a new sorbent composed of 3-aminopropyltriethoxy-silane-coated magnetic nanoparticles, functionalized with rhodium(iii) porphyrin complex was synthesized and characterized by elemental analysis, x-ray diffraction (xrd), transmission electron microscopy (tem), fourier transform infrared spectroscopy (ft-ir) and thermogravimetric analysis (tga). the effect of some co-existing anions present in aq...

fe2+ ion-selective membrane sensor has been fabricated from polyvinyl chloride (pvc) matrixmembrane containing neutral carrier tetra phenyl porphyrin (tpp) ionophore. the addition ofsodium tetraphenylborate (natpb) and the plasticizer dbp has been found to substantiallyimprove the performance of the sensor. the best performance was obtained with the sensor havinga membrane of composition of tpp...

a simple extractive spectrophotometric method has been developed for the estimation of miconazole nitratein both pure and pharmaceutical preparation. the method is based on the formation of ion-pair complex of thedrug with acidic dye bromothymol blue (btb) in acidic condition, followed by its extraction in organic solvent(chloroform). the absorbance was measured against the corresponding blank....

polypyrrole (ppy/cl) and polyaniline (pani/cl) synthesized chemically onto sawdust (sd)was used for removal of thiocyanate (scn-) ions from aqueous solutions. the effect of someimportant parameters such as ph, initial concentration, sorbent dosage, and contact time onuptake of scn- was investigated. ppy/sd was found to be much more effective sorbent thanpani/sd for uptake scn- from aqueous solu...

using uv-vis spectrophotometric method, the formation constant for interaction of fe2+(aq) ion with l-alaninewas experimentally studied at ph = 4.1 ± 0.01 (50mm of potassium hydrogen phthalate buffer), ionic strengthof 0.1m potassium nitrate and at 5 different temperatures 15,20, 25,30 and 35 t. the optical absorption spectraof mixtures containing considered cation and l-alanine were analyzed b...

background: acute methanol poisoning is one of the most important chemical poisoning due to drinking of illegal and handmade alcoholic beverages in iran. the aim of this study was to evaluate clinical and biochemical parameters as prognostic factor in acute methanol poisoning. methods: a retrospective study was performed on acute methanol poisoning cases admitted to the loghman hakim hospital p...

in this work, several machine learning techniques are presented for nanofiltration modeling. according to the results, specific errors are defined. the rejection due to nanofiltration increases with pressure but decreases with increasing the concentration of chloride ion. methods of machine learning represent the rejection of nanofiltration as a function of concentration, ph, pressure and also ...

this experiment was conducted to evaluate the effects of salt stress on some agro-physiological traits in ten varieties of bread (triticum aestivum l.) and durum (triticum turgidum l.) wheats in seedling stage. a greenhouse experiment was carried out as a split plot experiment based on a completely randomized design with four replications in hydroponic condition. different agronomic and physiol...

the trace element contents on the surface originated from mineralization would depend to the thickness of the calcrete layer above the ore deposit on the surface. a very thick layer of calcrete may not allow for much dispersion of the elements of interest in the surface. these elements may be concentrated in non-magnetic and magnetic part of calcrete. based on the current research, mineralogica...

introduction: salivary calcium and phosphate levels might have a relationship with dental caries severity. evaluation of different indexes such as alkaline phosphatase, which increases salivary phosphate levels, and hydroxyapatite ion activity, which reflects salivary calcium and phosphate levels, might help determine the risk of dental caries. the aim of the present study was to compare saliva...