SILICA DUST EXPOSURE AND RESPIRATORY EFFECTS IN SEMNAN FERROSILICON WORKERS

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DEHDASHTI A.R.; MALEK F.

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Journal: Koomesh Year:2000 | Volume:2 | Issue:1 Page(s): 33-44

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Information Journal Paper

Title

SILICA DUST EXPOSURE AND RESPIRATORY EFFECTS IN SEMNAN FERROSILICON WORKERS

Author(s)

DEHDASHTI A.R. | MALEK F. | Issue Writer Certificate

Keywords

CROSS-SECTIONAL SURVEYQ3

FREE CRYSTALLINE SILICAQ4

EXPOSURE LIMITSQ4

DUST SAMPLINGQ4

LUNG FUNCTIONSQ4

Abstract

Introduction: To qualify and evaluate workplace exposure to airborne "free crystalline silica dust" in the Ferrosilicon manufacturing plant and to assess pulmonary functions and respiratory symptoms among workers in the industry established four years ago. Attempts were made to investigate whether a four years period of exposure to silica dust may alter lung function values and result in respiratory symptoms. Materials and Methods: Individual monitoring and size-selective gravimetric sampling procedures were used to estimate worker's exposure to total and respirable size dust levels. Gravimetric and x-ray diffraction techniques were used to quantify airborne dust' concentrations and FREE CRYSTALLINE SILICA contents of samples respectively subjects were interviewed by a standardized respiratory questionnaire spirometry tests and chest radiography were taken to evaluate the effects of work place exposure on worker's health. Mean lung function values and respiratory symptoms incidences were compared in studied groups by t-test, chi square and logistic regression analyses. Results: Total gravimetric dust concentrations ranged from 4.1 to 22 mg/m3 while respirable mass fractions ranged from 1.5 to 12.5 mg/m3.Free crystalline silica concentrations in collected dust samples measured at least 1.2% and maximum 6.3%.There were no significant differences in smoking habit, age and years of employment between studied subjects. Forced Expiratory Volume in one second FEV1 (P=0.1) and the ratio of Forced Expiratory Volume in one second to Forced Vital Capacity (P=0.1) were significantly lower in exposed workers than unexposed group, but no differences were found in other lung function values between subjects. Work related respiratory symptoms including pulmonary infiltration, sputum and coughing were slightly more prevalent among workers but the differences were not significant. Conclusion: Current exposure to respirable silica dust is higher than the threshold limit value calculated at 1.1 mg/m3 based on American Conference of Governmental Industrial Hygienists formula. FREE CRYSTALLINE SILICA contents of airborne dust should be considered as a substantial hazardous agent and may alter lung function after short period of exposure therefore engineering preventive measures are needed to minimize the exposure.

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APA: Copy

DEHDASHTI, A.R., & MALEK, F.. (2000). SILICA DUST EXPOSURE AND RESPIRATORY EFFECTS IN SEMNAN FERROSILICON WORKERS. KOOMESH, 2(1), 33-44. SID. https://sid.ir/paper/37405/en

Vancouver: Copy

DEHDASHTI A.R., MALEK F.. SILICA DUST EXPOSURE AND RESPIRATORY EFFECTS IN SEMNAN FERROSILICON WORKERS. KOOMESH[Internet]. 2000;2(1):33-44. Available from: https://sid.ir/paper/37405/en

IEEE: Copy

A.R. DEHDASHTI, and F. MALEK, “SILICA DUST EXPOSURE AND RESPIRATORY EFFECTS IN SEMNAN FERROSILICON WORKERS,” KOOMESH, vol. 2, no. 1, pp. 33–44, 2000, [Online]. Available: https://sid.ir/paper/37405/en

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