Lanthanide tetrad effects : Extension of Jorgensen's theory and its new developments
| Project/Area Number |
21654081
|
|---|
| Research Category |
Grant-in-Aid for Challenging Exploratory Research
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
Geochemistry/Astrochemistry
|
|---|
| Research Institution | Nagoya University |
|---|
Principal Investigator |
KAWABE Iwao 名古屋大学, 環境学研究科, 教授 (40127890)
|
|---|
| Project Period (FY) |
2009 – 2011
|
| Project Status |
Completed (Fiscal Year 2011)
|
| Budget Amount *help |
¥3,310,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥210,000)
Fiscal Year 2011: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2010: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2009: ¥1,900,000 (Direct Cost: ¥1,900,000)
|
|---|
| Keywords | 地殻・マントル物質 / 地球化学 / 希土類元素化学 / ランタニド化学 / 四組効果 / 希土類元素 / ヨルゲンセン-川邊式 / REE分配係数 / 希土類元素鉱物 / ランタニド / ランタニド四組効果 / ヨルゲンセン理論 / 電子雲拡大効果 / ランタニド・キレート錯体 / ヨルゲンセン・川邊の式 / ランタニドの熱力学 / 熱力学量 |
|---|
| Research Abstract |
As a case study of thermodynamic data for aqueous Ln(III)-chelate complex formations, those data for Ln(III)-DTPA and Ln-EDTA complex formations have been examined in view of the Jorgensen-Kawabe(JK) equation for the lanthanide tetrad effect. Ln-chelate formations represent such reactions that ligands of H-2O of aqua Ln(III) ions are replaced by(DTPA+H-2O) or(EDTA+H-2O), where. H and. S show similar tetrad effects, but the tetrad effects are cancelled almost totally in. G through. G=. H-T. S. Previous studies overlooked this mechanism, and led to misunderstanding.
As an experimental study, REE(Ln+Y) partition coefficients for the pair of BaSO4/aqueous solution have been determined in the temperature range of 10~ 200. C. The tetrad effects of△H and△S for REE partitioning reaction have been shown. Using the Gibbs-Helmholtz equation and JK equation, the tetrad effects have been analyzed.
REE abundance patterns of rare-earth minerals(kimuraite and lanthanite) normalized by chondrite, indicate the tetrad effects. We confirmed that the tetrad effects can be well reproduced by JK equation. This is the first demonstration in REE geochemistry that REE compositions of REE minerals can be fitted to the simple theoretical equation.
In order help graduate students and young researchers understand the theoretical base of Jorgensen-Kawabe equation, the three textbooks on Statistical Mechanics, Physics on Electricity and Magnetism, Quantum Mechanics have been prepared and registered them in Repository of NU Library for their open uses. Jorgensen-Kawabe equation itself and the results of the present study are discussed and cited in another textbook"REE Chemistry and Geochemistry", which is now in preparation.
|
Report
(4 results)
Research Products
(11 results)
