جستجوی مقالات مرتبط با کلیدواژه « heavy metal » در نشریات گروه « پزشکی »

This study aimed to investigate the concentration of potentially toxic elements (PTEs) including iron (Fe), zinc (Zn), copper (Cu), cadmium (Cd) and lead (Pb) and determine their health risks, and evaluate the water quality of Abbas-Abad, Khako, Moradbeig Valley rivers and Ekbatan Dam inlets and bodies located in Hamadan, Iran.

In spring 2019, the concentrations of PTEs in water samples collected from 61 stations were quantified using an inductively coupled plasma optical emission spectrometry device. Water quality was evaluated using heavy metal pollution index (HPI), heavy metal evaluation index (HEI), contamination degree , heavy metal toxicity load (HMTL), and environmental water quality index (EWQI) indices. Carcinogenic and non-carcinogenic risks were calculated usingcancer risk (CR) and hazard index (HI), respectively.

It was found that the average concentration of Fe and Zn had a statistically significant difference (P < 0.05). By comparing the metal concentration to the World Health Organization’s standard, the concentrations of all elements were below the permissible limit, except for Fe and Cd, in 4 and 5 sampling stations. The quality of water sources revealed a low level of PTE contamination in the studied surface water. According to the HI results, there was no apparent threat to the residents’ health. Based on the CR assessment results, the dermal absorption of PTEs for both age groups was classified as low-risk. However, ingestion of these elements was categorized as high-risk.

Since Hamdan’s surface water sources are contaminated with PTEs, it is necessary to investigate effective management strategies for preserving the integrity and health of water resources.

Medicinal plants and herbal medicines are usually safer than chemical medicines, but their arbitrary use may be associated with side effects. Some people think that medicinal plants and medicines that have a plant base cannot cause health problems and are not harmful, while medicinal plants and herbal medicines, like any chemical medicine, have their own side effects. The food chain, including edible and medicinal plants, can be one of the important sources of heavy metals transfer to the human body and endanger human health. The aim of this study is to determine the amount of lead heavy metal in licorice and fennel medicinal plants using furnace atomic absorption spectrometry. The results of this study showed that the average heavy metal concentration of lead in licorice and fennel was 21.63 ppb and 23.45 ppb, respectively. The results obtained in this study are higher than the limit set by WHO. Based on the results, consumption of licorice and fennel medicinal plants has dangerous health consequences for consumers, especially children and pregnant women. Heavy metals enter the body by consuming food such as medicinal plants, contaminated water and other sources and can lead to toxic effects in different organs. Considering the potential risk of heavy metal contamination for public health and their carcinogenic effects, obtaining information regarding the concentration of heavy metals in medicinal plants can be helpful.

In regions with heightened pollutant concentrations, especially in industrial and urban areas, dust plays a crucial role in carrying complex metal components, posing environmental challenges and health risks. This study utilized pollution indicators and geographic information system (GIS) to delineate the spatial distribution of heavy metals in the Arak plain. Dust samples from 30 stations across the Arak plain were systematically collected through random sampling. Analysis using inductively coupled plasma spectrometry (ICP-OES) allowed the calculation of pollution indices (PI) and the Nemerow Integrated Pollution Index (NIPI) for lead (Pb), zinc (Zn), copper (Cu), nickel (Ni), and iron (Fe). GIS generated spatial distribution maps depicting metal pollution. The average concentrations were 45.5 mg/kg for Pb, 10.7 mg/kg for Zn, 0.47 mg/kg for Cu, 30.8 mg/kg for Ni, and 0.206 mg/kg for Fe. Analysis of PI, NIPI, and spatial distribution maps revealed heightened pollution in the northeast, center, south, and southwest areas of the Arak plain, attributed to human activities like heavy vehicle traffic, high population density, concentrated agriculture, and specific industrial operations. The study recommends mitigation strategies, including biological methods like phytoremediation, promotion of public transportation, mandatory environmental standards for industries, and encouragement of green practices. These initiatives aim to address and reduce environmental pollution in the Arak plain.

This study aimed to determine the maximum concentration of lead in the water and sediments of Hawizeh Swamp during 2020-2021. The ECOFATE model was employed to calculate ecological risk parameters (RQ) along with total dissolved solids (TDS), total suspended solids (TSS), and total organic carbon (TOC) at four stations during summer and winter. Using the framework of environmental fate model of ECOFATE, comprehensive data on hydrological sections, input chemical quantities, chemical characteristics, and ecosystem attributes were measured. The findings indicated that lead concentrations were at the highest level in both sediment and water samples of the wetland across three-dimensional space during summer and winter. TSS, TOC and TDS values were estimated, of which the TDS was used to measure ecological risk due to its higher values. The RQ values of lead indicated high and medium risk within the sedimentary and aquatic environments of the wetland ecosystem, respectively. Statistical calculations further revealed that this wetland was at risk of environmental pollution, posing potential hazards to humans through the food chain. The increase in the biological pollution of this wetland is due to the increase in the population and urban sewage. Therefore, it is imperative to raise public awareness regarding the significance of the wetland and advocate for its regular monitoring.

Heavy metals, such as lead harms animals’ health. The objective of this study was to evaluate the level of Pb pollution in the cities of Golestan and Mazandaran Provinces by measuring Pb concentrations in the blood of brown rats, which serve as omnivorous bioindicators living in the same habitat as humans.

Eight highly populated cities were selected, with 10 rats trapped in each city. Blood samples were taken from the rats, and Pb measurements were done by atomic absorption spectrometry.

All sampled rats were Pb-contaminated. The mean Pb concentrations in different cities of Golestan Province were statistically similar (p > 0.05). In Mazandaran cities, however, significant differences in mean Pb concentrations were observed. The highest contamination was recorded in Neka (10.28 ± 0.97 μg/dL), while the lowest contamination was observed in Babol (7.3 ± 1.36 μg/dL). The mean Pb concentrations in the studied cities of Golestan (9.43 ± 1.81 μg/dL) and Mazandaran (9.02 ± 1.07 μg /dL) Provinces, as well as in male (10.38 μg/dL) and female (9.25 μg/dL) rats were similar.

The Pb contaminations observed in the sampled rats are indicative of Pb contaminations of the sampled cities and the presence of Pb sources in these areas. It seems necessary to take precautionary procedures to prevent the entry of polluted effluents into the sampled cities and the consumption of Pb-contaminated gasoline in these areas, to prevent Pb contamination of human populations.

The increase of heavy metals concentrations in aquatic and terrestrial environments and their toxicity is of global concern. The bioaccumulation of toxic metals in fish poses a serious risk to human health when consumed. This study assessed the quality of Rabbit fish (Signus Sutor) and their associated health risks from four landing sites (namely Malindi, Mazizini, Kizimkazi and Matemwe) in Zanzibar. The concentrations of toxic metals, including Lead (Pb), Cadmium (Cd), Copper (Cu), Chromium (Cr), Nickel (Ni), and Arsenic (As), in the fish muscle were scrutinized using inductively coupled plasma optical emission spectrometry (ICP-OES). The detected mean concentration (mg/kg) of Pb, As, Cr, Cd, Cu, and Ni at Malindi were 0.25±0.14, 2.22±0.44, 0.02±0.02, 0.01±0.00, 0.02±0.02 and 0.00±0.00 respectively; at Kizimkazi were 0.39±0.39, 2.30±0.44, 0.11±0.01, 0.07±0.04, 0.17±0.13 and 0.15±0.04 respectively: at Matemwe were 0.38±0.12, 0.52±0.14, 0.04±0.02, 0.05±0.01, 0.65±0.21 and 0.09±0.03 respectively; and Mazizini were 0.21±0.12, 5.56±1.37, 0.02±0.02, 0.03±0.01, 0.05±0.02 and 0.15±0.05 respectively. The mean concentration levels detected for all the elements in the fish gathered from all four landing sites were below international and local maximum (FAO/WHO) permissible limits for human consumption, except for Arsenic (As) and lead (Pb). The study also investigated the relationship between fish size and metal concentration which shows a positive correlation for Cu and Ni. However, it was negative for the remaining metals, possibly due to ecological and metabolic differences. The study emphasizes the necessity for regular monitoring of the marine environment and enforcement of hygienic regulations, as well as the treatment of land-based pollutants before they are discharged into the marine environment to protect fish quality.

The contamination of food with heavy metals is a significant concern for humans. Among food products, milk and dairy products have received more attention due to their widespread consumption at all ages, particularly among children. The aim of this study is to determine the concentration of lead and cadmium in milk and dairy products in Zanjan.

132 samples of milk, doogh, yogurt, and cream were collected from Zanjan city during the winter and summer of 2020-2021. The lead and cadmium levels in the samples were quantified using microwave digestion and graffiti furnace atomic absorption spectrophotometry.

The average concentrations of lead and cadmium in traditional milk, industrial milk, doogh, full-fat yogurt, low-fat yogurt, and cream samples were 96.23, 89.91, 78.79, 49.79, 53.74, 106.08, and 2.76, 2.07, 2.59, 1.09, 1.34, 5.60 µg/kg, respectively. The mean lead concentrations in milk and dairy products during winter were significantly higher than those during summer, whereas the mean cadmium concentrations during summer were higher than those during winter for all dairy products.

The lead and cadmium concentrations in most of the samples exceeded the WHO-FAO standards of 20 and 2.6 µg/kg for lead and cadmium, respectively. Therefore, prompt action is necessary to address this issue.

This study focused on the evaluation of the quality of borehole water in Oshodi, Lagos, Nigeria, considering that groundwater serves as the primary source of potable water in the country. However, the vulnerability of groundwater to contamination raises concerns regarding its suitability for consumption.

Water samples were obtained from Okota, Ayo, Osi, Oke-Afa, Ajao, Oshi, and Iso-Aye Streets in Oshodi and assayed for the presence of heavy metals and microorganisms. The heavy metals analyzed in the samples included zinc (Zn), lead (Pb), chromium (Cr), manganese (Mn), copper (Cu), iron (Fe), and cadmium (Cd). Additionally, the water samples were examined for the presence of bacteria, coliforms, and fungi as representative microorganisms. To evaluate the potential health risks associated with the heavy metals detected, non-carcinogenic risks were assessed. This involved determining parameters such as average daily dermal exposure (ADDE), average daily ingestion (ADI), and hazard quotient (HQ). Further, the carcinogenic risks (CR) of the heavy metals were determined.

The analysis of the water samples revealed that the levels of Pb and Mn, exceeded the recommended limits. However, ADI values for these heavy metals were found to be within permissible limits. The HQ of dermal exposure to Zn, Mn, and Pb during the dry season, as well as for Cr, Mn, Zn, and Pb during the wet season, were higher than recommended limits. The CR (dermal) of Pb and Cr during the wet season and Pb during the dry season were also above recommended limits. In terms of microorganisms, the presence of bacteria, coliforms, and fungi in the water samples was found to be within permissible limits.

Given the identified presence of heavy metals exceeding recommended limits and the potential health risks associated with dermal exposure and ingestion, it is evident that the water from the assessed boreholes in Oshodi poses health hazards to consumers. Therefore, it is imperative to implement decontamination measures to mitigate these risks and ensure the provision of safe and potable water to the community.

This study investigated the effect of inorganic and organic sources of iron on Pb availability in soil.

The treatments involved applying organic and inorganic Fe sources at the rate of 0, 30, and 60 kg/ha pure Fe from different sources in the Pb-polluted soil treated with municipal sewage sludge biochar (MSSB). Corn was chosen as the tested plant in this experiment. The plants were collected after 90 days, and the Pb concentration in the soil and plants was determined using atomic absorption spectroscopy (AAS). Further, the plant enzyme activity was determined.

Soil application of ethylenediamine Di-2-Hydroxyphenyl Acetate Ferric (Fe-EDDHA) had the greatest efficiency in reducing the soil and plant concentration. Using 30 kg Fe/ha from Fe-EDDHA relative to iron slag and FeSo4 source significantly decreased the plant Pb concentration by 11.6 and 9.8%, respectively. For ascorbate peroxidase (APX) and peroxidases (POX) enzyme activity, it was decreased by 17.2 and 15.4%, respectively.

Considering the results of this research, using inorganic and organic Fe sources in soil treated with MSSB had a substantial impact in reducing the soil and plant Pb concentration which is an advantage of environmental studies.

 Several contaminants such as trace elements can pollute drinking water sources with subsequent toxic effects on humans. These compounds may also accumulate in target organs and result in carcinogenic reactions.

 The concentrations of heavy metals, including arsenic (As), nickel (Ni), zinc (Zn), aluminum (Al), copper (1), cobalt (Co), lead (Pb), cadmium (Cd), iron (Cd), tin (2), antimony (Sb), chromium (3), and mercury (Hg) were aimed to determine in the drinking water of Tehran, Iran and to assess the carcinogenic and non-carcinogenic risk for consumers.

 A total of 66 tap water samples were collected from 22 regions of Tehran and their heavy metal contents were measured by inductively coupled plasma mass spectrometry (ICP-MS). The non-carcinogenic and carcinogenic health risks were calculated, using hazard quotient (HQ) and incremental lifetime cancer risk (ILCR), respectively.

 The findings revealed that the mean concentrations of measured elements were lower than the maximum permissible limits established by Iranian National Standards, United States Environmental Protection Agency (USEPA), and the World Health Organization (WHO). HQ was less than 1 for all metals except Cr and ILCR was higher than 1× 10-4 for Cr and Cd, which may cause human health risk.

 No carcinogenic effects were posed by heavy metals contamination in the drinking water of Tehran; however, the content of Cr and Cd may cause human health risks because of the high daily intake of tap water throughout the lifetime and the tendency of these metals to accumulate in the human body organs. Therefore, implementing ongoing programs to monitor heavy metals in municipal drinking water and applying appropriate corrective actions to prevent the transfer of these pollutants to drinking water is crucial.

Rice milk is one of the traditional foods in Khuzestan province. Due to the combination of milk and rice, this product plays a major role as a diet for children under two years old and also as a diet for adults. Heavy metals represent a special group of food contaminants and exposure to heavy metals was shown to be directly related to progression of diseases. This study was conducted to determine the concentrations of some heavy metals in rice milk to evaluate whether the concentrations of these elements correspond to the permissible levels of toxic elements in milk and rice in Ahvaz, Khuzestan Province, Iran.

Totally, 50 rice milk samples (25 samples from East Ahvaz and 25 samples from West Ahvaz) were collected. The heavy metals in all samples were evaluated using quantified diffuse spectroscopy (OES) or mass spectrometry (MS).

The mean concentration of the arsenic and lead was above the permissible limit. The average nickel and cadmium concentrations in the samples were below the allowable limit values and no mercury was detected in all samples.

The study results showed that consumption of rice milk did not pose a direct and serious threat to the health of consumers. Future studies and continuous monitoring are necessary to assess the content of heavy metals and the risk of their consumption to the consumer of the rice milk.

Anemia patients are more susceptible to environmental contaminations such as heavy metals. The present study aimed at risk assessment of heavy metals in edible mushrooms and Anemia.The databases searched in those articles were Google Scholar, SID, Scopus, PubMed, Science Direct, and ISI. Related human health risks were calculated using the target hazard quotient (THQ). THQ ratio of Cd, Cu, Fe, Pb, Cr, Ni, and Mn were 3×10−3, 2.31, 8.43×10 −1, 2.35, 2.92×10−1, 6.6×10− 2 and 1.96×10− 1 m m-1 respectively. The highest non-carcinogenic diseases risk for adults were found in Pb (2.35 m m-1) while the lowest value was observed in Cd (3×10− 3 m m-1). The risk of carcinogenicity of lead was at the level of acceptable (10−4 to 10−6 m m-1). There is no concern about the non-carcinogenic risk of consuming heavy metals in edible mushrooms, in Iran except Cu and Pb. In some countries, adults and children can be exposed to non-cancerous foods by eating mushrooms. And can aggravate anemia in the consumer.

Biological adsorption of heavy metals is an effective process for removing heavy metals from aqueous solutions. In this study, the adsorption properties of non-viable Phanerochaete Chrysosporium biomass are studied for biological adsorption of lead ion in both continuous and batch systems. In the batch process, Langmuir, Freundlich and Dobbinin-Radushkevich isotherms are studied. The adsorption kinetics including pseudo-first order, pseudo-second order and intraparticle diffusion models are also investigated. The experimental equilibrium data follow Langmuir, Freundlich and Dobbinin-Radushkevich models. The kinetic data fit well to the pseudo-second order and intraparticle diffusion models. In the continuous system, by studying the Thomas and Yoon-Nelson models it can be concluded that particles of Phanerochaete Chrysosporium are very suitable adsorbents for the adsorption of heavy metal of lead with high efficiency. Increasing input flowrate causes earlier breakthrough point. Thermodynamic calculations also prove that the process is spontaneous and self-healing and positive ∆H indicate process is endothermic.

the Persian Gulf ecosystem is facing degradation, so further degradation must be prevented. The present study was conducted to assess the environmental pollution risk potential of the coastal ecosystem due to heavy metal content in desalination plant’s effluent.

In this cross-sectional study, the researchers selected five stations in the west of Bandar Abbas beach, located at the outlet of desalination effluent canals to the shore, and two stations in the east shore (without effluent discharge) as case and control stations, respectively. The researchers collected 51 Sediment samples and measured heavy metal concentration, using an AA spectrophotometer, and assessed the potential ecological risk. They used SPSS software and the T-test to statistically analyze data.

The concentration means for sediments in case and control stations samples were: 40.63±16.79, 96.64±30.60, 159.74±50.65, 109.22±17.09, 205.35±86.96 mg.kg-1 and 40.15±17.21, 79.16±28.26, 152.43±90.07, 101.82±43.55, and 193.82±112.90 mg.kg-1, respectively for (Pb, Cu, Ni, Cd, and Zn). The ecological risk and Pollution Load Index were (31.72, 35.95, 3.30, 36.96, and 45.61) and (0.62, 0.63, 0.71, 0.68, and 0.9), respectively for metals mentioned order. Individual potential risk for all stations showed a low-risk degree.

Although the heavy metals accumulated in coastal sediments due to the discharge of desalination plant effluents, severe ecological and environmental damage has not occurred. Therefore, there is still time to prevent an environmental catastrophe on the shores receiving desalination effluents. Therefore, it is recommended to all responsible persons to take the necessary measures to monitor and control the plan and reduce the discharge of effluents to the shores.

The present study aimed to evaluate Fatty acid profile and level of heavy metals in the sesame oils consumed in Iran. In total, 30 sesame oil samples were collected from factories (n=20; industrial) and from traditional mills (n=10; non-industrial). Heavy metal content and the FA profile of examined samples oil were determined by ICP-OES and gas Chromatography respectively. Significant differences were observed between the industrial and non-industrial sesame oil samples in terms of the Fatty acid profile and toxic heavy metals contamination. In addition, the fatty acid profile of the industrial and non-industrial sesame oil indicated high levels of unsaturated fatty acids (84.5% and 83.49%, respectively), with the main fatty acids determined to be oleic acid and linoleic acid. The fatty acid profile of the sesame oil samples indicated no adulteration with other vegetable oils. The concentration of lead, cadmium, iron in industrial sesame oil were observed in the range of 0.008–1.33, 0.001–0.04, 0.11–6.74 mg/kg, and in non-industrial sesame oil were found to be 0.00–0.199, 0.01–0.04, 0.8–4.3 mg/kg respectively. In general, lead content was higher than that of the legislation limit of Iran and European Union (0.1 mg/kg). Mercury and arsenic metals no detected in any of sesame oil samples. Mean values obtained in this work for Fe was lower than the maximum values recommended for FAO/WHO (1-1.5 μg/g) and for Cd was agree whit international requirements, the approved content of Cd in oils are: 0.05 μg/g (1). The health risks carcinogenic (ILCRs) and no carcinogenic (HI or THQ) were highly exceeded than threshold value of 1 in the both consumer groups of adult and children. This calls for concern for both adults and children exposed to consume of sesame oil through ingestion. It is necessary to monitor the presence of heavy metal contaminants and the quality of imported sesame seeds prior to oil preparation.