Mahmoud Mohammadyan; Akbar Ahmadi Asour; Milad Pouransari; Rahim Akrami; Davood Soroosh; Seyyed Mehdi Razavi
Volume 27, Issue 1 , May and June 2020, , Pages 65-72
Abstract
Background:There are many chemicals in Portland cement including crystalline Silica. Workers’ exposure to cement airborne particles containing Free Crystal Silica may cause some serious diseases. This study was carried out to evaluate Free Crystal Silica particle concentration in the workers’ ...
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Background:There are many chemicals in Portland cement including crystalline Silica. Workers’ exposure to cement airborne particles containing Free Crystal Silica may cause some serious diseases. This study was carried out to evaluate Free Crystal Silica particle concentration in the workers’ breathing zone in a cement factory in the Khorasan Razavi province.Materials and Method:The concentration of free Crystal Silica of respirable cement particles was evaluated on 42 sample of workers in different sections of a cement factory in the Khorasan Razavi province in 2018. Sampling of respirable particles was conducted based on standard method of MDHS101/2 recommended by NIOSH, using a personal sampling pump, a cyclone and a filter. Filters were weighed using an accurate microbalance with one microgram precision. Filter was analyzed by XRD method for determination of free crystalline silica. Results:The mean workers’ exposure to cement respirable particles was 3.75±4.09 mg/m3 and the average concentration of free silica in cement respirable particles was 0.12±0.3 mg/m3 in all studied sections. On average, 69 percent of workers were exposed to free silica higher than OEL. Maximum average of exposure to free silica (0.54 mg/m3) was observed in stone crushing section and the minimum average exposure was observed in Raw mill section (0.03 mg/m3).Conclusions:Workers exposure to respirable cement particles and free crystalline silica in respirable particles were higher than national and international exposure limits. There is a relationship between temperature and respirable particle concentration. Regarding high exposure of workers to free crystalline silica respirable particle concentration.
mahmoud mohammadyan; milad pouransari; reza ali mohammadpour tahmtan; Seyyed Mehdi Razavi; Akbar Ahmadi Asoor
Volume 25, Issue 3 , July and August 2018, , Pages 379-387
Abstract
Introduction: Considering the great importance of the workforce’s wellbeing as well as the employment of a large number of workers in the in the cement industries in Iran, the current study was carried out in the aim of evaluation of the respirable dust concentrations in the workers breathing zone ...
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Introduction: Considering the great importance of the workforce’s wellbeing as well as the employment of a large number of workers in the in the cement industries in Iran, the current study was carried out in the aim of evaluation of the respirable dust concentrations in the workers breathing zone in a cement factory in Khorasan Razavi province.Materials and Methods: In this study, respirable particle concentration was evaluated in the breathing zone of 70 workers in a cement factory who were working at different work sites in the cement factory processes. The standard methodology of 0600 recommended by the US NIOSH was followed to determine respirable dust concentration using a personal sampling pump, aluminum cyclone and pvc filter. Results: The average respirable dust concentration was 3.9 mg/m3 for all workers that means 77% of workers were exposed to respirable cement particles higher than. The maximum mean concentration of respirable particles in the workers breathing zone was found in the cement grinding site 9.3 mg/m3 and the minimum one was measured in the stone crushing and mining site 1.8 mg/m3.Conclusion: The average concentration of respirable dust concentration in the workers’ breathing zone was higher than OEL in both warm and cold climates. The warm weather and the wind comes from the desert and dry areas contribute to the increase of the concentration of respirable particles in the breathing zone of the workers in various parts of the plant who are exposed to the naturally ventilated air.
SeyyedMehdi Razavi; Ahmad Bashteni; Shokrollah Zarghani; Yaser Tabaraee
Volume 20, Issue 5 , March and April 2014, , Pages 766-772
Abstract
Introduction: Now a days, musculoskeletal disorders are of a great concern in job health issues and their prevalence are relatively high among various occupations. On the other hand, agriculture is one of the most important production sections which have great roles in creating new jobs, and if these ...
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Introduction: Now a days, musculoskeletal disorders are of a great concern in job health issues and their prevalence are relatively high among various occupations. On the other hand, agriculture is one of the most important production sections which have great roles in creating new jobs, and if these sections pay well attention, it can help in renewing economic growth, independency, and self-efficiency in our country. In the agricultural sections the workers do hard physical jobs, so these persons encounter musculoskeletal disorders more than the others.
Materials and Methods: This descriptive-analytical study was a cross-sectional one which performed among 400 farmers in Sabzevar. The data were gathered through Nordic Standard Questionnaire in which a group of trained persons completed it by interviewing. Gathered data were analyzed through statistical tests by the use of SPSS, v.16.
Results: The prevalence rate of musculoskeletal disorders in one or both knees, the waist and one or both feet and finally the ankle during one year was 52%, 46.5 and 27%, respectively. The result showed that during the last year, there was a significant relation between pain in waist and individuals’ weight (p = 0.033), pain in one or both knees and their age (p= 0.0001), pain in one or both knees and the height (0.036) and pain in shoulders and age (p=0.028).
Conclusion: The results showed that there is a significant relation between the musculoskeletal disorders in farmers and their demographic characteristics like weight, age and the height.
Arash Akaberi; Reza Hekmatshoar; Majid Fallahi; Seyyed Mehdi Razavi
Volume 19, Issue 4 , January and February 2013, , Pages 395-399
Abstract
Background: Musculoskeletal disorders are highly one of the most important occupational health issues in the world, now days. Materials and Methods: A cross-sectional study among 333 mothers' home working carried out. We used modified Nordic questionnaire and information gathered by trained persons. ...
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Background: Musculoskeletal disorders are highly one of the most important occupational health issues in the world, now days. Materials and Methods: A cross-sectional study among 333 mothers' home working carried out. We used modified Nordic questionnaire and information gathered by trained persons. Results: The commonest musculoskeletal disorders were from the low back (49.5%), Resulted showed that between low back , knuckle pain and BMI (P=0.008), between pain and use of stair (p=0.004) were significant relationship. Conclusion: between musculoskeletal disorders and use of devices in the homes were significant relationship.
Majid Fallahi; Seyyed Mehdi Razavi; Aliasghar Khosroabadi; Arash Akaberi
Volume 17, Issue 3 , September and October 2010, , Pages 218-223
Abstract
Background and Purpose: Musculoskeletal disorders among the most important occupational health issues nowadays. As the ministry of health is responsible for the community health and providing better services requires healthy workforce, the present study was conducted to determine the prevalence of musculoskeletal ...
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Background and Purpose: Musculoskeletal disorders among the most important occupational health issues nowadays. As the ministry of health is responsible for the community health and providing better services requires healthy workforce, the present study was conducted to determine the prevalence of musculoskeletal disorders in health-treatment employees at Sabzevar University of Medical Sciences, Iran in 2008. Methods and Materials: This cross-sectional descriptive analytical study was conducted on 364 personnel of health-treatment employees at Sabzevar University of Medical Sciences, Iran in 2008, who were selected through convenient sampling. The disorders were investigated through Nordik Questionnaire including those in 9 body parts within the past week, past year, and falling behind work due to disorders. The obtained data were analyzed in SPSS 13 using independent t-test and correlation coefficient. Results: Mean ± SD and employment period of the participants were 31.81±6.88 and 9.36±7 respectively. The highest prevalence of the past year in all participants was related to their waist (57.8%), knee (44%) and (42.6%). However, in participants working for treatment centers, the figures were 61.6%, 46.9% and 48.6% respectively. In the paramedical employees, disorders of was 29.7% and in health center employees, wrist disorders were 28.4%. Conclusion: The prevalence of disorders in university employees is high and the highest rates are related to waist and knee. Disorders of back, waist, and knee in the treatment center employees, and neck disorders in health center employees were higher.