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
- Resource Relation:
- Other Information: Thesis
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ACTIVATED CARBON
REGENERATION
SORPTIVE PROPERTIES
CARBONATES
ADSORPTION
CHEMICAL PREPARATION
INFRARED SPECTRA
LIQUID COLUMN CHROMATOGRAPHY
NUCLEAR MAGNETIC RESONANCE
COBALT
COPPER
MERCURY
METALS
NICKEL
ORGANIC SULFUR COMPOUNDS
PYRAZOLINES
RESINS
SEAWATER
QUANTITATIVE CHEMICAL ANALYSIS
URANIUM
SOLVENT EXTRACTION
CHELATES
EXPERIMENTAL DATA
PH VALUE
TRACE AMOUNTS
WASTE WATER
ACTINIDES
ADSORBENTS
AZOLES
CARBON
CARBON COMPOUNDS
CHEMICAL ANALYSIS
CHROMATOGRAPHY
COMPLEXES
DATA
ELEMENTS
EXTRACTION
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
INFORMATION
LIQUID WASTES
MAGNETIC RESONANCE
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC POLYMERS
OXYGEN COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
POLYMERS
PYRAZOLES
RESONANCE
SEPARATION PROCESSES
SORPTION
SPECTRA
SURFACE PROPERTIES
SYNTHESIS
TRANSITION ELEMENTS
WASTES
WATER
400105* - Separation Procedures