Masking, chelation, and solvent extraction for the determination of sub-parts-per-million levels of trace elements in high iron and salt matrices
Journal Article
·
· Anal. Chem.; (United States)
The ammonium pyrrolidine-N-carbodithioate (APCD or APDC) and a 4-methyl-2-pentanone (methyl isobutyl ketone or MIBK) system for the chelation and extraction of transition metals was investigated over the pH range of 0 < pH < 12. This system eliminated the interferences associated with high total dissolved solids. The masking effects of ammonium citrate and Tiron (4,5-dihydroxybenzene-1,3-disulfonic acid) were investigated for the extraction of Cd/sup 2 +/, Co/sup 2 +/, Cu/sup 2 +/, Cr/sup 3 +/, Cr/sup 6 +/, Hg/sup 2 +/, Ni/sup 2 +/, Pb/sup 2 +/, Tl/sup +/, and Zn/sup 2 +/. Iron was effectively masked by citrate and Tiron above pH 8.0 and 6.5, respectively. All of the metals investigated, except Cr/sup 3 +/ and Cr/sup 6 +/, were efficiently extracted by the APCD-MIBK system. The addition of NaCl as a salting-out agent made it possible to concentrate the metals from 20 volumes of aqueous sample into one volume of organic solvent. This enabled Cd/sup 2 +/, Co/sup 2 +/, Cu/sup 2 +/, Ni/sup 2 +/, Pb/sup 2 +/, and Zn/sup 2 +/ to be determined at the parts-per-billion level by flame atomic absorption spectroscopy.
- Research Organization:
- Los Alamos National Lab., NM
- OSTI ID:
- 5569540
- Journal Information:
- Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 58:7; ISSN ANCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400104 -- Spectral Procedures-- (-1987)
400105* -- Separation Procedures
ABSORPTION SPECTROSCOPY
CADMIUM
CATIONS
CHARGED PARTICLES
CHELATES
CHELATING AGENTS
CHROMIUM
COBALT
COMPLEXES
COPPER
DATA
ELEMENTS
EXPERIMENTAL DATA
EXTRACTION
INFORMATION
IONS
LEAD
MERCURY
METALS
NICKEL
NUMERICAL DATA
ORGANIC COMPOUNDS
PH VALUE
SEPARATION PROCESSES
SOLVENT EXTRACTION
SPECTROSCOPY
THALLIUM
TRACE AMOUNTS
TRANSITION ELEMENTS
ZINC
400104 -- Spectral Procedures-- (-1987)
400105* -- Separation Procedures
ABSORPTION SPECTROSCOPY
CADMIUM
CATIONS
CHARGED PARTICLES
CHELATES
CHELATING AGENTS
CHROMIUM
COBALT
COMPLEXES
COPPER
DATA
ELEMENTS
EXPERIMENTAL DATA
EXTRACTION
INFORMATION
IONS
LEAD
MERCURY
METALS
NICKEL
NUMERICAL DATA
ORGANIC COMPOUNDS
PH VALUE
SEPARATION PROCESSES
SOLVENT EXTRACTION
SPECTROSCOPY
THALLIUM
TRACE AMOUNTS
TRANSITION ELEMENTS
ZINC