Showing 6 results for Naderi
Akbar Eslami, Hamzehali Jamali, Shirin Naderi,
Volume 6, Issue 2 (9-2013)
Abstract
Background and Objectives: Water is essential for sustaining life & adequate safe supplies must be accessible to the public. Nowadays, people prefer to purchase bottled water for reasons including taste, convenience, following fashion, and its safety and sanitary conditions. According to the WHO guideline, it is of great importance to control the bottled water because of keeping it for longer period of time and at higher temperature in comparison with the water of distribution networks, reusing containers and bottles without adequate washing and disinfecting, and more growth of microorganisms having less important in the terms of health. The aim of this study was to investigate the microbial and physicochemical quality of bottled water in the stores of Qazvin City and to compare the aforesaid features with national standards and to check the quality with the bottles label.
Materials and Methods: In this cross-sectional study, 51 samples of 11 bottled water brands with different production date were obtained. The features were studied in accordance with Standard Methods. Then, the data were analyzed by T-Test and one way ANOVA analysis using SPSS software. Eventually, the results were compared with the national standards, the WHO guidelines, and the product labels.
Results: Results showed lack of microbial contamination of the samples. Physically and chemically, all the parameters measured were below the national standards level. Study of conformity of the variables to the label indicated that mostly there was a significant difference between the values measured and the values listed on the product labels.
Conclusion: Although the concentration of microbial, physical and chemical features of samples were in the extent of national standards, there was a meaningful difference between labels and measured values so that the average concentration of TDS, TH, SO4-2, Ca2+, Mg2+ and Na+ would be more than the label values and the average of the other parameters was lower than the label values.
A Naderi, S Nasseri, A.h Mahvi, M.r Monazzam,
Volume 8, Issue 4 (3-2016)
Abstract
Background and Objectives: Due to the increasing use of mobile phone in recent years, the number of BTS antennas has also increased. .Proliferation of BTS antennas in cities and villages, and perpetuation of encountering with waves from one side and increasing the anxiety of many people in encountering with their waves from the other side convinced more investigations in this field. Therefore, the purpose of this study was to investigate the propagation of microwave around the BTS antennas of Maragheh and to compare power density measurements with allowable environmental standards.
Material and Methods: In this research, the frequency of BTS antennas was determined through field monitoring. Then, measurements were performed using a calibrated Spectran 4060 and the standard method IEEE Std C95.1 was adopted in close and far fields from each antenna. Then, the obtained data were analyzed after entering to SPSS environment. In this study, the Kolmogrov-Smirnov test, Kruskal-Wallis, and Mann-Whitney tests were used.
Results: This research found that in both Irancel and Hamrah Aval operators, the power density increased with distance in close fields and decreased in far fields. Moreover, at the distance of 20 meter, the maximum value of power density was measured. Significant difference between these distances was observed (P-value ≤0.05).
Conclusion: Out of 1804 cases in far and close fields, the highest power density measured at 900 MHz band was 4.51 mW/m2, which is in accordance with 0.1% permissible exposure.
V Past, Ar Mesdaghinia, M Naderi,
Volume 9, Issue 2 (9-2016)
Abstract
Background and objective: Compost is beneficial for conditioning the structure and nutrient content of soil. Toxic metals are the most important contaminants that can enter the food chain through the compost products and affect human health. The aim of this study was to assess the arsenic, mercury, cadmium, and lead levels in six brands of vermicompost produced from the organic solid wastes in Tehran and to compare the amounts with the international and national standard levels.
Materials and Methods: This was a descriptive - analytical study in which samples of six brands of vermicompost products were randomly selected from the distribution centers in Tehran, and from each brand four samples were prepared (24 samples). Then the samples were extracted using the TCLP (Toxicity Characteristic Leaching Procedure) method and after filtration the metal concentrations were measured by Inductively Coupled Plasma (ICP). All data were analyzed using Excel software.
Results: The means and standard deviations of the toxic metals concentrations (arsenic, mercury, cadmium, and lead) in the collected samples of each brand were reported in terms of mg/kg. The maximum concentrations of these toxic metals were 7.45, 0.15, 0.19, and 79.95 mg/kg, respectively.
Conclusion: The results indicated that the levels of toxic metals in the vermicompost samples derived from the municipal solid waste in Tehran were lower than the permissible limits of the national and international standards.
V Past, K Yaghmaeian, R Nabizadeh Nodehi , Mh Dehghani, M Momeni, M Naderi,
Volume 10, Issue 2 (9-2017)
Abstract
Background and Objective: Environmental pollution due to dumping construction and demolition wastes has adverse effects on public health. This study aimed to select the best method for managing construction and demolition wastes disposal in Tehran by AHP.
Materials and Methods: This research was a descriptive study. The study population consisted of environmental health experts in the field of construction waste management. Initially, criteria and alternatives for construction waste management, recycling and reuse and landfilling were identified and classified. Using Analytical Hierarchy Process (AHP), different outcomes were compared based on scoring by Expert Choice 11 software.
Results: The results of this study showed that the discharge percentage in the permanent landfills was 68%, in temporary pits was 9% and in recovery centers was 23% in the last 6 years. The final priority of criteria with respect to the economical criterion was reuse (0.492), recycling (0.274) and landfilling (0.235), respectively. Also, according to the environmental criterion, the scores for reuse, recycling and landfilling were 0.492, 0.373 and 0.198 respectively. Based on social criterion the calculated scores were 0.5, 0.279 and 0.222 for landfilling, recycling and reuse, respectively.
Conclusion: In this study, the reuse option with the weight of 0.439 was the best disposal option; and the recycling option with the weight of 0.312 was the second priority. Landfilling showed the lowest score with the weight of 0.250.
Zohreh Naderi, Hiwa Hossaini, Meghdad Pirsaheb, Akbar Barzegar, Sara Kianpour,
Volume 15, Issue 3 (12-2022)
Abstract
Background and Objective: Toluene is one of the most important volatile organic compounds that threaten human health and introduce many environmental problems. Therefore, the present study aims to determine the performance of a biofilter based on pine cones/compost to remove toluene vapors from polluted air streams.
Materials and Methods: In this research, a biofilter with a volume of 19.468 L was designed and built. The biofilter bed consisted of two parts 26 cm in height and packed with a mixture of compost and pine cones in 1:1 volumetric ratio. After inoculating the bed with sludge from a municipal wastewater treatment plant and making it compatible with toluene, the performance of the biofilter in different parts of the bed was investigated at the inlet toluene concentrations of 2.5-5.5 g/m3 and Empty Bed Retention Times (EBRTs) of 1.3, 1.7, and 2.43 min. Also, the results were analyzed statistically.
Results: At EBRT of 2.43 min and different inlet toluene concentrations of 2.5-5.5 g/m3, the removal efficiency reached 100 percent. Also, the removal efficiency decreased with the reduction of EBRT. The results showed that removal efficiency was higher in the first part of the biofilter bed relate to the second part. At an inlet toluene concentration of 2.62 g/m3 and EBRT of 1.7 min, the maximum elimination capacity (ECmax) of 2.74 g/m3.min was obtained.
Conclusion: In all experimental conditions the outlet concentration of pine-cone/compost biofilter was below the WHO standard (260 µg/m3). Also, the high elimination capacity of biofilter verified its capability toward toluene removal from polluted gas streams.
Zabihollah Yousefi, Adel Naderi, Seyed Noureddin Mousavi Nasab, Samaneh Dehghan,
Volume 16, Issue 3 (12-2023)
Abstract
Background and Objective: The high risk of Sars-CoV-2 infection in dental centers is a serious problem for doctors and patients. The main purpose of this study was to investigate the environmental health measures related to corona disease in the dental offices of Sari city during the COVID-19 epidemic in 2021.
Materials and Methods: The present study is descriptive and cross-sectional, and the tool used in it is a researcher-made questionnaire collected with the cooperation of the personnel working in 100 active dental service centers in Sari. to determine content validity, two qualitative and quantitative -qualitative methods were used. The qualitative content validity of this questionnaire was confirmed by 8 environmental health experts. Cronbach's alpha was used to determine the reliability of the questionnaire. Data analysis was done using SPSS software V. 25.
Results: Based on the results of this study, personal protective equipment was used continuously in 100% of the centers. In 93% of the centers, sodium hypochlorite and formaldehyde were used to disinfect the equipment, and in 94% of the cases, the frequency of disinfection of the equipment was after each patient. Disinfection of toilets was done daily in 62% of the centers and every two days in the rest. In 72% of the examined dental centers, had no local hood installed or turned on above the units, but in 92% of the offices, there was proper ventilation of public spaces. In addition, according to the results, in 99% of clinics, waste management was carried out in accordance with national laws and regulations and based on the rules and methods of the executive management of medical waste and related waste and related instructions, and also in 100% of clinics, water consumption was healthy and desirable.
Conclusion: Overall, environmental health measures in dental offices were at an optimal level in most cases and in accordance with the instructions of the Ministry of Health. Not installing a hood or not turning it on above the units and improper ventilation of the dentist's office were the most critical problems of the centers, which need to be given more attention and corrective measures should be taken according to the instructions of the Ministry of Health.
