Liquid chromatographic determination of nitrilotriacetic acid, ethylenediaminetetraacetic acid, and related aminopolycarboxylic acids using an amperometric detector
Journal Article
·
· Anal. Chem.; (United States)
An amperometric detector employing a carbon-paste electrode is used to determine aminopolycarboxylic acids, including nitrilotriacetic acid (NTA) to determine aminopolycarboxylic acids, including nitrilotriacetic acid (NTA) and ethylenediaminetetraacetic acid (EDTA), after liquid chromatographic separation on a reversed-phase column with an aqueous trichloroacetic acid mobile phase at pH lower than 2. The aminopolycarboxylic acids are directly oxidized at the detector electrode without involving an intermediate species. Glycine, iminodiacetic acid, common amino acids, citric acid, and fulvic acids do not interfere with the determination of NTA and EDTA. The low mobile-phase pH limits interference from metal ions in natural waters. Where such interference occurs, a stronger chelating reagent (e.g. diethylenetriaminepentaacetic acid (DPTA) can be used to suppress it. NTA and EDTA in aqueous samples, including waste water treatment plant influent and effluent, can be determined without prior sample preparation. The minimum detectable amounts are 0.1 ppm for NTA and 0.15 ppm for EDTA with a precision of less than 7% relative standard deviation.
- Research Organization:
- Univ. of Maryland, College Park
- OSTI ID:
- 5523524
- Journal Information:
- Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 60:4; ISSN ANCHA
- Country of Publication:
- United States
- Language:
- English
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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
AMINO ACIDS
AMPEROMETRY
CARBOXYLIC ACIDS
CHELATING AGENTS
CHEMICAL ANALYSIS
CHROMATOGRAPHY
DATA
EDTA
EXPERIMENTAL DATA
HYDROGEN COMPOUNDS
INFORMATION
LIQUID COLUMN CHROMATOGRAPHY
NTA
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PH VALUE
QUANTITATIVE CHEMICAL ANALYSIS
SEPARATION PROCESSES
TITRATION
TRACE AMOUNTS
WATER
400102* -- Chemical & Spectral Procedures
400105 -- Separation Procedures
520200 -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AMINO ACIDS
AMPEROMETRY
CARBOXYLIC ACIDS
CHELATING AGENTS
CHEMICAL ANALYSIS
CHROMATOGRAPHY
DATA
EDTA
EXPERIMENTAL DATA
HYDROGEN COMPOUNDS
INFORMATION
LIQUID COLUMN CHROMATOGRAPHY
NTA
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PH VALUE
QUANTITATIVE CHEMICAL ANALYSIS
SEPARATION PROCESSES
TITRATION
TRACE AMOUNTS
WATER