Trace enrichment and separation of metal ions as dithiocarbamate complexes by liquid chromatography
A method is presented that involves the simultaneous formation of metal dithiocarbamates and on-line preconcentration and, subsequently, separation of heavy-metal ions (Cd(II), Pb(II), Hg(II), Cu(II), Co(II), Ni(II), Bi(III)) by reversed-phase liquid chromatography. A cetrimide-dithiocarbamate ion pair is loaded onto a precolumn packed with C/sub 18/-bonded silica, and the injected metal ions react instantaneously with the dithiocarbamate to form stable complexes. These relatively apolar complexes are efficiently preconcentrated on the precolumn. They can be eluted on-line to C/sup 18/ separation column and, next, separated with an acetonitrile/water gradient containing cetrimide and buffered to pH 6.8. The detection is effected with a UV-vis diode-array detector which allows the determination of subnanogram amounts of metal ions. The cleanup, preconcentration, and automation potential render the method suitable for multimetal analysis in complex samples. Application of this principle to the trace analysis of Cu(II) and Hg(II) in drinking water is demonstrated.
- Research Organization:
- Free Univ., Amsterdam, Netherlands
- OSTI ID:
- 6954055
- Journal Information:
- Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 59:1; ISSN ANCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400102* -- Chemical & Spectral Procedures
CARBAMATES
CARBONIC ACID DERIVATIVES
CARBOXYLIC ACID SALTS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHROMATOGRAPHY
COMPLEXES
COPPER
DATA
DITHIOLS
DRINKING WATER
ELEMENTS
EXPERIMENTAL DATA
HYDROGEN COMPOUNDS
INFORMATION
LIQUID COLUMN CHROMATOGRAPHY
MERCURY
METALS
MINERALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
QUANTITATIVE CHEMICAL ANALYSIS
REAGENTS
SEPARATION PROCESSES
SILICA
SILICON COMPOUNDS
SILICON OXIDES
THIOLS
TRACE AMOUNTS
TRANSITION ELEMENTS
WATER