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deTeRM INATION OF THe STABILITY CONSTANTS OF COMPLeXeS OF HISTIdINe,SOMe dIPePTIdeS ANd TRIGLYCINe WITH Zn(Ⅱ)ANd Cd(Ⅱ)uSING SMALL-SCALe PH-MeTRIC TITRATIONS

引用

Chinese Chemical Letters 1991年第9期2卷 723-724页

作者： ai ru lu department of chemistry,northwest normal university,lanzhou,730070 leslie d.pettit jan e.gregor school of chemistry,the university,leeds ls2 9jt,u.k

A potentiometric study on the complexes of His,Gly-His,ALa-His,Gly-Gly and Gly—Gly—Gly with Zn(Ⅱ)and Cd(Ⅱ)has been ***-scale potentiometric titrations were car- ried out to determine stabil ity constants of complexes at 25℃ with I=0.10 mol dm^(-3)(kNO_3).The com- puter programs SuPeRQuAd were applied for data treatment with satisfactory results.

关键词： Gly deTeRM INATION OF THe STABILITY CONSTANTS OF COMPLeXeS OF HISTIdINe,SOMe dIPePTIdeS ANd TRIGLYCINe WITH Zn ANd Cd uSING SMALL-SCALe PH-MeTRIC TITRATIONS

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A COMPARISON OF THe deTeRMINATION OF STABILITY CONSTANTS OF COMPLeXeS OF Cd(Ⅱ)WITH AMINO ACIdS ANd SIMPLe PePTIdeS uSING MICRO—pH—MeTRIC TITRATIONS ANd CYCLIC VOLTAMMeTRY

引用

Chinese Chemical Letters 1993年第10期4卷 933-934页

作者： ai ru lu department of chemistry,northwest university,lanzhou,730070leslie d.pettit Gareth BeRNARd jan e.gregor school of chemistry,the university of leeds,leeds,ls2,9jt,u.k.

This paper reports the determination of stability constants for complexes of Cd(Ⅱ)with Gly, Ala,Val,Asp,Gly—Asp,Asp Gly,Gly—Gly and Gly—Gly—Gly using both micro—pH—metric titra- tions and the application of convolution—deconvolution cyclic voltammetry at 25℃ and I=0.10 mol· dm^(-3)(kNO_3).Stability constants were calculated from pH—metric data using the SuPeRQuAd com- puter program and cyclic voltammograms were collected,stored and manipulated using the eG and G CONdeCON 300 software.A considerably larger ligand:metal ratio(e,g.50:1)was possible using *** of results from the two techniques suggests that stability constants for the species[CdL_2]and[CdL_3]are reliable when calculated fromvoltammetry while those for[CdL]are more reliable when determined by pH-metric titration.

关键词： A COMPARISON OF THe deTeRMINATION OF STABILITY CONSTANTS OF COMPLeXeS OF Cd MeTRIC TITRATIONS ANd CYCLIC VOLTAMMeTRY WITH AMINO ACIdS ANd SIMPLe PePTIdeS uSING MICRO pH

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A comparison of the determination of stability constants of complexes of Pb(II) with amino acids using micro-pH-metric titrations and cyclic voltammetry

引用

Chinese Journal of chemistry 1991年第6期9卷 493-498页

作者： lu ai-ru pettit leslie d.BeRNARd Gareth gregor jan e. department of chemistry Northwest Normal UniversityLanzhou 730070 school of chemistry The University of LeedsLeedsLS29JTUK

This paper reports the determination of stability constants for complexes of Pb(Ⅱ) with Gly, Ala, Asp and Gly-Gly using both micro-pH-metric titrations and the application of convolution-de- convolution cyclic voltammetry at 25℃ and I = 0.10 ***^(-3)(kNO_3). Stability constants were calculated from pH-metric data using the SuPeRQuAd computer program and cyclic voltammograms were collected, stored and manipulated using the e G and G CONdeCON 300 software. A consider- ably larger ligand: metal ratio (e.g. 50:1) was possible using voltammetry. under these conditions, hydroxy complex formation was minimised and the formation of bis-complexes optimised. Computer based calculations were carried out on PC-compatible microcomputers fitted with mathematics co- processors. evaluation of results from the two techniques suggests that stability constants for the species [PbL_2] are reliable when calculated from voltammetry while those for [PbL] are mote reliable when determined by pH-metric titration.

关键词： A comparison of the determination of stability constants of complexes of Pb with amino acids using micro-pH-metric titrations and cyclic voltammetry pH II

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