

confidence: 99%

“…This may be attributed to the abundance of these metals in water and sediments by the approximate pattern. Fish may accumulate metals that enter their bodies either directly via water and sediment or indirectly through the food chain (Abdel-Khalek et al, 2016). Ibrahim et al (2000) and Ibrahim and El-Naggar (2006) observed an obvious correlation between heavy metals concentrations in aquatic organisms and sediments.…”

Section: Heavy Metals In Fishmentioning

confidence: 99%

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Assessment of heavy metals concentration in water, sediment and fish under different management systems in earthen ponds

Shaker¹,

Elnady²,

Abdel-Wahed³

et al. 2018

Egypt. J. of Aquatic Biolo. and Fish.

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The study was conducted in two fish farming systems in earthen ponds located in North-Nile Delta, Egypt. The first system was the feed fish farm that depended on pelleted diet (25% crude protein) as feed input, while the second system was the fertilizer fish farm which used both organic fertilizer and crushed macaroni as supplementary feed. Each system was replicated in four ponds (8400m 2 each). The experimental period lasted from July 2014 to June 2015, including four months overwintering. Nile tilapia (Oreochromis niloticus), mullet (Mugil cephalus) and catfish (Clarias gariepinus) were cultured in each pond at initial weight of 2, 30 and 5 grams, respectively. Water, sediment and fish samples were collected to detect the heavy metals concentration. The results showed that heavy metals concentration in water, sediment and three organs of fish species were significantly (P<0.05) different between the feed and fertilizer fish farms. The pond management affected the content of heavy metals in water, sediments and fish. Accumulation of iron in water, sediment and three organs of fish were higher than other elements. Accumulation of cadmium and lead in water, sediment and three organs of fish were less than other elements. Accumulation of heavy metals in liver and gills were higher than that of muscles in all fish species. Metals concentrations in the edible part of farmed fish were within the permissible level for human consumption proposed by various international standard organizations.

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Section: Heavy Metals In Fishmentioning

confidence: 99%

Section: Heavy Metals In Fishmentioning

confidence: 99%

Assessment of heavy metals concentration in water, sediment and fish under different management systems in earthen ponds

Shaker¹,

Elnady²,

Abdel-Wahed³

et al. 2018

Egypt. J. of Aquatic Biolo. and Fish.

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“…Найчастіше розрізняють розчинну, завислу та седиментовану форми металів, стабільність яких значною мірою залежить від інтенсивності перебігу процесів, що відбуваються у водному середовищі та донних відкладеннях того чи іншого водного об'єкта, насамперед гідролізу, комплексоутворення, адсорбції та осадження (Linnik, 2000). Вказані процеси визначають міграційну рухливість важких металів, перерозподіл між основними компонентами водної екосистеми, біодоступність і токсичність для водних організмів (Fufeyin and Egborge, 1998;Linnik et al, 2012;Abdel-Khalek et al, 2016).…”

Section: рівненський державний гуманітарний університет рівне українаunclassified

“…Разом із тим, загальний вміст мангану порівняно з ферумом у воді, хоча і не значно, але вищий. Загальна концентрація та форми сполук феруму у водних екосистемах залежать від геологічних особливостей водозбірної площі, характеру водообміну та кількості опадів (Romanenko, 2001;Kim et al, 2010;Abdel-Khalek et al, 2016). Ферум потрапляє у водойми з відходами підприємств різних галузей промисловості, сільського господарства та з дренажними водами меліоративних систем (Lim et al, 2012).…”

Section: результати та їх обговоренняunclassified

“…Зменшення концентрації Co у вегетаційний період пояснюється його утилізацією гідробіонтами. У природні води сполуки кобальту надходять у результаті процесів вилуження з мідно-колчеданових та інших руд, із ґрунтів під час розкладання решток рослинних і тваринних організмів, а також зі стічними водами металургійних, металообробних і хімічних заводів (Linnik et al, 2012;Abdel-Khalek et al, 2016).…”

Section: результати та їх обговоренняunclassified

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Seasonal variations in the level of heavy metals in the water of minor rivers

Суходольська

2017

Biosys. divers.

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This article analyses the level of heavy metals (Zn, Mn, Fe, Pb, Co, Ni, Cd) and characteristics of their transportation through the water of minor rivers in Rivne region, Ukraine. The levels of Zn, Cu, Mn, Fe, Ni, Co in the waters of these fisheries exceeded the maximum permissible concentration limit in different months. We found that the concentration of Pb and Cd did not exceed the permissible concentration limit in the waters of the fisheries during the year of research, while the level of other metals exceeded the permissible levels by 1.1 to 151.0 times. This research confirms that the surface waters of Rivne region are characterized by high concentrations of iron, manganese, zinc, and nickel. The level of iron exceeded the maximum permissible concentration limit by 1.1 to 5.0 times, the level of zinc by 1.5 to 15.0 times, that of manganese by1.3 to 6.7 times and the nickel level by 1.3 to 151.0 times in the fishery waters. In principle, the increase in the level of heavy metals (Zn, Cu, Mn, Fe, Ni, Co) is connected with the lithological composition of reservoirs in the water-collecting areas of the investigated rivers, and besides with the significant influence of the anthropogenic load (fuel combustion, aqueous wastes of factory units, agricultural effluent, etc.), and with the increase in aquatic vegetation, pH balance, temperature change and so on. The appearance of iron-manganese compounds can be explained by natural causes such as reformation of the source minerals into secondary minerals in the conditions of pH level recession in water, which causes the release of these molecular entities; leaching of iron from the iron-manganese septarian nodules, a substantial amount of which is contained in the illuvial horizon. The increase in the level of zinc and nickel in the river water is connected with the leaching of these elements from subsurface rocks, soil and forest leaf litter. Atmospheric condensation is a significant source of the presence of nickel in the surface water. For the investigated rivers, the most significant factors in the water's chemical composition are physiographic (foremost, the character of the soil cover, intensivity of erosion, extent of forest and swamp cover) and anthropogenous impact. In the rivers of Rivne region high concentrations of heavy metals are the consequence of the long-term aggradation of abiotic and biotic substances of the water ecosystem. There is a tendency for a reduction in the concentration of most metals in the abiotic substances of the water reservoir during the vegetative season and an increase after the end of this season. This research shows that the high level of contamination of the water of Rivne region's minor rivers by the investigated heavy metal components is caused primarily by anthropogenic factors.

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