| Project/Area Number |
08455330
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Material processing/treatments
|
|---|
| Research Institution | The University of Tokyo |
|---|
Principal Investigator |
TSUJIKAWA Shigeo The University of Tokyo, School of Engineering, Professor, 工学系研究科, 教授 (20011166)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
SHINOHARA Tadashi The University of Tokyo, School of Engineering, Assosiate Professor, 工学系研究科, 助教授 (70187376)
|
|---|
| Project Period (FY) |
1996 – 1997
|
| Project Status |
Completed (Fiscal Year 1997)
|
| Budget Amount *help |
¥8,400,000 (Direct Cost: ¥8,400,000)
Fiscal Year 1997: ¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 1996: ¥5,300,000 (Direct Cost: ¥5,300,000)
|
|---|
| Keywords | acid rain / rain / pH / ACM Type corrosion sensor / monitoring / ACMセンサ / 酸化物半導体 / TiO_2 / NOx |
|---|
| Research Abstract |
The possibility of ACM sensor, which is composed of plantinum coupled with zinc, used on the pH measurement of acid rain was investigated. Artificial acid rain without sea salt were prepared with H2SO4/HNO3 solution with [SO_4^<2->] : [NO_3^-] ratio of 2 : 1. The pH range from 3 to 5.5 was obtained by diluting the H_2SO_4-HNO_3 solution with deionized water. The polarization curves of platinum and zinc in flowing articial acid rain were detected. The influences of sensor's configuration and flowing rate of artificial acid rain on the couple current of the sensor were also systematically studied. The sensor output, Ig, depends on cathode area rather than anode area, and increases with decreasing the distance between anode and cathode. The configuration of the sensor was determined based on the above results. It can be seen that Ig mainly depends on pH and conductivity of the artificial acid rain solution, and does not depend on flowing rate when it is larger than 10mm/s. Thus pH and conductivity of the actual rain can be monitored in-situ by measuring and analyzing the outputs of several sensors with different configurations. The calibration equation was established based on above results, and pH of actual rain was monitored.
|
