The long-term application of phosphate fertilizers on vegetable production fields has raised concerns about the potential health risks of heavy metal contamination of crops grown on contaminated soils in the Hamadan province, western Iran. This study found that long-term fertilizer use led to a growing accumulation of heavy metals in soils. High concentrations of elemental As, Cd, Cr, Cu, Pb, and Zn were found in potatoes sampled from overused phosphate-fertilized soils, which increased the daily intake of metals in food. However, the ingestion of potatoes from soils affected by phosphate fertilizers posed a low health risk when compared with the health risk index of <1 for heavy metals. Nevertheless, heavy metal concentrations should be periodically monitored in vegetables grown in these soils. It would also be beneficial to implement effective remediation technologies to minimize possible impacts on human health.
Water pollution due to heavy metals has become a critical problem worldwide. In this study, the removal of chromium(III), cadmium and lead by graphene oxide adsorbent was examined. Graphene oxide nanosheets were synthesized through Hummer's method, and their characteristics were examined using FTIR, XRD, and SEM. The effect of independent variables, pH, contact time and initial concentration of solution on the removal efficiency of Cr(III), Cd 2+ and Pb 2+ was evaluated according to the experimental Box-Behnken Design using response surface methodology (RSM). Applying quadratic model, the adsorption rate of Cd 2+ and Pb 2+ was obtained as 99% and the adsorption rate of Cr(III) was obtained as 98%. ANOVA was applied as statistical analysis of responses. According to FESEM images, the average size of graphene oxide sheets was 1 to 3 µm. After optimization by RSM, adsorption capacities of Cr(III), Pb 2+ and Cd 2+ were found to be 38 mg/g, 136 mg/g and 68 mg/g, respectively. Examination of isotherms suggested that Cd 2+ and Cr(III) adsorptions follow Langmuir, and Pb 2+ adsorption follows Freundlich isotherm. The results showed that graphene oxide has a good effect on removing Cr(III), Cd 2+ and Pb 2+ ions from aqueous solutions. pH of the solution and initial concentration of the contaminant had the highest effect on adsorption of the mentioned heavy metals. The results of RSM analysis showed that the obtained data were in agreement with the predicted model.
Background & Aims of the Study: High concentration of toxic metals in foodstuffs is among the public interest and therefore requires rapid methods to survey the concentration of these contaminants. In the present study, concentration of some heavy metals (lead, copper and arsenic) in Cydonia fruits from Hamadan city market were determined by atomic absorption spectrophotometry.Materials & Methods: To this purpose, heavy metal concentration of 9 fruit samples were surveyed by ICP (710-ES) and compared to specified level by World Health Organization (FAO/WHO). Statistical analyses were done by SPSS 19.0. Results: According to obtained resuls Pb content differed from 0.03 to 0.85 mg/kg, Cu concentration ranged from 0.09 to 0.21 mg/kg, As content has been ranged between 0.6 to 5.4 mg/kg the mean content of all metals in studied samples were lower than MPL. Conclusions: According to our results using of fertilizer, pesticides and contaminated irrigation water has contributed to the elevation of heavy metal concentrations in agricultural soils and products significantly.
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