粉じん線中の遊離珪酸含有率の決定
吸着式じん埃計に関する研究 (第3報)
1958 年 74 巻 846 号 p. 1001-1005
詳細
1958 年 74 巻 846 号 p. 1001-1005
Sinplified method for determination of free silica in airborn dust in mine atmosphere is suggested in this report. This is to say, the fundamental study on the microscopic method for determination of free silica content in samples on the deck glass collected by the Jet Dust Counter applying the phosphoric acid method is reported in this paper.
This method has following merits:-
1) This method is simple and practical.
2) Less time and labours will be necessary for sampling.
3) Contents of free silica in very fine and injurious dust can be determined.
4) Direct relations between several mine works and free silica content in mine dust can be quested.
5) Free silica content can be shown by the percentage of number of particles, so from point of prevention for Silicosis, this is a very significant method.
