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2016 ; 7
(2
): 150-5
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Characterization of Total and Size-Fractionated Manganese Exposure by Work Area
in a Shipbuilding Yard
#MMPMID27340603
Jeong JY
; Park JS
; Kim PG
Saf Health Work
2016[Jun]; 7
(2
): 150-5
PMID27340603
show ga
BACKGROUND: Shipbuilding involves intensive welding activities, and welders are
exposed to a variety of metal fumes, including manganese, that may be associated
with neurological impairments. This study aimed to characterize total and
size-fractionated manganese exposure resulting from welding operations in
shipbuilding work areas. METHODS: In this study, we characterized
manganese-containing particulates with an emphasis on total mass (n = 86,
closed-face 37-mm cassette samplers) and particle size-selective mass
concentrations (n = 86, 8-stage cascade impactor samplers), particle size
distributions, and a comparison of exposure levels determined using personal
cassette and impactor samplers. RESULTS: Our results suggest that 67.4% of all
samples were above the current American Conference of Governmental Industrial
Hygienists manganese threshold limit value of 100 ?g/m(3) as inhalable mass.
Furthermore, most of the particles containing manganese in the welding process
were of the size of respirable particulates, and 90.7% of all samples exceeded
the American Conference of Governmental Industrial Hygienists threshold limit
value of 20 ?g/m(3) for respirable manganese. CONCLUSION: The concentrations
measured with the two sampler types (cassette: total mass; impactor: inhalable
mass) were significantly correlated (r = 0.964, p < 0.001), but the total
concentration obtained using cassette samplers was lower than the inhalable
concentration of impactor samplers.