Trace analysis by direct spectrophotometric measurements on polyurethane foam. Determination of chromium(VI) as blue perchromic acid with unloaded and tri-n-butylphosphate loaded foam

Journal Article · Mon Jan 01 00:00:00 EST 1990 · Analytical Letters; (United States)

DOI:https://doi.org/10.1080/00032719008052475· OSTI ID:5758404

El-Wakil, A M; Farag, A B ^[1]; El-Shahawi, M S ^[2]

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1. Mansoura Univ. (Egypt)
2. Mansoura Univ., Damietta (Egypt)

The formation of blue perchromic acid represents one of the most sensitive and selective tests for the identification of chromium. The sorption of perchromic acid on TBP loaded foam has been investigated for the detection, semiquantitative and quantitative determinations of chromium(VI). In foam batch method, it was possible to detect as low as 0.6, 0.4 and 0.2 ppm of chromium(VI) with unloaded or tricaprylylamine loaded foams, TBP-amine-loaded foams and TBP loaded foams, respectively. The selectivity of the proposed TBP loaded foam test for the detection of chromium(VI) in the presence of diverse interfering ions was also investigated. In addition, it was possible to determine chromium(VI) semiquantitatively by comparing the color of the foam cube with a prepared standard color scale. The proposed method has been employed for the determination of chromium(VI) in tap water. A method for the direct and quantitative spectrophotometric determination of chromium(VI) TBP-loaded foam parallepipeds has been developed. The TBP-perchromic acid has a maximum absorbance at 580 nm which is quite identical to the absorption maxima in TBP solution. The present method was applied for the analysis of chromium(VI) in natural water and satisfactory results were obtained.

• OSTI ID: 5758404
• Journal Information: Analytical Letters; (United States), Vol. 23:4; ISSN 0003-2719
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
54 ENVIRONMENTAL SCIENCES
CHROMIUM OXIDES
ABSORPTION SPECTROSCOPY
AMINES
CHROMIUM
EXPERIMENTAL DATA
INTERFERING ELEMENTS
PLASTIC FOAMS
POLYURETHANES
QUANTITATIVE CHEMICAL ANALYSIS
SUBSTRATES
TBP
TRACE AMOUNTS
WATER
BUTYL PHOSPHATES
CHALCOGENIDES
CHEMICAL ANALYSIS
CHROMIUM COMPOUNDS
COLLOIDS
DATA
DISPERSIONS
ELEMENTS
ESTERS
FOAMS
HYDROGEN COMPOUNDS
INFORMATION
MATERIALS
METALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
ORGANIC POLYMERS
OXIDES
OXYGEN COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
PHOSPHORIC ACID ESTERS
PLASTICS
POLYAMIDES
POLYMERS
SPECTROSCOPY
SYNTHETIC MATERIALS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
400102* - Chemical & Spectral Procedures
540220 - Environment
Terrestrial- Chemicals Monitoring & Transport- (1990-)
540320 - Environment
Aquatic- Chemicals Monitoring & Transport- (1990-)