- 作者: 高振豐; 郭欽盛; 賴再德
- 作者服務機構: Department of Chemical Engineering, National Cheng Kung University, Tainan, Taiwan 700
- 中文摘要: The polarography of lead ion in dimethyl sulfoxide (DMSO) was investigated in the DMSO concentration range 0-80 vol.%. The complex species identified were Pb2(DMSO)…, Pb(DMSO)…, and Pb(DMSO)…, in [DMSO]<10 vol.%, 10<[DMSO<43 vol.% and [DMSO]>43 vol.%, respectively. In the presence of pamoic acid, the reduction of lead ion in DMSO was two-election reversible diffusion–controlled at pH…6.0, but it became irreversible at pH>6.0.The complex species identified was Pb(Dm)2(Pm)3(OH)5- at pH>6.0. The rate constants of electro-reduction and electro-oxidation, activation energies were determined. The hydrolysis constants of lead ion in dimethyl sulfoxide concentration 40-70 vol. % at pH 4.5-6.0 were found to be of the order of 10-6. The stability constants of the Pb(DMSO)… and Pb(DMSO)… were also determined to be of the orders of 10… and 10…, respectively.
- 英文摘要: --
- 中文關鍵字: lead; DMSO; pamoic acid; polarography; kinetic parameters.
- 英文關鍵字: lead; DMSO; pamoic acid; polarography; kinetic parameters.