Speciation of some heavy metals in River Nile sediments, Cairo, Egypt

Lasheen, Mohamed R.; Ammar, Nabila S.

doi:10.1007/s10669-008-9175-3

Cited by 44 publications

(28 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Almost a similar fraction of copper in the residual phase in the sediments of other rivers has been reported (Farkas et al, 2003;Lin et al, 2003;Singh et al, 2005). In contrast to this, a very high percentage of Cu (44-95%) in the residual phase is reported in the sediments of the River Nile, Egypt (Lasheen and Ammar, 2009) and Seyhan, Turkey (Davutluoglu et al, 2011). A reasonable percentage of Cu in the oxidisable fraction is in accordance to its strong covalent interaction with organic matter.…”

Section: Metal Fractionation In Sedimentssupporting

confidence: 67%

“…The reducible (8.20-28.0%, mean 16.0%) and oxidisable (0.00-13.5%, mean 5.8%) fractions are smaller. A dominance of chromium in residual phase has been reported in several other riverine systems of India (Singh et al, 2005) and world (Lin et al, 2003;Lasheen and Ammar, 2009;Fu et al, 2009;Davutluoglu et al, 2011). Though a major portion of Cr is present in the residual phase still the percentage of Cr in the non residual forms collectively is significant and chances of its leaching from the sediments as a result of slight environmental perturbation cannot be ignored.…”

Section: Metal Fractionation In Sedimentsmentioning

confidence: 97%

See 1 more Smart Citation

Trace metal fractionation in water and sediments of an urban river stretch

Kumar

Rani

Gupta

et al. 2014

Chemical Speciation & Bioavailability

View full text Add to dashboard Cite

In this study, the fractionation and ecotoxic potential of Cr, Ni, Cu and Pb in water and sediments of the river Yamuna (Delhi stretch) is presented. The river water is used for various purposes such as irrigation, industrial, domestic and drinking. The investigations suggest that the availability of metals in water follows the sequence Ni>Cr>Pb>Cu whereas a different pattern (Pb>Cu>Ni>Cr) is observed in sediments. Statistically significant spatial variations are indicated by two-way ANOVA in different geochemical forms of the metals and physicochemical parameters of water and sediments of the river Yamuna. Principal component analysis (PCA) suggests a similar source for all four metals probably from the sewage from municipal drains. PCA also indicates some independent sources of Cu and Pb. The hot spots were identified using hierarchical cluster analysis considering bioavailable forms of the metals in water and sediments as objects and the sampling sites as variables. Risk assessment code analysis indicates that metals generally pose medium to high risk at different sites. However, at a few locations either Ni or Pb cross the level of very high ecological risk.

show abstract

Section: Metal Fractionation In Sedimentssupporting

confidence: 67%

Section: Metal Fractionation In Sedimentsmentioning

confidence: 97%

Trace metal fractionation in water and sediments of an urban river stretch

Kumar

Rani

Gupta

et al. 2014

Chemical Speciation & Bioavailability

View full text Add to dashboard Cite

show abstract

“…Water pollution is mostly caused by human activities (Hammer 1986). The major ones are dumping of industrial, domestic, and municipal wastewater and drainage of agrochemicals from agriculture fields in water channels, such as lakes, streams, and rivers (Kahlown and Majeed 2003;Lah et al 2004;Lasheen and Ammar 2009). An estimated 2 million tons of sewage and other effluents are discharged into the world's waters every day.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of various parameters in Euglena gracilis to short-term exposure to industrial wastewaters

Azizullah

Richter

Häder³

2011

J Appl Phycol

View full text Add to dashboard Cite

Due to the presence of various potential pollutants industrial wastewaters pose considerable threats to natural waters and make it unfit for the aquatic biota. Analysis of wastewaters by chemical methods is a common practice; however, it does not reflect the toxic effects on living organism. Therefore, bioassessment is necessary for monitoring of wastewater quality. In the present study, the toxic effects of wastewater samples from different industries were evaluated using Euglena gracilis as a biotest organism. Various parameters of the freshwater flagellate E. gracilis like motility, swimming velocity, cell shape, gravitactic orientation (using the automatic biotest ECOTOX) and photosynthetic efficiency (using a pulse amplitude modulated fluorometer) were used as end points for toxicity assessment. In addition, the samples were analysed for some ecologically important physicochemical properties. With some exceptions, most of the physicochemical properties of the tested samples were within the acceptable range of national environmental quality standards for municipal and industrial effluents. However, all the water samples adversely affected different parameters in E. gracilis. This study led to the conclusion that different toxic substances present in wastewater, even at low concentrations, can be a possible threat to aquatic biota. The results of this study prove that ECOTOX is a sensitive, easy, and fast bioassay for monitoring of water and wastewater quality. Gravitactic orientation and cell compactness of E. gracilis were the most sensitive parameters to wastewater toxicity.

show abstract

“…Sediments are basic components of water environment as they provide nutrients for living organisms and serve as sinks for deleterious chemicals (Gómez-Ariza et al 1999). On the other hand, sediments also constitute a major source of persistent bioaccumulative toxic chemicals which may pose threats to ecological and human health even after contaminants are no longer released from point and nonpoint sources (Lasheen and Ammar 2009). Thus, heavy metal contamination in sediments can critically degrade aquatic systems (Charkhabi et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Probabilistic ecological risk assessment of heavy metals in sediments from China’s major aquatic bodies

et al. 2015

Stoch Environ Res Risk Assess

View full text Add to dashboard Cite

An overall and comparative ecological risk assessment of heavy metals (including Cd, Cr, Cu, Pb, Zn, Hg and As) in surface sediments from China's eight major aquatic bodies was conducted to better understand their potential risks on a national scale. By applying the joint approach of Hakanson risk index (RI) and Monte Carlo simulation, ecological risk in this work is expressed as probability distribution of RI values instead of single point calculations to reflect the uncertainties in risk assessment process. The results show that the highest ecological risks posed by heavy metals existed in Xiangjiang River and Dianchi Lake. Although only a slim margin of high risk (651.88/600 = 1.08 and 700.61/600 = 1.17) was identified based on average RI values, the probabilities of high risk level derived from Monte Carlo simulation reached as high as 56.7 and 52.9 % in these two aquatic bodies, respectively. And the probability of low risk level was less than 1.6 %. Furthermore, the risk was mainly contributed by Hg and Cd, discharged through local intensive mining and industrial activities. The findings indicate that rigid control and effective management measures to prevent heavy metal pollution are urgently needed in China, especially for the high-risk aquatic bodies. This study shows that the joint approach can be used to identify the high risk water bodies and the major metal pollutants. It may avoid overestimating or underestimating the ecological risk and provide more decision-making support for risk alleviation in the polluted aquatic bodies.

show abstract

Speciation of some heavy metals in River Nile sediments, Cairo, Egypt

Cited by 44 publications

References 24 publications

Trace metal fractionation in water and sediments of an urban river stretch

Trace metal fractionation in water and sediments of an urban river stretch

Sensitivity of various parameters in Euglena gracilis to short-term exposure to industrial wastewaters

Probabilistic ecological risk assessment of heavy metals in sediments from China’s major aquatic bodies

Contact Info

Product

Resources

About