Spectrophotometric determination of boric acid in boron powder with curcumin
A rapid and accurate method was needed to determine trace amounts of boric acid for quality control and specification testing of elemental boron. The reaction between boric acid and curcumin occurs at a measurable rate only when the curcumin molecule is protonated. Protonation takes place at the carbonyl groups in the presence of a strong acid and occurs completely and rapidly when sulfuric acid is added to a solution of curcumin in acetic acid. Spectrophotometric measurements were made. The extraction of boric acid from boron powder was found to be complete within 2h when either water or the diol solution was used. Whatman No. 40 cr 42 filter paper was used to obtain diol samples free of boron particles. The extraction efficiency of 2-ethyl-1,3-hexanediol was evaluated by adding 1 ml of 500 ppM aqueous boric acid and 1 drop of 10% NaOH to accurately weighed samples of boron powder. The water then was evaporated at room temperature and the samples were extracted with diol solution. The data obtained are included. The extraction efficiency also was evaluated by determining the boric acid content of boron which had been recovered from a previous extraction and boric acid determination. The determination of boric acid using curcumin is unaffected by the presence of other compounds, except for fluoride and nitrate ions. 2 tables. (DP)
- Research Organization:
- Bendix Kansas City Div., MO
- DOE Contract Number:
- AC04-76DP00613
- OSTI ID:
- 5470928
- Journal Information:
- Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 51:14; ISSN ANCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400104* -- Spectral Procedures-- (-1987)
ACETIC ACID
ALCOHOLS
AROMATICS
BORIC ACID
BORON
CARBOXYLIC ACIDS
CHEMICAL ANALYSIS
CONTROL
CURCUMIN
DYES
ELEMENTS
ETHERS
EXTRACTION
GLYCOLS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
INORGANIC ACIDS
KETONES
MONOCARBOXYLIC ACIDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXYGEN COMPOUNDS
PHENOLS
POLYPHENOLS
QUALITY CONTROL
SEMIMETALS
SEPARATION PROCESSES
SPECIFICATIONS
SPECTROPHOTOMETRY
SULFURIC ACID
WATER