THE COMPARATIVE ASSESSMENT OF WELDERS’ EXPOSURE TO WELDING FUMES BASED ON MASS AND NUMBER CONCENTRATION

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SAJEDIFAR JAVAD; KOKABI AMIR HOSSEIN; AZAM KAMAL; FARHANG SOMAYEH; KARIMI ALI; GOLBABAEI FARIDEH

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Journal: Journal of Health and Safety at Work Year:2017 | Volume:6 | Issue:4 Page(s): 17-26

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Title

THE COMPARATIVE ASSESSMENT OF WELDERS’ EXPOSURE TO WELDING FUMES BASED ON MASS AND NUMBER CONCENTRATION

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Keywords

INHALATION EXPOSUREQ2

MASS CONCENTRATIONQ2

NUMBER CONCENTRATIONQ2

SHIELDED METAL ARC WELDINGQ2

WELDINGQ2

Abstract

Introduction: Nowadays, WELDING/fa?page=1&sort=1&ftyp=all&fgrp=all&fyrs=all" target="_blank"> SHIELDED METAL ARC WELDING (SMAW) is the most widely used arc WELDING. During the WELDING operation, typically, various harmful agents such as fumes, gases, heat, sound and ultraviolet radiation are produced of which fume is the most important component from the viewpoint of occupational health. The present study aims to compare the number and the MASS CONCENTRATION emitted in SMAW to determine the most appropriate index of exposure to fumes in the WELDING processes.Material and Method: In this study, the portable laser aerosol spectrometer and dust monitor of GRIMM, model 1.106, was used to measure the number and MASS CONCENTRATION of fumes emitted from SMAW on 304 stainless steel with a thickness of 0.4 mm. Air sampling was performed at a distance of 41 cm representing the welder’s breathing zone. The measurements of NUMBER CONCENTRATION (NC) and MASS CONCENTRATION (MC) were taken under the condition of 25 volt voltage and direct current of the electrode polarity.Result: The total NC and MC of WELDING fumes in welder’s breathing zone was 1140451 particles per liter and 1631.11 micrograms per cubic meter, respectively. The highest NUMBER CONCENTRATION was found to correspond to the particles with 0.35 to 0.5 micrometer-sized distribution (NC1; 938976 particles per liter) and the lowest was related to the particles with 5 to 6.5 micrometer-sized distribution (NC7; 288 particles per liter) and the particles larger than 6.5 micrometer (NC8; 463 particles per liter). Moreover, the highest MASS CONCENTRATION was related to the particles with 0.35 to 0.5 micrometer-sized distribution (MC1; 450 micrograms per cubic meter) and the particles larger than 6.5 micrometer (MC8; 355 micrograms per cubic meter). Conclusion: The findings indicated that there is no agreement between number and MASS CONCENTRATION as two particles assessment index, and as the particles’ size become smaller, the mismatch of them is becoming more apparent. Since the smaller particles penetrate into the lower respiratory tract and have higher potential for adverse health effects, it is necessary to measure and assess particles in various size distributions and especially the smaller fraction of particles. Therefore, it is thought that considering the MASS CONCENTRATION alone and not paying attention to NUMBER CONCENTRATION in the assessment of exposure to particles in the industrial workplaces and specifically in WELDING stations will not be reflected valid assessment of adverse health effects of WELDING fumes as a systemic poison on body organs.

Cites

Study of Suspended Air Particles and Health Risk Assessment of Exposure to PM10 and PM2. 5 in One of the Textile Industries

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APA: Copy

SAJEDIFAR, JAVAD, KOKABI, AMIR HOSSEIN, AZAM, KAMAL, FARHANG, SOMAYEH, KARIMI, ALI, & GOLBABAEI, FARIDEH. (2017). THE COMPARATIVE ASSESSMENT OF WELDERS’ EXPOSURE TO WELDING FUMES BASED ON MASS AND NUMBER CONCENTRATION. JOURNAL OF HEALTH AND SAFETY AT WORK, 6(4 ), 17-26. SID. https://sid.ir/paper/235653/en

Vancouver: Copy

SAJEDIFAR JAVAD, KOKABI AMIR HOSSEIN, AZAM KAMAL, FARHANG SOMAYEH, KARIMI ALI, GOLBABAEI FARIDEH. THE COMPARATIVE ASSESSMENT OF WELDERS’ EXPOSURE TO WELDING FUMES BASED ON MASS AND NUMBER CONCENTRATION. JOURNAL OF HEALTH AND SAFETY AT WORK[Internet]. 2017;6(4 ):17-26. Available from: https://sid.ir/paper/235653/en

IEEE: Copy

JAVAD SAJEDIFAR, AMIR HOSSEIN KOKABI, KAMAL AZAM, SOMAYEH FARHANG, ALI KARIMI, and FARIDEH GOLBABAEI, “THE COMPARATIVE ASSESSMENT OF WELDERS’ EXPOSURE TO WELDING FUMES BASED ON MASS AND NUMBER CONCENTRATION,” JOURNAL OF HEALTH AND SAFETY AT WORK, vol. 6, no. 4 , pp. 17–26, 2017, [Online]. Available: https://sid.ir/paper/235653/en

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