Determination of chromium(III) and chromium(VI) by ammonium pyrrolidinecarbodithioate-methyl isobutyl ketone furnace atomic absorption spectrometry

Journal Article · Fri Jan 01 04:00:00 EST 1988 · Anal. Chem.; (United States)

DOI:https://doi.org/10.1021/ac00152a004· OSTI ID:5572759

Subramanian, K S

The solution conditions and other parameters affecting the ammonium pyrrolidinecarbodithioate-methyl isobutyl ketone (APCD-MIBK) extraction system for the graphite furnace atomic absorption spectrometric determination of Cr(III) and Cr(VI) have been studied in detail. The parameters studied include pH of the aqueous phase prior to extraction, concentration of APDC, concentration of the potassium hydrogen phthalate buffer, the length of time needed for complete extraction, and the time-stability of the chelate in the organic phase. On the basis of these studies, procedures have been developed for the selective determination of Cr(VI), and the simultaneous determination of (Cr(III) + Cr(VI)) without the need to convert Cr(III) to Cr(VI). The value of Cr(III) is obtained by difference. The methods have been applied to the determination of Cr(III), Cr(VI), and (Cr(III) + Cr(VI)) in some natural and drinking water samples. The detection limits (3 standard deviations of blank) for Cr(III) and Cr(VI) are the same and found to be 0.3 ng/mL in the MIBK phase. Data are presented on accuracy, precision, and interference.

• Research Organization: Health and Welfar Canada, Ottawa, Ontario
• OSTI ID: 5572759
• Journal Information: Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 60:1; ISSN ANCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
400105* -- Separation Procedures
520200 -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ABSORPTION SPECTROSCOPY
ACCURACY
AMINES
AMMONIUM COMPOUNDS
AZOLES
CHELATES
CHEMICAL ANALYSIS
CHROMIUM
COMPLEXES
DATA
ELEMENTS
EXPERIMENTAL DATA
EXTRACTION
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
INFORMATION
INTERFERING ELEMENTS
KETONES
MATERIALS
MEDIUM TEMPERATURE
METALS
METHYL ISOBUTYL KETONE
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PH VALUE
PYRROLES
PYRROLIDINES
QUANTITATIVE CHEMICAL ANALYSIS
QUANTITY RATIO
SEPARATION PROCESSES
SOLVENT EXTRACTION
SOLVENT PROPERTIES
SPECTROSCOPY
TIME DEPENDENCE
TOXIC MATERIALS
TRACE AMOUNTS
TRANSITION ELEMENTS
VALENCE
WATER