Modelling and Optimization of Stability Constants of Cadmium or Zinc with Biological Buffers (DIPSO or TAPS) in Aqueous Solutions by Electrochemical Techniques

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

“…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.…”

“…For TAPSO and TAPS, there is evidence of complexation with Cd, Co, Cu, Pb, Ni and Zn. 41,43,[49][50][51]55,56 Muzikar et al 57 warned against the use of TAPS in buffering electrolytes and presented stability constants with Ca, Mg, Sr and Ba, but the values are extremely low. In the case of TABS, only values for Fe and Cr were found in the literature, 25,26 but due to its structure (Table 1), it probably complexes with other metals.…”

Viewpoint: Challenges in Colloidal Photocatalysis and Some Strategies for Addressing Them

“…154−156 These functional groups, however, sequester metal ions such as the ones typically used in QDs: Cd 2+ , Pb 2+ , and Zn 2+ . 157,158 Consequently, these buffers can lead to QD degradation by dissolution. 159 When choosing a buffer for reactions catalyzed by QDs, we are limited to those that do not complex with the surface of the QDs.…”

“…Many commonly employed buffers can lead to degradation of QDs through stripping of surface atoms. Good’s buffers comprise more than 20 commonly used buffers, often zwitterions with multiple charged or polar functional groups that were originally designed to be used in biological systems with large effective buffering ranges. − These functional groups, however, sequester metal ions such as the ones typically used in QDs: Cd 2+ , Pb 2+ , and Zn 2+ . , Consequently, these buffers can lead to QD degradation by dissolution . When choosing a buffer for reactions catalyzed by QDs, we are limited to those that do not complex with the surface of the QDs .…”