principle and process polarography

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???????????
??????????? principle and process
polarography ???????? theory of diffusion
current ????????? interference current and
elimination
polarography and Voltammetry

• ???
• ?????????

principle and process polarography
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????????????principle and process polarography
????????????????i-??E?????????????
?????(polarography)???????????? 1.??????
?????????????????? ?????????????????????????
?? ?????????????????????
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??????????
??????????????,?????????????,????????????,????
?,?????????????????????????,????????????
?????
????
??????????????????????????
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??????????
E?fa-fciR i??, fa?? E?-fc(SCE) fc
-E?(vs.SCE)
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??????
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(No Transcript)
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??????????-Cd2(10-4mol/L)
???-0.2 V?????-0.7 V??,????-?????
?????,?????????,????????????????????????Cd2???
???,Cd2?????????????
??????,?????????????????,??,??????
(???0.05mm????),???????????????,???????
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2. ??????id
???,????????????,????????id(?????????) ?
????????????????,?????????????E1/2 (
E1/2???????)
id
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id
if
ir
E1/2
if????limiting current id??????limiting
diffusion current ir????residual current E1/2
????half-wave potential
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3. ????????
(1) ?????????,????????? (2)
??????,????????,????????????????
(3) ???????????????(?????-supporting
electrolyte),?????????????????????? (4)
????????????????????????????,??????????????
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4. ???????
a. ????????????,??????? b. ??????,?????????,???
??(???????????,??????????????????) c.
?????????? d. ????????,???????,??????????????
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e. ????? ?????????,??????,????????,???????????
,??????????????????????????????? Hg??????????????
??????(????)?
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????????????
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???????? p149-150
1.??????
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???????? p149-150
c0
1.?? ?? ??
ce
????????
????????
??id????????????,?????????????
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p150
????(Ilkovic)??-??????? ???????
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???????????? ????????t1/6??,?????????????????
?????????????????????,????,?????????,?????????????
???????,????????
0.5MCd2, 1MHCl
1MHCl
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3. ?????? p152-154
?????? ???????????????? ?????????????
(???????????) Mn ne
Hg M(Hg)(??)
c?a ?????????????? c?M????????????????a,
?M????
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????????,aHg???
??????? id KM cM
(3) ???????????,
c?M?????
(4)-(3) ?
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????????????????(??)????????????,????????
???????,?
?(6)?(5)??(2)
?
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???????,? i id / 2 ?,????,?
? ? ? ? ? ?
??????????????????????? i id /2 ?, EE 1/2
???????,????????
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???????????? p156 interference current and
elimination
1.???? (a)????????????? ??????????????????????
??????????????????? (b)????(??????)
??????????????? ??????????????????,??????????,
??????????,????? ??????10-7 A????,???10-510-6m
ol/L?????????????
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2.????
????? ?????????? (???????)?? ???????????
?????????? ????????????????,??????????????
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3.????
?????????????????,?????????,?????????????????
????????,??????????????????????????????????
????????? ???????
4.???????? ??????????????
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• ??? ?????????
• principle and process of polarography
• ??? ???????????
• qualitative quantitative methods and
  applications of polarography
• ??? ????????
• modified polarographic technology
• ??? ???????????
• principle and technology of stripping
  voltammetry

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