Elahe Jafari Hafshajani; Mehran Hoodaji; Faezeh Ghanati; Yaghoob Hosseini; Vali Alipour
Abstract
Background: Magnetization of water, as a factor that stimulates the other factors related to plant growth, is an affective physical solution on plant resistance and yield.Methods: In this case-control research, the effect of magnetized water on cadmium removal by Lantana camara was investigated. An experiment ...
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Background: Magnetization of water, as a factor that stimulates the other factors related to plant growth, is an affective physical solution on plant resistance and yield.Methods: In this case-control research, the effect of magnetized water on cadmium removal by Lantana camara was investigated. An experiment with completely randomized-block design was done to irrigate the plant pots using 3 levels of water treatment (W1: magnetic, W2: semi magnetized and W3 non-magnetized:) and 4 levels of cadmium 0, 0.5, 1, and 2 mg/L with 3 replications.Results: The results showed that the interaction effects of cadmium levels and irrigation water treatment on soil, shoot, and root cadmium content were significant. The amount of soil cadmium decreased by 39.49 percent by increasing the concentration of metal (2 mg/L) in irrigation water under the influence of magnetized water treatment. Evaluation of cadmium accumulation, adsorption index and transfer factor showed that the highest amount of them in the treatment of 2 mg / l cadmium in the surface of magnetized water was equal to 0.836, 0.034, and 1.654 respectively. The lowest shoot and root cadmium under the influence of magnetic water treatment was 0.559 and 0.303 (mg Kg-1), respectively, which was significant compared to non-magnetized water treatment. The enzyme activity of CAT (Catalase), SOD (superoxide dismutase), POD (peroxidase), phenol, phenoloid, and anthocyanin was increased by applying magnetic water treatment.Conclusion: Magnetized water by increasing the cadmium absorption by plants and stimulating the plant antioxidants had a significant effect on the absorption and transport of cadmium and increased the efficiency of refining plants by Lantana camara plant.
Godswill J. Udom; Oluchi F. Obilor; Uduak P. Ise; Nkechi J. Onyeukwu; Anwanabasi E. Udoh; Ayodeji Aturamu; Omoniyi K. Yemitan
Abstract
Background: Heavy metal contaminations of herbal formulations have constituted a public health challenge in the sub-Saharan Africa region and even in some developed nations. The study aimed to evaluate the public health concerns of chronic exposure to a polyherbal drug suspected to contain heavy metals. ...
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Background: Heavy metal contaminations of herbal formulations have constituted a public health challenge in the sub-Saharan Africa region and even in some developed nations. The study aimed to evaluate the public health concerns of chronic exposure to a polyherbal drug suspected to contain heavy metals. Methods: This is an experimental study. Heavy metals were measured using Solaar-Thermo-Elemental Atomic Absorption Spectrophotometer. Human health risk assessment was estimated by calculating the estimated daily intake, target, hazard quotient (THQ), health index (HI), carcinogenic risk (CR) of exposure to the polyherbal drug. Results: The results showed the presence of metals in this order: Cd<Hg<As<Pb<Zn<Mn<Cu<Ni<Cr 1; HI for adolescents, adults, and geriatrics were >1. Ni and Cr had the highest cancer risk; total cancer risk was above the safe limit. Conclusion: Since herbal medicines/dietary supplements are not under compulsory regulation by international, national, and local health regulatory authorities, these products must be manufactured using the highest manufacturing standards to ensure their safety among the end-users. Our findings suggest the likelihood of significant non-carcinogenic adverse health effects among adolescents, adults, and the geriatric population due to exposure to a mix of toxic metals, necessitating utmost caution on its chronic use. If policy formulations and implementations regarding the safety of herbal medicines and associated products prior to their circulation are ensured, public health will be protected and significantly improved.
Mohsen Dehghani; Fatemeh Mosaferi; Vali Alipour
Volume 4, Issue 3 , July 2016, , Pages 106-110
Abstract
Background: Given that the share of imported rice from India and Pakistan, the current study was conducted to determine the concentration of lead, arsenic and cadmium in the rice imported from the two mentioned countries in comparison to Iranian rice. Methods: This cross-sectional study was conducted ...
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Background: Given that the share of imported rice from India and Pakistan, the current study was conducted to determine the concentration of lead, arsenic and cadmium in the rice imported from the two mentioned countries in comparison to Iranian rice. Methods: This cross-sectional study was conducted in 2014 in Bandar Abbas, using a completely randomized block design. Five samples of each brand (India,Pakistan and Iran) and a total of 75 samples were selected. To measure the amount of arsenic in them, atomic spectrum poll and to determine the amount of lead and cadmium, the graphite furnace atomic absorption spectrometer optical-compliant were used. To analyze the data, we applied descriptive statistics and analysis of variance using SPSS software. Results: The mean of Cd, As and Pb were 0.045, 0.057, and 0.022 mg/kg, respectively. There was a significant difference for Cd in the local and imported rice (P=0.002). Difference for As in the local and imported rice was not significant (P=0.218). A statistically significant difference was found between the imported and Iranian rice (P=0.354). There were no significant differences among all the measured heavy metals in the tested samples of India and Pakistan rice, both legally and illegally (P=0.144). Conclusion: It was found that the rice was contaminated with heavy elements; it is recommended that measures should be taken to promote healthy rice production, including periodic monitoring of heavy metals in the water and rice seeds, establishing an appropriate operating system to reduce heavy metal emissions, using international experiences on the effects and complications of heavy metals in water resources and farming, and performing quality control measures on the imported rice.
Abooalfazl Azhdarpoor; Rabieh Hoseini; Mansoureh Dehghani
Volume 3, Issue 4 , October 2015, , Pages 153-159
Abstract
Background: High amount of heavy metals in sludge is one of the major obstacles to its use on farms. The present study aimed to investigate the possibility of leaching heavy metals from wastewater sludge by Fenton method and determine the optimum level of parameters, such as iron, hydrogen peroxide, ...
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Background: High amount of heavy metals in sludge is one of the major obstacles to its use on farms. The present study aimed to investigate the possibility of leaching heavy metals from wastewater sludge by Fenton method and determine the optimum level of parameters, such as iron, hydrogen peroxide, time, and pH for Fenton reaction. Methods: The effects of various parameters, such as pH (2-9), hydrogen peroxide concentration (0.5-6 g/l), Fe concentration (0.5-4 g/l), and leaching time (5-60 min), were studied. Results: The results showed that the optimal condition for leaching of heavy metals occurred at pH of 2 3, hydrogen peroxide concentration of 3 g/l, iron concentration of 2 g/l, and leaching time of 15 min. Under these optimal conditions, 92% of Zn, 100% of Cd, 100% of Pb, and 80% of Cu were leached from the wastewater sludge. Conclusions: Fenton method can leach heavy metals from wastewater sludge through decomposition of organic materials at H2O2/Fe ratio of 1.5:2.
Amin Falamaki
Volume 3, Issue 1 , January 2015, , Pages 36-44
Abstract
Background: The occurrence of heavy metals in the environment is of important concern due to their toxicity and health effects on humans, including cancer. Because metals have been extensively used for centuries in commerce, environmental contamination is widespread; moreover, exposure to metals and ...
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Background: The occurrence of heavy metals in the environment is of important concern due to their toxicity and health effects on humans, including cancer. Because metals have been extensively used for centuries in commerce, environmental contamination is widespread; moreover, exposure to metals and metal compounds continues to be a significant public health problem. Electroplating sludge contains heavy metals. Solidification/Stabilization can be used to avoid leaching of these metals to the environment. The aim of this study was evaluating the effectiveness of the application of dicalcium phosphate (DCP) and sodium tripolyphosphate (STPP) on Cd, Co, Cu, Ni, Pb and Zn immobilization in dewatered metal plating sludge.Methods: The ratios of STPP and DCP per dry plating sludge were determined to be 0.1%, 0.2% and 0.5% by weight. Metal leaching from the solidified plating wastes was assessed using the toxicity characteristic leaching procedure (TCLP). The results showed that the concentration of metals in untreated sludge were appropriate to classify this sludge as a hazardous waste as described in The Code of Federal Regulations (CFR) 40 CFR 261.24.Results: DCP and STPP lowered the concentration of metal in the effluent. Increasing DCP concentration from 0.1 to 0.5% decreases the contaminant concentration in the effluent. F or Cd, Pb, Cu and Ni increasing the percentage of STPP in the sludge increases the contaminant’s concentration resulting from TCLP extraction.Conclusion: Immobilization of heavy metals was more effective through application of DCP rather than STPP. Moreover, it may minimize the potential risk of groundwater eutrophication connected with the application of highly soluble phosphate like STPP.