Volume 14, Issue 3 (Scientific Journal of Hamadan University of Medical Sciences-Autumn 2007)                   Sci J Hamadan Univ Med Sci 2007, 14(3): 67-73 | Back to browse issues page

XML Persian Abstract Print

Download citation:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:

Aliabadi M, Bahrami B, Mahjub H, Ghorbani F, Barghi M A, Golbabaie F. Evaluation of Free Silica Emission in Ambient Air of Stone Crushing in Azandarian Area of Hamadan State by Using of X-Ray Diffraction Method. Sci J Hamadan Univ Med Sci. 2007; 14 (3) :67-73
URL: http://sjh.umsha.ac.ir/article-1-418-en.html

, mohsen_ohse@yahoo.com
Abstract:   (1459 Views)

Introduction & Objective: Determination of free silica to calculate threshold limit value is necessary. The purpose of this research was study of free silica in particulate emission in ambient air of stone crushing workshops in Azandarian area.

Materials & Methods: 40 samples of respirable dust from workplace air were obtained in breathing zone of workers in different job stations. Samples were taken with personal samples pumps attach to cyclones and analyzed by a gravitmetric method and X –Ray Diffraction.

Results: The results were showed that mean concentration of respirable dust and quartz in workshops (type 2) was equal to 1.17-1.24 mg/m3 and 0.94-1.03 mg/m3 respectively, and also in workshops (type 1) was equal to 0.81-1.07mg/m3 and 0.79-1.05 mg/m3 respectively. Free silica rate in ambient air of workshops type1 and type2 was 97.5% and 81.3% respectively. Difference of free silica rate in two types of workshops was statistically significant (p=0.0001).

Conclusion: The comparison of time weighted average of respirable dust concentration with threshold limit value showed concentration of respirable particles was less than threshold limit value.

Full-Text [PDF 229 kb]   (503 Downloads)    
Type of Study: Original | Subject: Special

Add your comments about this article : Your username or Email:
Write the security code in the box

Send email to the article author

© 2015 All Rights Reserved | Avicenna Journal of Clinical Medicine

Designed & Developed by : Yektaweb