The shift toward bioavailability-based standards for metals such as copper and zinc not only improves the ecological relevance of the standard but also introduces significant complexity into assessing compliance. This study examined differences in the copper and zinc complexation characteristics of effluents from a range of different sewage treatment works and in relation to so-called 'natural'...

Tightening quality standards for European waters has seen a move towards enhanced wastewater treatment technologies such as granulated organic carbon treatment and ozonation. Although these technologies are likely to be successful in degrading certain micro-organic contaminants, these may also destroy compounds which would otherwise complex and render metals significantly less toxic. This study...

The complexation equi li bria of zinc(lI ) wi th 2-hydroxy-IAnaphthoquinone. 5-hydroxyIA-naphthoquinone and 5.8-dihydroxyIA-naphthoquinone have been studied spectrophotometri call y as a function of pH in 50~ (1'/1') ethanol-water medium at 25°C and an ionic strength of 0.1 M NaCI04 . The spectral study of the complexati on reactions has been carried out in solutions contain ing equimolar conce...

This work aims at the development of a method electromagnetic activation salicylic acid molecules per se (SA) through ultrasonic (20 kHz) complexation with oxidized zinc-graphene structure. The result this implies synthesized nanopartiсles “ZnO – partially restored graphene oxide (rGO) SA” average size (5.53 ± 0.11) nm and hexagonal wurtzite zinc structure complexed SA molecules. Complexation r...

We show how zinc may easily be quantified in serum by first using an optimum concentration of guanidine hydrochloride to cause release of zinc from proteins, followed by complexation of released metals with cyanide. The cyanide complex of zinc is preferentially demasked with chloral hydrate, followed by a colorimetric reaction between zinc and 4-(2-pyridylazo)resorcinol. This is a sensitive wat...

The complexation of zinc by natural organic ligands in the upper 600 m of the central North Pacific was determined with differential pulse anodic stripping voltammetry at a thin mercury film, rotating glassy-carbon disk electrode. Of the dissolved zinc in surface waters >98% was bound in strong complexes (log Klcond, =“z+ = 11 .O) by relatively zinc-specific organic ligands existing at low conc...

Cyclic voltammetry was used to determine the stability constants for the complexation of cadmium and zinc ions with hydroxyl-terminated polyamidoamine generation 2 dendrimers with an ethylenediamine core (PAMAM G2-OH) at a mercury ultramicroelectrode. Cadmium and zinc ions were found to form poly-metal complexes through the interactions with interior amino groups rather than hydroxyl groups and...

A series of cyanobipyridine-derived zinc(II) bis(thiolate) complexes are prepared rapidly and efficiently by a microwave-assisted cross-coupling/complexation sequence and display luminescence that can be modulated using intrinsic functionality and ancillary ligands.

Zinc finger proteins acquire DNA-binding ability by Zn (II) complexation. In the zinc finger domain of the Cys2His2 type, each finger is approximately 30 amino acid residues long and consists of a simple ββα–fold stabilized by chelation of a zinc ion with the conserved Cys2His2 residues. A zinc finger motif of Cys2His2 offers an attractive framework for the design of a novel DNA-binding protein...