湖北师范学院学报（自然科学版）
湖北師範學院學報（自然科學版）
호북사범학원학보（자연과학판）
JOURNAL OF HUBEI NORMAL UNIVERSITY(NATURAL SCIENCE)
2014年
3期
83-87
,共5页
夏新泉%陈灵%易林青
夏新泉%陳靈%易林青
하신천%진령%역림청
PVC-铋粉修饰碳糊电极%循环伏安法%铬黑T的pKa3
PVC-鉍粉脩飾碳糊電極%循環伏安法%鉻黑T的pKa3
PVC-필분수식탄호전겁%순배복안법%락흑T적pKa3
PVC-Bi-CPE%cyclic voltammetry%pKa3 BET
采用循环伏安法研究了该修饰电极在碱性B-R缓冲溶液中的电化学行为。研制了铋粉修饰PVC-碳糊电极，实验发现，在碱性条件下（ pH大于9时），其还原峰电流与溶液pH值呈良好的线性关系（ r＝0．9991）.采用循环伏安法，结合分光光度法测定了铬黑T三级离解常数pKa311．32，相对误差为2．0％.
採用循環伏安法研究瞭該脩飾電極在堿性B-R緩遲溶液中的電化學行為。研製瞭鉍粉脩飾PVC-碳糊電極，實驗髮現，在堿性條件下（ pH大于9時），其還原峰電流與溶液pH值呈良好的線性關繫（ r＝0．9991）.採用循環伏安法，結閤分光光度法測定瞭鉻黑T三級離解常數pKa311．32，相對誤差為2．0％.
채용순배복안법연구료해수식전겁재감성B-R완충용액중적전화학행위。연제료필분수식PVC-탄호전겁，실험발현，재감성조건하（ pH대우9시），기환원봉전류여용액pH치정량호적선성관계（ r＝0．9991）.채용순배복안법，결합분광광도법측정료락흑T삼급리해상수pKa311．32，상대오차위2．0％.
A novel PVC carbon paste electrode modified with bismuth powder ( PVC-Bi-CPE) was prepared in this paper . The electrochemical behave of the modified carbon paste electrode was investigated in basic B -R buffer solution by cyclic vol-tammetry.The results indicated that the reduction peak currents were in linear relationship with the pH (the linear correlation coefficient was 0.9991) in the condition of basic solution(pH>9).This novel modified electrode was applied to the determi-nation of 3-order dissociation constant ( pKa3 ) of BET Coupling with spectrophotometry in basic B -R buffer solution and the result showed that pKa3 BET=11.32 with a relative error of 2.0%.
