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Showing 9 results for Rezaei
Leila Rezaei, Vali Alipour,
Volume 2, Issue 3 (Summer, 2015)
Abstract
Background: Traffic noise is one of the major sources of environmental pollution that can cause permanent or temporary loss of hearing in drivers. The purpose of this study was to estimate the prevalence of hearing loss among professional long-distance drivers in Bandar Abbas freight terminal. Methods: One thousand long distance occupational drivers in Bandar Abbas freight terminal not certified by underlying medical conditions were selected for this study. The demographic background, experience, type and kind of vehicles were recorded in a check list. Audiometry test was done at 500, 1000, 2000, 3000, 4000, 6000, and 8000 Hz using Welton 1300 audiometer equipped with AD-19 supra-aural earphones. Statistical analysis was done using analysis of variance (ANOVA). Results: The age, experience, vehicle kind and weight of drivers were 34.02 ± 13.19, 8.21 ± 7.84, and 8.73 ± 6.12 years and 68.30 ± 15.61 kg. Approximately 52% of drivers studied had a degree of hearing loss. The most common type of hearing loss was sensorineural with mild loss of 69% and 70.9% for the left and right ears, respectively. Conclusion: Periodic medical examination with emphasis on the audiometry can be a way of diagnosing hearing loss in the drivers In addition to providing training courses for the drivers on hearing protection, the use of ear muffs equipment in the truck noise can also be considered as a solution.
Masoud Moradi, Aliakbar Dehpahlavan, Roshanak Rezaei Kalantary, Ahmad Ameri, Mahdi Farzadkia, Hasan Izanloo,
Volume 2, Issue 3 (Summer, 2015)
Abstract
Background: Environmental contamination by chromium (Cr) has become an important issue due to its adverse effects on human health and environment. This study was done to evaluate the application of modified bentonite using sulfuric acid as an adsorbent in the removal of hexavalent Cr from aqueous solution. Methods: Adsorbent features were determined using x-ray diffraction (XRD), fourier transformed infrared spectroscopy (FTIR) and scanning electron microscope (SEM) techniques. Thereafter, the effect of pH, contact time, adsorbent dosage and different concentrations of Cr was investigated. The experimental data was fitness in terms of kinetic and equilibrium adsorption processes. Results: The maximum capacity (Qm) of Cr(VI) according to Langmuir model was obtained at 4.21 mg/g. The experimental data properly obeyed the Longmuir and pseudo-second-order models. The highest percentage of Cr(VI) adsorption was observed at pH = 3 and the process after 60 minutes reached the equilibrium state. Conclusion: In Langmuir expression, the dimensionless constant separation term (RL) values for the adsorption of Cr onto the modified bentonite was in the range of 0-1, indicating that the adsorption is a favorable process and the modified bentonite has good potential in removing hexavalent Cr using sulfuric acid.
Mohammad Malakootian, Alireza Mesdaghinia, Shima Rezaei,
Volume 2, Issue 4 (Autumn 2015)
Abstract
Background: Chlorophenols are classified as priority toxic pollutants. These acidic organic compounds present a serious potential hazard for human health and aquatic life. Chlorophenols accumulate in water, soil and air due to high stability, and impart an unpleasant taste and odor to drinking water and can exert negative effects on different biological processes. Among the different methods of removal, adsorption process by low price adsorbents, such as fly ash (FA) is common. Therefore, in this study, the effects of oxidation of FA as modified adsorbent were investigated when the adsorption of 2-chlorophenol (2-CP) was increased.
Methods: This experimental study was conducted from March to September of 2013. FA obtained from Zarand power plant (located in Kerman province) was oxidized with potassium permanganate. Effective factors on the oxidation of FA, such as temperature, oxidation time and concentrations of oxidizers were optimized. Raw sewage of Zarand coal washing plant was tested under optimal conditions. All tests were carried out according to the standard methods book for the examination of water and wastewater.
Results: Optimal condition for the preparation of oxidized FA was obtained at 70°C, 1 hour, and 1 mM of potassium permanganate concentration. The absorber obtained was able to remove 96.22% of 2-CP under optimized conditions (pH=3, 2 hours, adsorbent dose 0.8 g and room temperature). The removal efficiency of the real wastewater under optimal conditions was 82.1%.
Conclusion: Oxidized FA can be used for the removal of this pollutant from industry wastewater due to its high efficiency of removal in real wastewater, it is easy and inexpensive to prepare and could modify the sorbent.
Oshin Rezaei Raja, Soheil Sobhanardakani, Mehrdad Cheraghi,
Volume 3, Issue 3 (Summer, 2016)
Abstract
Background: Fruits especially citrus species are an integral part of human diet. Contamination of foodstuffs by heavy and toxic metals via environmental pollution has become an inevitable challenge these days. Therefore, the effect of pollutants on food safety for human consumption is a global public concern. In this regards, this study was conducted for Al and Cu health risk assessment through the consumption of citrus species (orange, grapefruit, sweet lime and tangerine) in Hamedan city in 2015.
Methods: After collecting and preparing 4 samples from each citrus species with acid digestion method, the concentrations of Al and Cu were determined using inductively coupled plasma optical emission spectrometry (ICP–OES) with three replications. In addition, SPSS was employed to compare the mean concentrations of metals with maximum permissible limits (MPL) of the World Health Organization (WHO).
Results: The results showed that the mean concentrations of Al in citrus samples were 3.25±0.35 mg/kg and higher than WHO maximum permissible limits. The mean concentrations of Cu in citrus samples with 0.16±0.05 mg/kg are lower than WHO maximum permissible limits. Also, the computed health risk assessment revealed that there was no potential risk for children and adult by consuming the studied citrus.
Conclusion: Based on the results, consumption of citrus species has no adverse effect on the consumers’ health, but as a result of the increased utilization of agricultural inputs (metal based fertilizers and pesticides, sewage sludge and wastewater) by farmers and orchardists, regular periodic monitoring of chemical pollutants content in foodstuffs are recommended for food safety.
Javad Kharkan, Mohammad Hossein Sayadi, Mohammad Reza Rezaei,
Volume 6, Issue 1 (Winter 2019)
Abstract
Background: Human activities related to workshops in the cities contribute to the release of heavy metals into the environment, which pose serious risks to the environment and to human health. The aim of the present study was to evaluate the concentration of lead (Pb), iron (Fe), and manganese (Mn) in the pine trees and soil in various land uses of Birjand city, Iran.
Methods: The sampling stations were randomly selected from different land uses including parks, streets, carwashes, car repair shops, and car smooth shops in Birjand city. The pine trees (skin and leaves) and soil samples were collected from 15 stations located at different and uses in 2017. To determine the concentration of heavy metals, atomic absorption spectrometer (Contr AA 700) was used.
Results: It was revealed that the mean concentration of Pb, Fe and Mn in residential soil was 1.79, 419.39, and 30.76 mg/kg, respectively. Moreover, the Pb, Fe, and Mn concentration in pine skin and leaves was 0.63 – 0.18, 23.05–9.84, and 10.05–3.13 mg/kg, respectively. The geo-accumulation index (Igeo) mean of the study areas demonstrated a descending trend for Fe (16.31 mg/kg) Conclusion: According to the results, the soils of car repair and smooth shops as well as carwashes in Birjand are becoming polluted by Pb, Fe, and Mn. Although, it does not threaten the city ecosystem, but with passage of time, these measures will be accumulated due to the soil alkalinity and will reach critical levels.
Leila Rezaei, Mohsen Dehghani, Amir Hesam Hassani, Vali Alipour,
Volume 7, Issue 2 ( Spring 2020)
Abstract
Background: Membrane clogging is one of the most important problem for desalination plant operators in Iran, therefore, this study was conducted to investigate the main causes of this problem using field analysis.
Methods: In this study, six continuous membranes in a reverse osmosis (RO) pressure vessel under the 33-month service period (April 2017 to November 2019) were selected. The membranes were analyzed through visual evaluation of the outer and inner membrane surface, analyzing the damages and physical harms, oxidative stress tests, iron spot test, fouling chemical analysis using loss on ignition (LOI) tests, X-ray fluorescence (XRF), and Fourier transform infrared (FTIR) spectroscopy.
Results: Particle size distribution in raw seawater (EC = 55 000 µs/cm, turbidity = 11 NTU) was 66.4% smaller than 1 µ and 28.3% between 1 to 1.9 µm. Physical damages were not seen on the membranes but telescopic damages were observed which was due to membrane fouling. Removal efficiencies of turbidity and silt density index (SDI) were 84% and 18%, respectively. Membrane oxidation was also seen. Most of the sediments compositions on the membranes were SiO2, Al2O3, MgO, and Fe2O3. Biological fouling was detected on the membranes surface.
Conclusion: Inaccurate use of chlorine neutralizer caused the residual chlorine to be present in the membrane entering water, which damaged the membrane. Accumulation of clogging agents on membrane surface showed malfunction of pretreatment function, therefore, revision of design and operation of units is necessary. Biological fouling is due to non-effective pre-chlorination of drinking water. Metallic compounds sedimentation on the membrane is due to improper use of anti-fouling chemicals. High SDI in the influent shows the need to change the cartridge filters.
Leila Rezaei, Vali Alipour, Parisa Sharafi, Hamidreza Ghaffari, Amene Nematollahi, Vida Pesarakloo, Yadolah Fakhri,
Volume 8, Issue 2 (Spring 2021)
Abstract
Background: The presence of toxic heavy metals in cereal grains like rice is one of the main human and environmental health concerns. Their importance is because of their non-biodegradability nature, high half-time, and bioaccumulation ability in the human body. Among heavy metals, cadmium (Cd), lead (Pb), and arsenic (As) are most critical, so their concentrations in rice were evaluated in this study.
Methods: In this study, the concentration of Cd and Pb was determined by graphite-furnace atomic absorption spectrometer (GF-AAS), while the concentration of As was measured by atomic spectrum poll after acid digestion of the milled rice samples. The probabilistic health risk assessment of Cd, As, and Pb through consumption of different types of rice including local rice and two types imported from India (IND) and Pakistan (PAK), was estimated for the adults in Hormozgan province using Monte Carlo simulation (MCS) technique.
Results: It was revealed that the concentrations of all Cd, As, and Pb in the local rice samples were lower than those in the PAK and IND samples. The average concentration of As, Pb, and Cd in the rice samples were 0.045, 0.057, and 0.022 mg/kg, respectively. The estimated total target hazard quotient (TTHQ) for this population was lower than 1, representing negligible non-carcinogenic risk through rice consumption. However, total carcinogenic risk (TCR) via As intake showed a considerable carcinogenic risk (TCR > 1E-4) for this population.
Conclusion: According to the results, it is necessary to perform continuous monitoring for concentration of Cd, As, and Pb especially in the imported rice samples.
Mohsen Hesami Arani, Roshanak Rezaei Kalantary, Mehnoosh Nasiri, Mahdiyeh Mohammadzadeh, Javad Salmani Arani,
Volume 9, Issue 1 (Winter 2022)
Abstract
Background: During the COVID-19 pandemic, hospitals have been the most important centers for the virus spread. Therefore, this study aimed to evaluate the management of infection control in central corona hospitals in Kashan using the quantitative strategic planning matrix (QSPM) matrix.
Methods: The existing documents studied the strengths, weaknesses, opportunities, and threats of the organization identified by environmental health experts. The internal and external factors were identified as internal factor evaluation (IFE) and external factor evaluation (EFE) matrices, respectively, then, prioritized and weighted. In the next step, the SWOT matrix was formed and the type of used strategy by the organization was determined, and solutions to improve the current situation were presented by experts. Finally, the attractiveness table was compiled and weighted using the QSPM method to prioritize the proposed strategies.
Results: After identifying 25 strengths, 28 weaknesses, 15 opportunities, and 13 threats, weighting was performed, the final score for internal and external factors was 2.6475 and 2.3825, respectively. The final strategy for implementing COVID-19 disease control in the studied hospitals was the Conservative Strategy (WO). Based on this, six control strategies were presented. The priority and attractiveness of each strategy were evaluated using the QSPM matrix. Finally, the strategy of “structuring the system and providing and upgrading the equipment and infrastructure facilities” was implemented as a priority.
Conclusion: According to the results, the combination of SWOT (Strengths, Weaknesses, Opportunities, and Threats) and QSPM methods can play an efficient role in identifying and evaluating the factors affecting the management of the COVID-19 pandemic in hospitals and further developing and prioritizing control strategies for this infectious disease.
Pouria Karimi, Sepideh Sadeghi, Fatemeh Kariminejad, Negin Rezaeiarshad, Yadolah Fakhri, Mohsen Sadani, Farshid Soleimani, Mohammad Sadeghi,
Volume 12, Issue 0 (2025 2025)
Abstract
Background: Prolonged consumption of vegetables containing pesticide residues can pose a risk to the health of individuals over time.
Methods: This study aimed to retrieve the studies on the concentration of pesticides such as acetamiprid, chlorpyrifos, and diazinon in cucumber through a systematic review, and then, a meta-analysis focusing on specific subgroups. Finally, the hazard quotient (HQ) was used to assess the non-carcinogenic risk posed to consumers.
Results: The sequence of pesticides according to pooled (mean) concentration was acetamiprid (140.91 μg/kg) > diazinon (59.03 μg/kg) > chlorpyrifos (40.49 μg/kg). Also, the countries were sorted based on the pooled concentration of chlorpyrifos: Spain (180.00 μg/kg) > Egypt (124.90 μg/kg) > Kazakhstan (49.95 μg/kg) > Greece (20.50 μg/kg) > Saudi Arabia (20.00 μg/kg) > Jordan (3.54 μg/kg) > Iran (3.10 μg/kg). The order for diazinon and acetamiprid was Iran (43.20 μg/kg) > Saudi Arabia (33.00 μg/kg) > China (4.60 μg/kg) and Turkey (231.70 μg/kg) > Egypt (220 μg/kg) > Pakistan (100.00 μg/kg) > Kazakhstan (99.34 μg/kg), respectively.
Conclusion: The HQ of acetamiprid, chlorpyrifos, and diazinon was less than 1 for all countries; hence, the consumption of cucumbers containing these pesticides does not pose a non-carcinogenic risk.
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