single sweep polarography

1
???????????
??????? single sweep polarography ??????
alternating-current polarography ?????? square-wav
e polarography ?????? pulse polarography
???????? alternating-current oscillopolargraph
polarography and voltammetry

• ???
• ????????

modified polarographic technology
2
??????????single sweep polarography
1. ????? ??????(??????????)
??????????????????????????????????????????????????
???????????????????????(????)
??? X????????? Y???????(R??,??????????)
3
2. ??????????
?????,????????????,????????????? ip ???
Ep ????? ip ? c ????
(1) ?????,??????????????,???????,??bc? (2)
?????????,????,?? c d? (3) ??????, ????,????,
?? d e? ???????iE??, ??????????
4
3. ??iE?????
(1) ???????? At8.49?10-3m2/3t2/3
dA/dt5.7?10-3m2/3t - 1/3 t ??,??????????,??????
?,??????????
5
(2) ????????????????
?????????????????????? (3) ???????
???????????,????????( 10-7
A,???10-5mol????????)?
6
4. ???????
?????????,???????????????????
?tp??????
Ip2.69?105n 3/2 D 1/2 V 1/2 m 2/3 tp 2/3 c K
c ???
25?C
??????????????????
7
5. ?????????
????????? (1)??? ????????????,?????4080??
(2)?????? ???????????? n1 ?, ?2?
n2?,?5?? (3)???? ??????40 mV???
???????E1/2gt200 mV?????
8
???????? AD polarography
1.???? ????(????????)?????????(5-50
Hz)???????????,?????????????????? ????
???????? (1) ???? (2) ???? (3) ????
???????????,????????????????
9
????????????
(1) ??? A ?,????????????????????????????????? (2)
?????????????????,??????????????? (3)???? B
?(????)????????? (4)??? C ?,?????????????????.
??????????
10
2.??????????????
????? Ox ne ? Red
? ???????? ?V0 ???????
?? (1) ?????????? (2) ?????????,????40
mV???? (3) ??????
11
???????? square-wave polarography 1. ??
???????????????????????????????,?????????,?????
???????????,????????,??????????????
2. ?? (1) ????10-7 - 10-8 mol/L??????2????? (2)
??????
12
???????? pulse polarography ??
?????????????,??????????????????? ??????
????????????,??2-100mV?????,????4-80
ms,?????????????i ???????,???????? 10-8 10-9
mol/L
13
?? ????????alternating-current oscillopolargraph
1.????
????-1??????????1??????? ????????0-2 ??
14
??M,N ???????????????,????c???r,??????E
- t ??? ??M,N ???????????????,??????dE
/dt - t ??? ?????,?????????,?????? dE
/dt -E ???
15
2. dE /dt -E ???????????
?????????,?2mm????????? ??????????,?0.4
mm???????????1.5mm???,?????,????????.
??????????,???? dE /dt -E ?????????
????????????,???? dE /dt -E ???????????
16
??????????? Zn2
???,???Zn2??????, dE /dt -E ?????????,
??EDTA????,??Zn-EDYA???,????,????,?????,???????
????????????????Zn2?????????????Ca2?
17
????

• ??? ?????????
• principle and process of polarography
• ??? ???????????
• qualitative quantitative methods and
  applications of polarography
• ??? ????????
• modified polarographic technology
• ??? ???????????
• principle and technology of stripping voltammetry

??