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title page
Contents
(Abstract) 10
1. Introduction 12
A. Ion-selective electrode 12
1) Function of ion-selective electrode 12
2) Three basic types of selective electrode 13
3) Recent developments 15
4) Response mechanism 17
5) Selectivity 21
6) Slope of the linear part 24
7) Detection limit 24
8) Range of linear response 24
B. Schiff base 26
2. A lead(II)-selective PVC membrane based on a schiff base complex of N, N'-bis(salicylidene)-2, 6-pyridinediamine 29
A. Introduction 29
B. Experimental 31
1) Reagents 31
2) Preparation of polymeric ion-selective electrodes 34
3) Potentiometric measurements 36
C. Results and discussion 37
1) Potentiometric response 37
2) Selectivity 47
D. Conclusions 51
3. Lead(II)-selective polymeric electrode using a schiff base complex of N, N'-bis-thiophene-2-ylmethylene-ethane-1, 2-diamine as an Ion carrier 52
A. Introduction 52
B. Experimental 54
1) Reagents 54
2) Preparation of polymeric ion-selective electrodes 56
3) Potentiometric measurements 58
C. Results and discussion 60
1) Potentiometric response 60
2) Selectivity 68
D. Conclusions 71
4. Reference 72
(국문 초록) 75
감사의 글 77
Table 1. The compositions of membrane and their potentiometric characteristics of the lead-selective electrodes in pH 5.0 buffer solution 35
Table 2. Selectivity coefficients (-log K Pb2+, j)(이미지참조) for various different lead ion-selective electrodes 49
Table 3. Analytical data for prepared samples 50
Table 4. The compositions of membrane and their potentiometric characteristics of the lead-selective electrodes in pH 5.0 buffer solution 57
Figure 1. Scheme of anion-selective electrodes 16
Figure 2. Schematic diagram of a membrane electrode measuring circuit and cell assembly 18
Figure 3. Schematic view of the equilibrium between sample, ion-selective membrane, and internal filling solution for the special case of equal sample and internal electrolytes :... 19
Figure 4. a) Calibration curve for potentiometric measurement ; b) Determination of selectivity coefficients by the fixed interference method (FIM) ; c) Determination of selectivity coefficients by the matched potential method (MPM) 25
Figure 5. Mechanism for the reaction of schiff base fomation³ 27
Figure 6. Mechanism for the reaction of this study schiff base 28
Figure 7. N, N'-Bis(salicylidene)-2,6-pyridinediamine (BSPD) as lead ionophore used in this study 32
Figure 8. Structures of materials that composites of ion-selective electrodes. (a) Poly (vinyl chloride), (b) Tris(hydroxymethyl) aminomethane, (c) 2-Nitrophenyl octyl ehter, (d) Dioctyl phthalate,... 33
Figure 9. The pH dependence of the electrodes (m-1 and m-3) on the potentiometric response under the constant concentration (10-³ M) of lead ion: (a) m-1 and (b) m-3 39
Figure 10. Potentiometric responses of the Pb2+(이미지참조) ion-selective electrodes based on different mol% of additive: (a) no, (b) 20 mol%, (c) 50 mol% and (d)100 mol% 41
Figure 11. The lead-ion responses of the membranes prepared by different plasticizers with ionophore BSPD: (a) o-NPOE, (b) DOS, (c) DOP and (d) DOA 44
Figure 12. Response-time profile of the Pb2+(이미지참조) ion-selective electrodes based on ionophore BSPD 45
Figure 13. The titration curve for the response to 100 ml volume of 1.0×10-3 M lead concentration by the successive addition of 0.1M Na₂SO₄ solution 46
Figure 14. N, N'-Bis-thiophen-2-ylmethylene-ethane-1, 2-diamine as lead ionophore used in this study 55
Figure 15. Effect of pH of test solution on the potential response of the Pb2+(이미지참조) ISE (m-4) 62
Figure 16. Potentiometric responses of the Pb2+(이미지참조) ion-selective electrodes based on different mol% of additive: m-1; no, m-2; 20 mol%, m-3; 50 mol% and m-4; 100 mol% 65
Figure 17. The lead-ion responses of the membranes prepared by different plasticizers with ionophore BTYED: m-4; o-NPOE, m-5; DOP, m-6; DOA, m-7; DOS and m-8; o-NPOE (no ionophore) 66
Figure 18. Response-time profile of the Pb2+(이미지참조) ion-selective electrodes m-4 based on the ionophore BYETA 67
Figure 19. The selectivity coefficients (logKpot Pb2+,j)(이미지참조) towards lead ion obtained by SSM method with respect to the interfering ion (m-4) 70
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