Determination of the stability constants of Pb–(DIPSO)x–(OH)y and Pb–(AMPSO)x–(OH)y systems

Eliat-Eliat, Maxime; Pinto, Isabel S.S.; Alves, Georgina M. S.; Olle, Victor; Soares, Helena

doi:10.1080/00958972.2013.842641

Cited by 2 publications

(2 citation statements)

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“…For bis-Tris, DIPSO and TEA, there are stability constants described in the literature for most of the metals included in environmental and biological studies. 8,[41][42][43][44][45] In the case of BES, the only evidence of complexation found in the literature corresponds to Cu and Co. 8,46 Bicine also complexes with most of the metals studied. 8,47 Based on their complexation properties, the use of buffers from this family is not advisable in environmental and biological studies containing metals, unless stability constants are taken into consideration (see below, Section 3.1.7.1.…”

Section: Bis(2-hydroxyethyl)amine Familymentioning

confidence: 99%

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(Un)suitability of the use of pH buffers in biological, biochemical and environmental studies and their interaction with metal ions – a review

et al. 2015

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The use of buffers to maintain the pH within a desired range is a very common practice in chemical, biochemical and biological studies.Among them, zwitterionic N-substituted aminosulfonic acids, usually known as Good'sbuffers, although widely used, can complex metals and interact with biological systems. The present work reviews, discusses and updates the metal complexation characteristics of thirty one commercially available buffers. In addition, their impact on biological systems is also presented. The influences of these buffers on the results obtained in biological, biochemical and environmental studies, with special focus on their interaction with metal ions, are highlighted and critically reviewed. Using chemical speciation simulations, based on the current knowledge of the metal-buffer stability constants, a proposal of the most adequate buffer to employ for a given metal ion is presented.

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Section: Bis(2-hydroxyethyl)amine Familymentioning

confidence: 99%

“…Studies about AMPSO complexation have shown that this buffer has the ability to bind with Ca, Co, Cu, Pb, Mg, Mn and Ni. 42,43,[62][63][64][65] …”

Section: Propanol Familymentioning

confidence: 99%

(Un)suitability of the use of pH buffers in biological, biochemical and environmental studies and their interaction with metal ions – a review

et al. 2015

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Aqueous complexation studies of lead(II) and cadmium(II) with 1,3-bis(tris(hydroxymethyl)methylamino)propane pH buffer

Ferreira

Pinto

Alves

et al. 2014

Journal of Coordination Chemistry

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Hydrogen buffers are important in biological studies, as a steady hydrogen concentration is of great importance in most scientific studies. One of these buffers is 1,3-bis(tris(hydroxymethyl)methylamino)propane (BTP), which, considering its structure, has complexing capabilities, as previously shown for other metals. In order to know the stability constants for Cd(II) or Pb(II) with BTP, glass electrode potentiometry and direct current polarography studies were carried out. Our results show that both metals form metal complexes, with Pb(II) forming stronger complexes with BTP as evidenced by its higher stability constants. In the Pb-BTP system, five species were described; PbHL, PbL, PbL 2 , PbL 2 (OH), and PbL 2 (OH) 2 , and their stability constants were determined to be 11.4 ± 0.3, 4.7 ± 0.3, 8.8 ± 0.2, 14.4 ± 0.3, and 18.4 ± 0.3, respectively. For the Cd-BTP system, four complexes were detected; CdHL, CdL, CdL(OH), and CdL(OH) 2 , and their stability constants were also determined as 10.9 ± 0.4, 4.10 ± 0.07, 8.2 ± 0.2, and 10.9 ± 0.2, respectively. These complexes decrease considerably the amount of free metal in solution within the buffering pH range. This fact should be considered when planning experiments were BTP and Pb(II) and/or Cd(II) ions are present.

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Determination of the stability constants of Pb–(DIPSO)_x–(OH)_y and Pb–(AMPSO)_x–(OH)_y systems

Cited by 2 publications

References 26 publications

(Un)suitability of the use of pH buffers in biological, biochemical and environmental studies and their interaction with metal ions – a review

(Un)suitability of the use of pH buffers in biological, biochemical and environmental studies and their interaction with metal ions – a review

Aqueous complexation studies of lead(II) and cadmium(II) with 1,3-bis(tris(hydroxymethyl)methylamino)propane pH buffer

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