The effectiveness of construction waste management and its relationship with project performance

Risk Assessment of some Heavy Metals from Claris gariepinus (African catfish) Consumed in Sharkia Governorate, Egypt

“…These results were lower than 0.66, 0.49, 0.78 and 0.55(mg/kg) in Claris gariepinus from Aswan, Kena, Damietta and Rosetta, respectively [20]. The mean Cd concentration in Claris gariepinus from Abou Hammad was lower than 0.20 mg/kg in Claris gariepinus from Assiut and 0.354 mg/kg from Beni-Suef [20]. Lower Cd concentrations (0.033 ± 0.005 ppm) in Nile catfish (Claris gariepinus) was reported by Hashim et al [21] Higher concentrations of Pb can be observed in aquatic organisms due to anthropogenic sources.…”

“…Fish samples that collected from Faqous city mainly were reared in fish farms using the Bahr El-Baqar water, which had the highest metal accumulation because it is the most polluted area that receives more industrial, domestic and agricultural drainage water than other areas. These results were lower than 0.66, 0.49, 0.78 and 0.55(mg/kg) in Claris gariepinus from Aswan, Kena, Damietta and Rosetta, respectively [20]. The mean Cd concentration in Claris gariepinus from Abou Hammad was lower than 0.20 mg/kg in Claris gariepinus from Assiut and 0.354 mg/kg from Beni-Suef [20].…”

“…Shaltout et al [22] recorded lower Pb concentrations in Claris lazera from Shebin El-kom, Menofia Governorate (0.14 ± 0.02 mg/ kg), 0.045 ± 0.002 ppm from different fish markets [21] and 0.19 to 0.29 from Rosetta branch, River Nile, Egypt [23]. However, higher lead residue levels (7.11, 7.48, 5.895, 6.72, 14.51, 14.10 mg/kg) were detected in catfish (Clarias gariepinus) from Aswan, Kena, Assiut, Beni-Suef, Damietta and Rosetta, respectively [20]. These differences in Pb concentration from other studies may be attributed to the variations in the environmental contaminations [24].…”

“…The mercury concentration levels of examined Claris gariepinus were in the order of Zagazig > Abou Hammad> Faqous fish markets. These results were higher than 0.040 ± 0.001 ppm in Nile catfish from different fish markets [21] and 0.00087, 0.00017, 0.00067, 0.0012, 0.0046, 0.015 (mg/kg) in Claris gariepinus from Aswan, Kena, Assiut, Beni-Suef, Damietta, Rosetta, respectively [20]. The high levels of Hg reflect the increased use of mercury in agricultural and industrial activities in the studied area as fish has the ability to accumulate the residues of these toxic metals [35].…”