Trace Metal Levels in Water, Fish, and Sediment From River Nile, Egypt: Potential Health Risks Assessment.
ABSTRACT The purposes of this study were to describe the impact of metal pollution on the main economic fish species Tilapia nilotica and to assess the potential health risk from consuming this contaminated fish in Egypt. Trace metals, including Ag, Al, Cd, Bo, Co, Cr, Cu, Fe, Mn, Mo, Ni, Pb, St, V, Zn, and As, were determined in water, Tilapia nilotica, and sediments from the River Nile, Domiate branch, Egypt. Metal concentrations in fish of Al, Cd, Co, Fe, Mn, Pb, V, and Zn (mg/kg dry weight [dw]) and concentrations in sediment of Cd, Co, Cr, Cu, Mn, Ni, Pb, V, and Zn (mg/kg dw) were above the International Atomic Energy Agency (IAEA-407) levels. However, trace metals in river water were still at permissible levels for Egyptian standards. The hazard index (HI) of estimated metal mixtures for intake of Tilapia nilotica (23.37) demonstrated that intake resulted in higher noncarcinogenic risk. In conclusion, the overall problem of metal contamination in fish collected from the River Nile was more serious than postulated to occur in an industrialized and densely populated area. In the light of known risks to public health, environmental protection laws are needed in Egypt.
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Journal of Toxicology and Environmental Health Part A 07/2015; 78(13-14):931–944. DOI:10.1080/15287394.2015.1051205 · 1.83 Impact Factor
- "Approximately 2 × 10 7 ha of arable land in China has been contaminated with heavy metals such as arsenic (As), cadmium (Cd), chromium (Cr), lead (Pb), and zinc (Zn) to various degrees, due to local mining and refinery activities (Li, 2005). Accumulation of heavy metals in soils and sediments not only affects soil fertility, crop yield, and quality of agriculture products, but also negatively impacts human and animal health by entering the food chain (Coelho et al., 2012; Dahshan et al., 2013; Figueiredo et al., 2014a, 2014b). Although traditional physicochemical technologies used for remediation of metal polluted soils have been well developed, these approaches have many problems, including high cost, and adverse effect on soil structure, fertility, and biological activity (Holden, 1989). "
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ABSTRACT: A novel two-dimensional carbon-based magnetic nano-material, magnetic graphene oxide (MGO), was prepared and then used as an efficient adsorbent. MGO showed rapid and complete removal of iron(II) (Fe) and manganese(II) (Mn) from micro-polluted water bodies in a wide pH range. After saturated adsorption, MGO could be rapidly separated from water under an external magnetic field. Results of the adsorption equilibrium study indicated that adsorptions of Fe and Mn by MGO were monolayer heterogeneous and spontaneous processes resulting from the heterogeneity of the MGO surface as well as the electrostatic interactions between surface acidic groups of MGO and metal ions. In addition, both the Fe and Mn uptakes of MGO were very slightly affected by NaCl, although they decreased with increased humic acid in solutions. In an Fe/Mn binary aqueous system, both metal ions can be efficiently removed at low concentrations, but MGO showed preferential adsorption of Fe in a concentrated aqueous mixture. The adsorption behavior in the binary system was due to different affinities of surface oxygen-containing functional groups on MGO to Fe and Mn. Finally, unlike traditional approaches in recycling and reusing an adsorbent, the Fe- and Mn-loaded MGO can be directly applied as a new adsorbent to achieve the efficient removal of fluoride from aqueous solutions.ACS Applied Materials & Interfaces 04/2014; 6(12). DOI:10.1021/am502377n · 6.72 Impact Factor
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ABSTRACT: Aloe has been used in versatile herbal medications and nutraceuticals throughout history. Aloe is widely considered to be generally safe for humans and used globally. The effectiveness and pharmacological properties of aloe are dependent upon when the plant is collected. However, little is known about the toxicology of whole-body aloe collected within less than 1 yr. Based upon widespread exposure to aloe, it is important to determine a daily intake level of this chemical to ensure its safety for humans. To determine the no-observed-adverse-effect level (NOAEL) of baby aloe powder (BAP) for clinical application, Sprague-Dawley (SD) rats were treated orally for 4 wk with 4 different concentrations: 0, 0.125, 0.5, and 2 g/kg body weight (bw). In this study, no significant or dose-dependent toxicological effects of BAP were observed in biochemical or hematological parameters, urinalysis, clinical signs, body weight, and food and water consumption. There were changes in some biomarkers in certain treated groups compared to controls; however, all values were within their reference ranges and not dose-dependent. Based on these results, the NOAEL of BAP was estimated to be greater than 2 g/kg bw in male and 2 g/kg bw in female SD rats. Collectively, these data suggest that BAP used in this study did not produce any marked subacute toxic effects up to a maximum concentration of 2 g/kg bw, and thus use in nutraceuticals and in pharmaceutical and cosmetic applications at a concentration of >2 g/kg is warranted.Journal of Toxicology and Environmental Health Part A 10/2014; 77(22-24):1319-1331. DOI:10.1080/15287394.2014.951590 · 1.83 Impact Factor