Concentration and separation of trace metal ions by reversed-phase adsorption chromatography. [bis(2-hydroxyethyl)dithiocarbamate (HEDC), 1,3-dimethyl-4-acetyl-2-pyrazolin-5-one (DMAP)]
The concentration and separation of trace metal ions chelated with either bis(2-hydroxyethyl)dithiocarbamate (HEDC) or 1,3-dimethyl-4-acetyl-2-pyrazolin-5-one (DMAP) by reversed-phase adsorption chromatography has been studied. The concentration of metals of the hydrogen sulfide group from very dilute solution by chelation with HEDC and subsequent adsorption on a small column of Amberlite XAD-4 resin is described. Selectivity is achieved by pH adjustment or by the use of masking agents. The metal chelates are eluted from the column with acidic ethanol and determined by AAS. The adsorption properties of five XAD resins and three activated carbons have been studied for removing metal ions chelated with HEDC from industrial wastewater. Amberlite XAD-4 and Nuchar WV-B activated carbon were found to have the highest adsorption capacities. The adsorbents can be regenerated with methanol. The HEDC chelates of Co(III), Cu(II), Ni(II), and Hg(II) have been separated by reversed-phase HPLC. Co(III), Cu(II), and Ni(II) can be determined in the range of 0.005 to 10.0 mg/L, while Hg(II) can be determined in the range of 0.02 to 25 g/L after an on-line preconcentration step. The synthesis and characterization of DMAP is described. The UO2(DMAP)2 chelate has been prepared and characterized. A procedure for concentrating trace amounts of U(VI) chelated with DMAP onto XAD-4 resin is described. 262 refs., 45 figs., 21 tabs.
- Research Organization:
- Ames Lab., IA (USA)
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 6196394
- Report Number(s):
- IS-T-1198; ON: DE86006374
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400105* -- Separation Procedures
ACTINIDES
ACTIVATED CARBON
ADSORBENTS
ADSORPTION
AZOLES
CARBON
CARBON COMPOUNDS
CARBONATES
CHELATES
CHEMICAL ANALYSIS
CHEMICAL PREPARATION
CHROMATOGRAPHY
COBALT
COMPLEXES
COPPER
DATA
ELEMENTS
EXPERIMENTAL DATA
EXTRACTION
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
INFORMATION
INFRARED SPECTRA
LIQUID COLUMN CHROMATOGRAPHY
LIQUID WASTES
MAGNETIC RESONANCE
MERCURY
METALS
NICKEL
NONMETALS
NUCLEAR MAGNETIC RESONANCE
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC POLYMERS
ORGANIC SULFUR COMPOUNDS
OXYGEN COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
PH VALUE
POLYMERS
PYRAZOLES
PYRAZOLINES
QUANTITATIVE CHEMICAL ANALYSIS
REGENERATION
RESINS
RESONANCE
SEAWATER
SEPARATION PROCESSES
SOLVENT EXTRACTION
SORPTION
SORPTIVE PROPERTIES
SPECTRA
SURFACE PROPERTIES
SYNTHESIS
TRACE AMOUNTS
TRANSITION ELEMENTS
URANIUM
WASTE WATER
WASTES
WATER