@article{oai:u-ryukyu.repo.nii.ac.jp:02007521,
 author = {上原, 方成 and 周藤, 宜二 and Uehara, Hosei and Sudo, Yoshiji},
 issue = {15},
 journal = {琉球大学理工学部紀要. 工学篇, Bulletin of Science & Engineering Division, University of the Ryukyus. Engineering},
 month = {Mar},
 note = {In the case of grain-size analysis test of soils smaller than 2,000 microns-particle size, a sedimentation process using a hydrometer is used. In this procedure, the dispersing agent is used for securing the necessary and accurate data of grain sizes. In JIS procedure-A 1204-1969, usually, sodium silicate (Na₂Si0₃9H₂0) or sodium hydroxide (NaOH) is used as the agent. However, in Okinawa it is thought that, sodium triphosphate (Na₅P₃0₁₀) is more effective for the certain soils to disperse. This paper clescribes a test results of grain-size analysis using some other dispersing agents for Shimajiri Formation soils to get a suitable agent and its procedure. It is shown that sodium hexametaphosphate (NaP0₃)₆ is more effective than others used before for Shimajiri Formation soils., 紀要論文},
 pages = {71--74},
 title = {土の粒度試験について－沖縄の土における分散剤の効果、その1－},
 year = {1978}
}