A direct spectrophotometric method for simultaneous determination of Co(II) and Ni(II), with diethanoldithiocarbamate (DEDC) as complexing agent, is proposed using the maximum absorption at 360 and 638 nm (Co(II)/DEDC) and 390 nm (Ni/DEDC). Adjusting the best metal/ligand ratio, supporting eletrolite, pH, and time of analysis, linear analytical curves from 1.0 10-6-4.0 10-4 for Co(II) in the pr...

A procedure for the efficient extraction and separation of rare earths and other valuable elements from used NdFeB permanent magnets is presented. In a first step, an iron free leachate is prepared from an used magnet using nitric acid. Cobalt is separated through a liquid–liquid extraction in aqueous nitrate media using as organic phase the ionic liquid trihexyl(tetradecyl)phosphonium nitrate ...

The properties of iridium oxide pH sensors produced by electrochemically induced deposition on gold electrodes were examined as a function of the composition of the deposition solution, as well as the electrochemical deposition protocol. The composition of the Ir IV deposition solutions, which included oxalate or ethylene diamine tetraacetic acid complexing agent or no complexing agent, had no ...

The distribution of Cd, Cu, Pb and Zn between a contaminated soil and the tree species Paulownia tomentosa was investigated in a pilot-scale assisted phytoremediation study. The influence of the addition of EDTA, tartrate and glutamate at 1, 5 and 10mM concentrations on metal accumulation by the plant and on metal mobilization in soil was evaluated. Root/shoot metal concentration ratios were in...

Natural fiber-made apparel dyed with natural dyes is drawing consumer attention because of the possible toxic and health hazards associated fabric synthetic dyes. However, many textile products available in market could pose a risk use heavy metals as dye-complexing agent. In this work, jute fabrics were multi-functionalized gallotannin (GT), using ferrous sulfate (FeSO4), calcium chloride (CaC...

Isosafrole serves as an excellent inducing agent in rabbits for Wq, the same isozyme as that which is induced by 3-methylcholanthrene and 5,6-benzoflavone. Since the isosafrole adduct formed with isozyme 4 is unstable, the uncomplexed cytochrome may be purified in very good yield (over 30%, based on total P-450) from liver microsomes of animals given this agent. Isosafrole forms adducts with bo...

In this study, a colorimetric discrimination of Pd2+ and Hg2+ ions in the solvent solid film states one silver nanoparticles (AgNPs) sensing system is presented. First, were prepared by reducing AgNO3 with sodium borohydride presence chitosan different organic acids, including acetic acid, propanedioic citric acid. The addition acids allowed for surface plasmon resonance (SPR) intensity size di...

cloud point extraction and spectrophotometric determination of trace quantities of cadmium in some vegetables have been developed. the research area for vegetables analysis was near to the zarin shahr where the soil received heavy metals from the esfahan steel company. cloud point extraction used dithizone as complexing agent and non ionic surfactant triton-x114 as micellar phase. several impor...