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KMID : 0895420140240040478
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Journal of Korean Society of Occupational and Enviromental Hygiene
2014 Volume.24 No. 4 p.478 ~ p.483
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On-site Investigation of Hazardous Substances in Floor Dust of Several Primary Schools
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Kim Ki-Youn
Kim Hyeon-Tae
Lee Kwon-Seob
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Abstract
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Objectives: The main objective of this study is to assess the levels of hazardous substances in floor dust in primary schools located in the city of Busan in Korea.
Materials and Methods: An on-site investigation of three primary schools was performed between April and May 2013. The hazardous substances measured in this study were 14 heavy metals (Cu, Fe, Pb, Mn, Ni, Zn, Cr, Cd, As, Al, Sn, Co, Mo and Si) and the biological agents were bacteria, fungi and endotoxin).
Results: Among the heavy metals, Cd, Co, Pb and Cr were not detected in the floor dust from the three primary schools. The mean levels of other heavy metals were as follows: 20 (±10) ng/cm2 for As, 30 (±20) ng/cm2 for Al, 5 (±4) ng/cm2 for Sn, 20 (±20) ng/cm2 for Mo, 1,340 (±620) ng/cm2 for Si, 110 (±100) ng/cm2 for Cu, 240 (±50) ng/cm2 for Fe, 30 (±30) ng/cm2 for Mn, 10 (±10) ng/cm2 for Ni, and 50 (±30) ng/cm2 for Zn. It was found that mean concentrations of bacteria, fungi and endotoxin in the floor dust of primary schools were 4.7×107 (±2.2×107) cfu/cm2, 6.3×106 (±6.4×106)cfu/cm2, and 8,140 (±5,801) EU/cm2, respectively. The predominant species identified in the floor dust of the primary schools were Pseudomonas spp. for bacteria and Penicillium spp., Cladosporidium spp.,and Aspergillus spp. for fungi, which would be somewhat similar to the microbial distribution pattern of other general environments.
Conclusions: Based on the results obtained from this study, the levels of heavy metals, microbes and endotoxin distributed in the floor dust of primary school were higher than those reported for other general facilities. Thus, preventive measures should be prepared for the health care of children.
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KEYWORD
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Floor dust, hazardous substance, primary school, heavy metal, microbe
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