Use of direct current plasma as an element selective detector for simultaneous ion chromatographic determination of arsenic(III) and arsenic(V) in the presence of other common anions

Journal Article · Mon Jun 01 04:00:00 EDT 1987 · Anal. Chem.; (United States)

DOI:https://doi.org/10.1021/ac00138a017· OSTI ID:6418677

Urasa, I T; Ferede, F

Direct current plasma atomic emission spectrometry (DCPAES) was evaluated as an element selective method of detection (ESD) for ion chromatography (IC). By use of DCPAES, different species of a given element can be determined with identical measurement sensitivity. Those species that are separated in the chromatographic analytical column but are not detectable by conductivity detection, such as As(III), are easily detected by monitoring the atomic emission of a targeted element (in this case arsenic) in the chromatographic effluent. With the use of DCPAES, interference and other matrix effects are eliminated. Thus, a wide range of eluent composition can be employed without experiencing detector limitations. Reduction in detection capability as a result of dilution of the analyte during the chromatographic process can be offset by employing large (up to 1000..mu..L) sample injection loops or by using a concentrator column. With a concentrator column, the measurable concentration of arsenic was found to be 10 ppb with a detection limit of 2.5 ppb. These values are 3 orders of magnitude smaller than those determined when dc plasma is used in the uninterfaced mode. With the use of element selective detectors, element speciation can be facilitated considerably.

• Research Organization: Hampton Univ., VA
• OSTI ID: 6418677
• Journal Information: Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 59:11; 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
ANIONS
ARSENIC
CHARGED PARTICLES
CHEMICAL ANALYSIS
CHROMATOGRAPHY
DATA
ELEMENTS
ELUTRIATION
EMISSION SPECTROSCOPY
EXPERIMENTAL DATA
INFORMATION
IONS
LIQUID COLUMN CHROMATOGRAPHY
NUMERICAL DATA
PLASMA
QUANTITATIVE CHEMICAL ANALYSIS
SEMIMETALS
SENSITIVITY
SEPARATION PROCESSES
SPECTROSCOPY
TRACE AMOUNTS
VALENCE