In this research, the selective flotation of galena and sphalerite minerals was evaluated from a pyrite-rich lead-zinc sample. An optimum mixture of selective collectors against pyrite and also organic/inorganic pyrite depressants was obtained in the flotation of galena and sphalerite by an experimental mixture design. The effect of different collectors and pH values were investigated in the ob...

Industrial areas are characterised by soil degradation processes that are related primarily to the deposition of heavy metals. Areas contaminated with metals are a serious source of risk due to secondary pollutant emissions and metal leaching and migration in the soil profile and into the groundwater. Consequently, the optimal solution for these areas is to apply methods of remediation that cre...

This study evaluated potential effects of organic trace mineral supplementation on reproductive measures in lactating dairy cows. Cows were blocked by breed and randomly assigned at dry-off to receive inorganic trace mineral supplementation (control; n = 32) or to have a portion of supplemental inorganic Zn, Cu, Mn, and Co replaced with an equivalent amount of the organic forms of these mineral...

Presented here is a heterometallic organic framework [Na(2)(H(2)O)(10)](n)[CuZn(4)(mu(3)-OH)(4)(btec)(2)](n).2nH(2)O (1, btec = 1,2,4,5-benzenetetracarboxylate) that incorporates mixed Cu(2+)-Zn(2+) oxide chains and accommodates Na(+) cations as extraframework guest species; such a building mode is comparable to that of aluminosilicate zeolites where the porous framework combines two kinds of s...

Background Dental caries in children is the most common disease worldwide. It remains the most prevalent chronic disease in young children in some developing countries. Objectives This study was carried out to evaluate the levels of calcium (Ca), inorganic phosphorus (P), zinc (Zn) and copper (Cu) in the saliva of pre-school children aged 4-5 years and to evaluate their plausible association wi...

In the title coordination polymer, [Zn(5)(μ(3)-OH)(2)(1,4-CDC)(4)](n) (1,4-CDCH(2) = 1,4-cyclo-hexa-nedicarboxylic acid) or [Zn(5)(C(8)H(10)O(4))(4)(OH)(2)](n), the asymmetric unit comprises one half of an octa-hedrally coordinated ZnO(6) complex unit (site symmetry ) and two five-coordinate ZnO(5) complex units, together with two μ(3)-bridging hydroxido ligands and four 1,4-CDC ligands (compri...

Chemical-mechanical separation of pig slurry into a solid fraction rich in dry matter, P, Cu and Zn and a liquid fraction rich in inorganic N but poor in dry matter may allow farmers to manage surplus slurry by exporting the solid fraction to regions with no nutrient surplus. Pig slurry can be applied to arable land only in certain periods during the year, so it is commonly stored prior to fiel...

Concentrations of particulate phytochelatin, a metal-binding peptide produced by eukaryotic phytoplankton, ranged from 2 to 50 pmol (g Chl a)-’ in samples collected from small harbors in southeastern New England. Although there was no obvious relationship between phytochelatin and total Cu concentrations, phytochelatin varied systematically with free Cu concentrations [Cu*+]. Transects in which...

Genotoxicity of Cu and Zn was assessed by use of the micronucleus (MN) test on Vicia faba roots. Plants were exposed to various leachates of raw and anaerobically digested pig slurry, with maximum total concentrations of 200microM Cu and 600microM Zn. The results indicated stabilisation of the organic matter during anaerobic digestion of the slurry and bioconversion of some phytotoxic organic c...