花むしろ検査所の粉塵

概要

論文の詳細を見る
The fancy mats, which are made of rush, are inspected under the Export Regulation. It is known that the dust raised at the inspecting place is composed of dying clay and basic dyes. We examined dust concentration, percentage distribution of the particle-size, mineral composition of the dust, and we made qualitative as well as quantitative determination of the dyes. The results were as follows; 1) Dust concentration The unloading operation of mats raised the greatest amounts of dust, and the maximum concentration was found at a place far distant from the dust exhaust apparatus. 2) Percentage distribution of the particle-size There was little difference as to percentage distribution of particle-sizes between samples of each piled dust (at three heights of 0, 1.5 and 3.0 meters above the floor) and the floating dust in the air. 3) Dye concentration in the air Eight kinds of basic dyes are used for printing fancy mats. Only the concentration of rhodamine B could be determined by the spectrophotometric method (555 mμ.). By paper-chromatography, rhodamine B and a small amount of auramine O 125 could be separated. The concentration of rhodamine B in the air was from 5 to 7 γ/m^3, and clear difference among kinds of operation was not observed. However, the ratio of the dye concentration in the air to that of the dust showed the largest value in the picking out operation. 4) Chemical analysis of sampled dusts As dusts contain such organic substances as rush, hairs and dyes, they showed of Ig. loss by 13 to 20%. As to the amount of silica in the dust, the floating dust contained more silica than piled dusts. And the higher the place from which the piled dust was taken, the more silica was contained in the dust. 5) X-ray diffraction Reflections of quartz, orthoclase, kaolin, serisite, chrolite, etc. were observed, among which that of the quartz was the strongest. The higher the place from which the piled dust was collected, the more quartz it contained. 6) Free silica Free silica was contained more in the floating dust than in the piled dust. The amount of free silica contained in the dust showed the same tendency as that of substances reveald by the X-ray diffraction and the chemical analysis.
社団法人日本産業衛生学会の論文
1966-07-20

花むしろ検査所の粉塵

スポンサーリンク

概要

著者

関連論文

スポンサーリンク