Determination of crystalline silica in respirable dust upon occupational exposure for Egyptian workers

Mohamed, Sabrein H.; El-Ansary, A. L.; El-Aziz, Eman M Abd

doi:10.2486/indhealth.2016-0192

Cited by 11 publications

(9 citation statements)

References 7 publications

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“…the TLV-TWA (0.025 mg/m 3 ) recommended by ACGIH in 2017. These findings are similar to other studies in Iran and other countries (19)(20)(21)(22)(23). Golbabaei et al (2005) conducted a study to assess occupational exposure to crystalline silica in cement manufacturing in Iran.…”

Section: Discussionsupporting

confidence: 87%

Blood Oxidative Stress Levels in Workers Exposed to Respirable Crystalline Silica in the West of Iran

et al. 2019

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Background: Occupational exposure to crystalline silica is still an important health problem, especially in developing countries. Exposure to silica may be associated with the induction of toxic oxidative stress. Objectives: This study was conducted to assess oxidative stress biomarkers in workers exposed to respirable crystalline silica (RCS) in Hamadan city, the west of Iran. Methods: This descriptive-analytical study was conducted on two groups of exposed workers selected from four industries and unexposed office workers in 2017. The analysis of RCS in air samples was done by NIOSH method No. 7602. Malondialdehyde (MDA), total antioxidant capacity (TAC), and catalase (CAT) activity were measured in serum samples. Results: In this study, 48 healthy workers exposed to silica and 47 unexposed workers as controls were selected. The mean MDA levels (26.91 ± 14.26 nmol/mL) and CAT activity (10.83 ± 5.06 U/mL) were higher in the exposed group than in the unexposed group (P < 0.001). However, no statistically significant difference was observed in the TAC levels between the groups and no correlation was observed between exposure to RCS and oxidative stress biomarker levels in exposed subjects. Conclusions: Although there was a significant difference in the oxidative stress levels between the groups, according to other results of our study, it is not possible to claim that oxidative stress biomarkers are appropriate biological indices for silica exposure monitoring in occupational settings. Therefore, we still require a comprehensive study of other aspects of this research field.

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Section: Discussionsupporting

confidence: 87%

Blood Oxidative Stress Levels in Workers Exposed to Respirable Crystalline Silica in the West of Iran

et al. 2019

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“…the fraction of airborne mass that enters the nose or mouth during inhalation and the regional deposition of particles within the respiratory tract. 6 The airborne concentration to which nearly all mine workers may be repeatedly exposed during a normal 8-hour work shift (or a 40-hour work week) is a time-weighted average limit and is expressed either in parts of vapor or gas per million parts of polluted air by volume at 25°C at 101.3 kPa pressure or in milligrams of pollutant per cubic meter of air (mg/m 3 ).…”

Section: Discussionmentioning

confidence: 99%

“…The former is responsible for almost all of the harmful effects of silica owing to its ubiquitous nature, stability, aqueous insolubility and the presence of reactive oxygen species on its surface. 6 Respirable dust has been defined as particles that penetrate into the gas exchange region of the lungs with particulate size less than 5 µ. Inhaled respirable crystalline silica is often the limiting factor in developing lung diseases associated with occupational inhalational dusts, such as pneumoconiosis or associated malignancies.…”

Section: Introductionmentioning

confidence: 99%

Occupational Respirable Mine Dust and Diesel Particulate Matter Hazard Assessment in an Underground Gold Mine in Ghana

Mensah

Mensah-Darkwa

Drebenstedt

et al. 2020

Journal of Health and Pollution

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ResearchBackground. Underground miners can experience occupational health diseases due to exposure to particulate matter hazards. Objectives. The aim of the present study was to examine occupational exposures of underground miners to dust and diesel particulate matter and to identify exposure groups with high potential to develop associated health effects due to the presence of dust and diesel particulate matter (DPM) hazards in an underground gold mine in Ghana. Methods. Purposive sampling was employed using gravimetric air samplers over an 8-hour time weighted average period. The National Institute for Occupational Safety and Health (NIOSH) analytical Chapter Q and 5040 were used in determining crystalline silica dust and diesel particulate matter fractions, respectively. Structured questionnaires were administered to gather data on workers' level of awareness to dust and DPM exposures. Results. It was found that 41% of the sampled groups were exposed to higher crystalline silica levels above the (NIOSH) permissible exposure limit (PEL) level of 0.05 mg/m 3 . For DPM, 49% of these groups had exposures above the Mine Safety and Health Administration (MSHA) PEL level of 160 µg/m 3 . Among the 94 mine workers who responded to this study, 62% were found to be aware of the presence and hazardous nature of silica dust, 28% had minimal knowledge and the remaining were found to be unaware. Conclusions. There are varying levels of dust and DPM due to the presence of silica-bearing rocks, the production of diesel fumes and inefficiencies of available mitigation measures. Research carried out over the past decades has found confirmed cases of silicosis and lung cancer due to high dust exposure levels. Rock drillers, blast men and shotcrete operators were found to be exposed to higher levels of dust and diesel particulate matter and are at greater risk of silicosis.

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“…Crystalline silica is widely used in construction sites and is a natural mineral found in rocks, sand, clay, and gravel. 9 …”

Section: Introductionmentioning

confidence: 99%

Exposure assessment to inhalable and respirable dust in the post — earthquake construction sites in the city of l’Aquila

Mastrantonio

Civisca

Siciliano³

et al. 2021

Journal of Occupational Health

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Objectives Following an earthquake that occurred in middle Italy in 2009, the involved territory hosted in 10 years thousands of construction sites. The aim of this study is to assess inhalable, respirable, and respirable crystalline silica exposure of the construction workers involved in the rebuilding activities. Methods Six construction companies joined the study and hosted the air sampling activities. We identified four work tasks: bricklayer and similar; scaffolder and carpenter; manual demolition; other tasks. We reported 8‐h time‐weighted concentrations. Results The “All tasks” geometric mean concentration of inhalable dust was 4.73 mg/m 3 and the higher, TLV exceeding exposure was observed for “Manual demolition workers” (13.92 mg/m 3 , GM). The “All tasks” geometric mean concentration of respirable dust was 0.25 mg/m 3 and no TLV‐exceeding exposure (geometric mean values) was observed among the work‐related groups. About the respirable crystalline silica dust exposure, the “All tasks” average concentration was 0.004 mg/m 3 . No TLV‐exceeding exposure was observed among the whole data sample. Conclusions The comparison of the results shows that manual demolition workers are exposed to high levels of inhalable dust, exceeding the TLV‐TWA (Threshold Limit Values‐Time Weighted Average) limit of 10 mg/m 3 . About the respirable dust concentration, none of the analyzed work task dust concentrations exceeded the TLV‐TWA limit of 3 mg/m 3 (geometric mean values). Measurements of respirable crystalline silica dust have shown levels below the threshold limit value of 0.025 mg/m 3 . Our findings overall match with the available scientific data.

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Determination of crystalline silica in respirable dust upon occupational exposure for Egyptian workers

Cited by 11 publications

References 7 publications

Blood Oxidative Stress Levels in Workers Exposed to Respirable Crystalline Silica in the West of Iran

Blood Oxidative Stress Levels in Workers Exposed to Respirable Crystalline Silica in the West of Iran

Occupational Respirable Mine Dust and Diesel Particulate Matter Hazard Assessment in an Underground Gold Mine in Ghana

Exposure assessment to inhalable and respirable dust in the post — earthquake construction sites in the city of l’Aquila

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