1996 Fiscal Year Final Research Report Summary
Development of Zinc Ion Sensor for Monitoring of Surface Coating Processes and its Use in Practical Electroplating Solutions
| Project/Area Number |
07555571
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 試験 |
|---|
| Research Field |
工業分析化学
|
|---|
| Research Institution | Kagoshima University |
|---|
Principal Investigator |
KAMATA Satsuo Kagoshima University, Faculty of Engineering, Professor, 工学部, 教授 (20041527)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
ASANO Yasukazu DKK Corporation, Special Laboratory, Vice-chief, 特別研究室, 次長
YOSHIDOME Toshifumi Kagoshima University, Faculty of Engineering, Assistant, 工学部, 助手 (60253910)
|
|---|
| Project Period (FY) |
1995 – 1996
|
| Keywords | Zinc ion sensor / Zinc bis [di (2-ethylhexyl) dithiophosphate] / Tetra-isobutyl thiuram disulfide / Membrane-coated-carbon rod ion-selective electrode / Surface plasmon resonance zinc-ion sensor / Electroplating bath |
|---|
| Research Abstract |
Two variations of potentiometric sensors for Zn (II) were developed for monitoring of zinc concentration in electroplating bath solutions. They are based on membrane-coated-carbon rod electrodes but differ in the nature of the sensing component of the membrane. One contains an ion exchange type, viz. Zinc Bis [di (2-ethylhexyl) dithiophosphate] (ZnDTP) while the other incorporates a neutral ionophore i.e. tetra-isobutyl thiuram disulfide (TiBTDS) as the sensing material. Both the sensors showed good response to the detection of aqueous zinc (II) over a wide range of concentration. The ZnDTP sensor provided a detection limit of 6*10^<-6> M with the working pH range of 4.0-7.0. The detection limit for the TiBTDS electrode was 5*10^<-7> M in the operational pH of 1.8-7.2. Potentiometric selectivity coefficient data obtained with the present electrodes proves that the ionophore based sensor possesses high selectivity for determination of zinc over most of the commonly encountered metals except Cu, Pb and Cd. The ion exchange type sensor, on the other hand, is characterized by having poor selectivity against other interferants. The rather unavoidable interference of Cu, Pb, and Cd on the Zn (II)-TiBTDS sensor is thought to arise because of the presence of soft sulfur donors in the ligand molecule. When the liquid membrane of the TiBTDS was incorporated in a surface plasmon resonance (SPR) Zn (II) sensor as the recognition element, a different selectivity pattern was obtained for the determination of zinc. This indicates that a reliable zinc sensor could be realized using TiBTDS.As a practical application of the Zn-TiBTDS, the change in zinc concentration in an electroplating solution was monitored for five hours. The observed concentration values agreed well with the values measured by AAS.
It can be concluded that TiBTDS forms a good sensing material for detection of zinc ions in aqueous media.
|
Research Products
(6 results)
