Complexation of eriochromcyanine R with aluminum and iron (III) ions in the presence of sufractants

The effect of various types of surfactants on the complexation of aluminum and iron (III) ions with eriochromecyanine R have been studied. According to the light absorption spectra of the dye and complexes with metal ions without surfactants and in the presence of catamine AB, oxyphos B, and syntanol DS-10 at various pH and the concentration of surfactants determined the optimal conditions for complexation have been determined. Oxyphos B has a negative effect on the spectrophotometric characteristics of the complexes. Syntanol DS-10 has practically no effect. The presence of catamine AB causes a bathochromic shift in the maximum of light absorption of the complex, increases the contrast of the photometric reaction and the value of the extinction coefficient. The composition of the complexes in the absence and in the presence of catamine AB has been determined by saturation and isomolar series methods. The presence of catamine AB increases the molar ratio of metal: reagent in the complex from 1: 2 to 1: 3. By Babko's method, conditional stability constants of the complexes have been determined, calibration curves have been constructed, and molar light absorption coefficients have been calculated.

Influence of surfactances on the spectrophotometric characteristics of scandium complexes with eriochromcianine R

The effect of various types of surfactants on the complexation of scandium ions with eriochromecyanine R. The optimal conditions were determined from the light absorption spectra of the dye and complexes with metal ions without surfactants and in the presence of catamine AB, oxyphos B and syntanol DS-10 at various pH values and surfactant concentrations complexation. The presence of catamine AB causes a bathochromic shift in the maximum of light absorption of the complex, increases the contrast of the photometric reaction and the value of the extinction coefficient. The composition of the complexes in the absence and in the presence of catamine AB was determined by saturation and iso- molar series methods. It also increases the molar ratio of Sc : eriochromecyanine R in the complex from 1:2 to 1:3. The conditional stability constants of the complexes were determined by Babko's method, calibration curves were constructed, and the coefficients of molar light absorption were calculated. Oxyphos B has a negative effect on the spectrophotometric characteristics of the complexes. Syntanol DS-10 has practically no effect.

Spectrophotometric Studies of Ternary Complexes of Erbium to Explore the Hyperchromic Effect with Various Ligands and their use in Microdetermination

A comprehensive spectrophotometric study is undertaken for ternary complexes of higher rare earth element Erbium with ethylene diamine tetra acetic acid ( EDTA), hydroxyl ethylene diamine triacetic acid (HEDTA), trans 1, 2, cyclohexane diamine tetra acetic acid (CYDTA) and ethylene glycol bis (2-amino ethylene) N,N1,N11,N1 1 1 tetra acetic acid (EGTA) as primary ligand and the binary ligands used are Maltol, Tiron, Kojic acid and α-Picolinic acid. The ternary complexes shows hyperchromic effect as compare to primary complexes which is exploited to determine the stoichiometry of ternary complexes and it is found to be 1:1:1. The conditional stability constants (Ks1) are corrected using k H values of ligands. The order of stability with the series of ligands in different systems is deduced as EDTA and HEDTA: α Picolinic acid >Tiron> Kojic acid > Maltol and CYDTA and EGTA: α Picolinic acid > Kojic acid > Tiron > Maltol. The % increase in molar coefficients of mixed ligand complexes of Erbium is significant which can facilitates the analytical measurements for its micro determination.

Ion Flotation of La3+, Cd2+, and Cs+ using Monorhamnolipid Collector

Water scarcity is a global issue that is expected to continue increasing in importance in the coming decades. Reclaimed water is one important source available to meet future needs. The reclamation process for wastewaters, particularly from industrial sources, involves the need to remove low-level contaminants. Here we report the efficacy of an ion flotation process that uses the biosurfactant monorhamnolipid as a metal collector to recover Cs+, Cd2+, and La3+ from water. These elements were tested at collector-to-colligend ratios of 2, 5, and 10. The collector-to-colligend ratio and metal valence play a large role in determining flotation success with removal efficiencies varying widely. The maximum removal efficiency for the metals when floated individually were 46.2, 99.8, and 98.6% for Cs+, Cd2+, and La3+, respectively. When mixed together at near equimolar concentrations removal efficiencies were 39.4, 98.4, and 88.1%, respectively. Removal efficiency for Cs+, Cd2+, and La3+ were up to 49.9, 99.5, and 51.5% when mixed at a ratio of 200:10:1, whereas conditional stability constants predict a removal order of La3+ > Cd2+> Cs+. Future research should examine parameters, including pH and ionic strength, that may affect the flotation process as well as actual metal-contaminated waste streams to evaluate the usefulness of this technology.

Fluorescence Analysis of Cu(II), Pb(II) and Hg(II) Ion Binding to Humic and Fulvic Acids

The aim of this work was to study molecular and quantitative aspects of metal ion binding to humic substances (HS). The object of our study was characterization of two standards of humic substances (Elliott Soil standard HA 1S102H and Elliott Soil standard FA 2S102F). All samples of IHSS standards HS were characterized by elemental analysis (EA), ultraviolet-visible spectroscopy (UV/Vis), Fourier transform infrared spectroscopy (FTIR) and steady-state fluorescence spectroscopy. Chemical parameters on the complexation of Cu (II), Pb(II) and Hg(II), including the conditional stability constants and the percentage of fluorophores participating in the complexation, were estimated by the modified Stern–Volmer equation. The stability constants (log Ka) of Me(II)–ESHS complexes range from 3.70 to 5.15 in the order: Hg–ESHA>Cu–ESHA>Pb–ESHA>Cu–ESFA>Pb–ESFA. With respect to the ESHA, ESFA, which showed the smallest contents of O-containing functional groups (e.g. hydroxyl, carbonyl, ester, especially carboxyl groups on the aromatic ring) and the lowest humification degree, the ESFA was characterized by much smaller stability constants. Our findings suggest that soil HS belongs to class of important organic ligands for complexation with heavy metal ions and may significantly affect the chemical forms, mobility, bioavailability and ecotoxicity of heavy metals in the soil environment.

TRLFS study on the complexation of Cm(iii) and Eu(iii) with SO3-Ph-BTBP

Cm(iii) and Eu(iii) complexes with SO3-Ph-BTBP are investigated. The stoichiometry and the conditional stability constants are determined revealing an important influence of the applied medium.