| 概要 |
We investigated the possibility of using commercial detector tubes to perform simple environmental measurements. Hydrogen sulfide, hydrogen fluoride, ethylene oxide, isopropyl alcohol, xylene, toluene and formaldehyde detector tubes were used to measure two concentrations each of nitrous oxide (33% and 100%), sevoflurane (50 ppm and 5%), and isoflurane (50 ppm and 5%) inhalation anesthetics. The anesthetics were diluted with air in a fluorine-coated Tedlar bag until the target concentration was attained, and then measured using each detector tube with an electric pump. Sevoflurane and isoflurane at concentrations of 10, 20, 30 and 40 ppm were also subsequently prepared and measured.
The formaldehyde detector tube changed color with both low and high concentrations of sevoflurane and isoflurane. However, the entire tube changed color even with the low concentrations, making it impossible to confirm the concentration. Therefore, the formaldehyde detector tube was subsequently used to measure sevoflurane and isoflurane at concentrations of 10, 20, 30 and 40 ppm. Readings for anesthetic concentrations of approximately 1:100 were displayed; however, only approximate values could be obtained due to the indistinct border between the colored and non-colored sections. |
