The aim of research is to study the effects of hot-spring quality and environment parameters such as conductivity, TDS, ORP, pH, irradiation and mineral addition on the air negative-ions production, in order to find the appropriate hot-spring and method that can produce the highest negative-ions.
The results showed that irradiation, agitation and mineral addition can enhance higher air negative-ions. When UV irradiation was used at Di-Re-Gu-Leu-Hwang-Quan Hot-spring, it can produce 2,000 ions/cm3. When agitation was applied, it can produce 4,430 ions/cm3. For Rui-Sui Rui-Chong iron hot-spring, 4,430 ions/cm3 was produced when agitate, however, the ions production would be to 5,400 ions/cm3 when mineral added in the reactor. In addition, the hot-spring found to produce more air negative-ions than in the water. This study also showed that tourmaline can produce air negative-ions because of its magnetic field.
The other 15 minerals were also used to find which one has the same effect as tourmaline. Among these 15 minerals, glaucophane-schist and chalk could show the same effect as tourmaline. This might because these 2 minerals also have magnetic field effect and can electrolyze water to produce ions as same as tourmaline.
It also showed that hot-spring can produce high amounts of ions. If ions and hot-spring are combined, then it will effectively increase the hot-spring usage, human health care and environment cleanness.