?20? ??? (Voltammetry) - PowerPoint PPT Presentation

1 / 47
About This Presentation
Title:

?20? ??? (Voltammetry)

Description:

Voltammetry) ... voltammetry Square wave ... – PowerPoint PPT presentation

Number of Views:173
Avg rating:3.0/5.0
Slides: 48
Provided by: 6649303
Category:

less

Transcript and Presenter's Notes

Title: ?20? ??? (Voltammetry)


1
?20? ???(Voltammetry)
2
  • ??
  • 1922 Heyrovsky??,1959??Nobel?
  • 1934 ????(Ilkovic) ??????,??
  • 50?????,????????
  • 80?????,????,????
  • ?? ????????????

3
  • ??????? ??????????-????????????
  • ???(polarography) ???????????????????????????
  • ??? ??????????????????????
  • ????(????) ????,?????????,????????,???????????????
    ??
  • ?????(????) ????,?????????,????????,???????????

4
???
?????????????
idil-ir
??????
????
???? (A dropping mercury electrode)
????
5
?????
6
????
7
  • ??????
  • ????? ???????????,?????????,??????,???????????0.3
    V?
  • ??????
  • ????,???????
  • ?????,?????????

8
????
  • ??????
  • ????
  • ????

???????
(?????????????,??????????)
9
Fick????
????
x0
x xdx
Fick????
????
????
????t 0, x 0 CO C, CR 0 ????t
?0, x 0 CO C , CR C- C
t ?0, x ? CO C , CR 0
????
10
??????????
??????
??
?????
11
???????????Cottrell??
???????????3?????????,????,????
??????,?????????
??????,??????????????????????????????
,???????????????????????? ?
12
???????????
?????
????(mg/s)
???????(mmol/L)
?A
?????????????(cm2/s)
????(s)
????????
????(Ilkovic)???
13
?????????
????????????
  • (1)?????m2/3t1/6
  • (2)?? ???n?????
  • (3)????? ??????
  • ????????????

????
Ilkovic??
?????????
14
  • ??????????
  • ????
  • ???? ???????
  • ????(????) ????????????????????? (10-5 mol/L)
  • ?????????????????????
  • ???? ???????????
  • ????????????
  • ??????????
  • ????????????,????????????
  • ??????????,??????????????,???????????

15
  • ????
  • ???????(??????)
  • ?? ??????
  • ????????(N2,Ar?)
  • ????
  • ?? ???H??? ????????pH??
  • ?? ????????????????
  • ???????
  • ?? ??????????????0.2 V
  • ???????????,????????
  • ?????

16
  • ???????

???????
??????CO C, CR 0 ????????
k, k????D1/2, D? 1/2???
?
?
???? ?????????
17
??????CR C, CO 0
?????? CO C O, CR C R
(id)c
(id)a
18
  • ???????????

??????,? ????????n??1/2 25ºC?,
????????(?????)n/0.059 ?????????????
id
19
?????????????
Mn ne- Hg M(Hg) , Eo
(1)
Mn pL MLPn K
(2)
MLpn ne- Hg M(Hg) pL,
Eco (3)
??(1) ?????? (2) ???????,L0 L

20
??????
????
???
?????,????????????,? i nFAkc ( MLpn -
MLpn 0 )
????
????
?????,?????????,? i nFAkcM(Hg) 0
21
???????
????????
???????????,???????????,??????????
22
??????
?????????????????????
???
????
????? ?????????? ????
???
???
????
???
23
??????
1. ??????? ???
??????
????(????)
????
????
????
??(??????????)
24
  • 2. ?????????????

????? ??????????????,IR?????,??????,??????????????
??,???????????????,???????????
????? ?????????? ???????????????????? ???????????
??????
25
3. ????? ????? ????
????????
(1) ????????10-5 M
?????
(2) ??????????
??
??-???????
26
i
t
Faraday???????
27
????????????
  • ?????? ????

(1) ???10-6 M (2) ???????
28
  • ??????(?????) ?????????????
  • ?????????????????????????????????,??????

?????????????
???? ?????
?? ??,0.2 V/min ??,0.25 V/s
???? ??? ???
????? S? ??
???????? ??? 1?
29
?????
E
(1) ???
E?
a.
Randles-Sevcik equation
ip (2.69?105) n3/2 A C D1/2 v1/2
(25ºC)
b.
c.
iPc/iPa 1
30
(2) ????
(3) ????
?????
Ep?v??
(1) ???10-6 M (2) ???????
31
  • ?????????????????,???????????????,????????,???????
    ?
  • ????????????????,A?????,???????,????????,????????
    ???? ????

32
?????
  • ??????
  • ?????????
  • ????????

???
E
ic
????
i
???????
if
???10-7 M
??????????????????????
????
33
??(??)???
??
??
34
  • ???10-8 M
  • (2)????????

35
  • Faraday?? if ? t-1/2
  • ???? ic ? e-t
  • ??????? i ? t-n (ngt1/2)

36
???????
Square wave
voltammetry
37
??(??)???
??????????????
38
?????

i
C
39
?????
????
40
?????
  • ?????(??)????,???,???????103?
  1. ????
  2. ??
  3. ??

???? ??????,???10-12 M, ??????????????
41
Multi-element Analysis
Cd2
Cu2
Cr3
Pb2
42
????????????
43
?????
  • ???? ?????????????
  • ??,???40??????
  • ???
  • ??????????n,D,C,E0,ks
  • ??????
  • ???????????
  • ????
  • ?????

44
? ? ? ? ?
45
?????
46
  • ??
  • P569-570 9. 10. 11. 12. 13. 14

47
  • ????
  • ???????5,7?????
  • ????SCI???????,???????????????????????????
  • ???????8,9?????
  • ????SCI???????,??????DNA????????????
  • ???????1000?
  • ????4?22?
  • ?????????(?????????????,????????),?????
Write a Comment
User Comments (0)
About PowerShow.com