摘要
应用单扫描极谱法（LSV）及循环伏安法（CV），在pH9．8的氨性缓冲液中，对2，3-吲哚醌（ISA）的电化学行为进行了研究。在该缓冲液中ISA产生p1、p2两个还原峰，峰电位分别为-0．51V和-0．59V（vs．SCE）。其中p1峰峰电流i＂p，值与ISA的浓度在2×10^-6～2×10^-4mol·L^-1范围内呈线性关系（r=0．9995）。检出限为7×10^-7mol·L^-1，对浓度为4×10^-5mol·L^-1的ISA溶液进行11次平行测定，RSD为1．29％。所建立的方法已用于复方青黛片中ISA含量的测定。
In an ammoniacal buffer medium of pH 9. 8, the electro-chemical behavior of 2,3-isatin （ISA） was studied by linear sweeping voltammetry and cyclic voltammetry. Two reductive waves of ISA were observed with peak potentials, at -0. 51 V and -0. 59 V （vs. SCE）. Linear relationship between the values of 2nd derivative of peak current （i＂p） at Ep of -0. 51 V and of concentration of ISA was obtained in the range of 2 × 10^-6 -2 × 10^-4 mol · L^-1 （r= 0. 999 5）. The detection limit was found to be 7 × 10^-7 mol · L^-1 of ISA. Precision tested at the concentration level of 4×10^-5mol · L^-1 of ISA gave a value of RSD （n=11） of 1.29%. The proposed method has been used in the determination of ISA in natural Indigo compound tablets.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2006年第7期539-541,共3页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
基金
陕西省教育厅专项科研基金资助项目(03JK216)
关键词
单扫描极谱法
循环伏安法
2
3-吲哚醌
复方青黛片
Linear sweeping polarographic
Cyclic voltammetry
Isatin
Natural Indigo compound tablet
