Jian-min Zhang, Qiu-zhi Shi. Determination of Stability Constants of Cadmium-Glycine Complexes by a Unified Treatment for Potentiometric and Polarographic Data[J]. Chinese Journal of Chemical Physics , 2006, 19(2): 164-168. doi: 10.1360/cjcp2006.19(2).164.5
Citation: Jian-min Zhang, Qiu-zhi Shi. Determination of Stability Constants of Cadmium-Glycine Complexes by a Unified Treatment for Potentiometric and Polarographic Data[J]. Chinese Journal of Chemical Physics , 2006, 19(2): 164-168. doi: 10.1360/cjcp2006.19(2).164.5

Determination of Stability Constants of Cadmium-Glycine Complexes by a Unified Treatment for Potentiometric and Polarographic Data

doi: 10.1360/cjcp2006.19(2).164.5
Funds:  the Scientific Research Foundation for the Returned Oversea Chinese Scholars,State Education Ministry.
  • The cadmium(Ⅱ)-glycine system was studied by the two experimental techniques, ion sensitive electrode (ISE) and differential pulse polarography (DPP), and the experimental data obtained were used by a unified mathematical treatment to calculate the complex stability constants. The combination of the two techniques is of many advantages as ISE can be performed at low [LT]:[MT] ratios and significantly higher [MT], whereas DPP could be used well at large [LT]:[MT] ratios and much smaller [MT]. This makes it possible to study a metal-ligand system in a relatively broader range of experimental conditions that, in turn, provides more information about the metakligand system of interest. Applying the unified mathematical treatment to the cadmium-glycine system, two new complexes MHL and ML2(OH) as well as three complexes ML, ML2 and ML3, reported in literatures, could be modeled and all their stability constants have been refined.
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Determination of Stability Constants of Cadmium-Glycine Complexes by a Unified Treatment for Potentiometric and Polarographic Data

doi: 10.1360/cjcp2006.19(2).164.5
Funds:  the Scientific Research Foundation for the Returned Oversea Chinese Scholars,State Education Ministry.

Abstract: The cadmium(Ⅱ)-glycine system was studied by the two experimental techniques, ion sensitive electrode (ISE) and differential pulse polarography (DPP), and the experimental data obtained were used by a unified mathematical treatment to calculate the complex stability constants. The combination of the two techniques is of many advantages as ISE can be performed at low [LT]:[MT] ratios and significantly higher [MT], whereas DPP could be used well at large [LT]:[MT] ratios and much smaller [MT]. This makes it possible to study a metal-ligand system in a relatively broader range of experimental conditions that, in turn, provides more information about the metakligand system of interest. Applying the unified mathematical treatment to the cadmium-glycine system, two new complexes MHL and ML2(OH) as well as three complexes ML, ML2 and ML3, reported in literatures, could be modeled and all their stability constants have been refined.

Jian-min Zhang, Qiu-zhi Shi. Determination of Stability Constants of Cadmium-Glycine Complexes by a Unified Treatment for Potentiometric and Polarographic Data[J]. Chinese Journal of Chemical Physics , 2006, 19(2): 164-168. doi: 10.1360/cjcp2006.19(2).164.5
Citation: Jian-min Zhang, Qiu-zhi Shi. Determination of Stability Constants of Cadmium-Glycine Complexes by a Unified Treatment for Potentiometric and Polarographic Data[J]. Chinese Journal of Chemical Physics , 2006, 19(2): 164-168. doi: 10.1360/cjcp2006.19(2).164.5

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