1998 Fiscal Year Final Research Report Summary
Development of multi-tracer method using short-lived radionuclides on study of organic matter in natural water
| Project/Area Number |
09480116
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Environmental dynamic analysis
|
|---|
| Research Institution | Shizuoka University |
|---|
Principal Investigator |
SUZUKI Yoshimi Shizuoka Univ.Science Professor, 理学部, 教授 (30252159)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
CASARETO Beatriz Lab.Aquatic Science, Biology Chief Scientist, 主任研究員
MATSUMURA Toru Res.Environment, Ocean Chief Scientist, 研究職
YOKOTA Kiichiro Biwako Res.Ecology Scientist, 研究員
YAMAMOTO Masayoshi Kanazawa Univ.Science Associate Professor, 理学部, 助教授 (10121295)
|
|---|
| Project Period (FY) |
1997 – 1998
|
| Keywords | organic matter / radionuclides / natural water / decomposition rate |
|---|
| Research Abstract |
To know the fate of organic matter In natural water involved to the biological processes Is Important in the carbon cycle. Especially, to determine decomposition rate of dissolved and particulate organic matters is more important. However, it Is difficult to determine from only changing of organic matter concentrations at the field. The short-lived radionuclides are very useful tool for determination of time constant of organic matters. P-32, Pb-210, Po-210 and U- 238 were used. Question is that since the concentartion of these radionuclides In natural water are very few, a large volume of natural water is required for collection of these elements.
Ultralfiltration system and large volume filtartion system are employed for separation of these elements from natural water. It was confirmed that these radionuclides In organic fraction were yield quqntitatively and were measured using beta and gamma counting with lobackground (ex. 0.03cpm for P-32). It was found that P-32 is useful tool for determination of age of organic matters in natural water.
|
