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ID 16262
Eprint ID
16262
FullText URL
Thumnail 96_327.pdf 4.31 MB
Title Alternative
Studies on biochemical effects of manganese I; Atomospheric levels and phsicochemical properties of manganese in the enviroment
Author
Morita, Keijiro
Abstract
In the present study, the author examined the physicochemical properties and the atomospheric levels of manganese and other heavy metals in the suspended particulate matter of a welding workshop and a residential area neighboring an iron works. α-Fe(2)O(3) and Fe(3)O(4) were the main components of the suspended particulate matter collected in the atomosphere around both areas. The total suspended particulate matter of the welding process (welding TSP) also contained MnFe(2)O(4) formed from Fe(3)O(4) by exchange of Fe with Mn, metalic Mn and an alloy from of Mn-Fe. These findings were obtained by X-ray diffractometry. Observation through the electron microscope showed the presence of fin particles (0.5-1.5μm) in welding TSP, and attention should be given hazards. The concentration of the metals in the welding TSP was about 10 to 30 times higher than that in the covering materials of the welding rods. Exposure levels of manganese in the welding workshop at a breathing zone ranged from 0.4 to 1.0μg/m(3) and the levels were reduced to one tenth by using a welding mask. Levels of manganese have decreased from a maximum median levels of 0.24μg/m(3) in 1971 to 0.15μg/m(3) in 1981. The order of content of the metals in the paticulate matter was: Fe, Cu, Zn, Pb, Mn, V, Ni, and Cd.
Keywords
マンガン気中濃度
化学形態
粒径
溶接作業場
居住地域
Published Date
1984-04-30
Publication Title
岡山医学会雑誌
Publication Title Alternative
Journal of Okayama Medical Association
Volume
volume96
Issue
issue3-4
Publisher
岡山医学会
Publisher Alternative
Okayama Medical Association
Start Page
327
End Page
339
ISSN
0030-1558
NCID
AN00032489
Content Type
Journal Article
Official Url
https://www.jstage.jst.go.jp/article/joma1947/96/3-4/96_3-4_327/_article/-char/ja/
Related Url
http://www.okayama-u.ac.jp/user/oma/index.html
language
日本語
Copyright Holders
岡山医学会
File Version
publisher
Refereed
True
Eprints Journal Name
joma