The use of ion chromatography-dc plasma atomic emission spectrometry for the speciation of trace metals

Technical Report · Fri Sep 20 04:00:00 EDT 1991

DOI:https://doi.org/10.2172/5637324· OSTI ID:5637324

Urasa, I T

The original objects of this research program were: to interface d.c. plasma atomic emission spectrometer with an ion chromatograph; to characterize and optimize the combined systems for application in the speciation of metals in aqueous solutions; to use this system in the study of the solution chemistry of various metals; and to find ways in which the measurement sensitivity of the method can be enhanced, thereby allowing the detection of metal species at low ppb concentration levels. This approach has been used to study the chemistry of and speciate several elements in solution including: arsenic, chromium, iron, manganese, nickel phosphorus, platinum, selenium, and vanadium. During the course of this research, we have found that the solution chemistry of the elements studied and the speciation data obtained can vary considerably depending on the solution, and the chromatographic conditions employed. The speciation of chromium, iron, and vanadium was found to be highly influenced by the acidity of the sample. The element selective nature of the d.c. plasma detector allows these changes to be monitored, thereby providing quantitative information on the new moieties formed. New approaches are being developed including the use of chelating ligands as preconcentration agents for purposes of reducing further the detection limits of the elements of interest and to improve the overall element speciation scheme. New thrusts are being directed towards the employment of post-column derivatization method coupled with colorimetric measurements to detect and quantify metal species eluting from the chromatographic column. The influence of sample acidity on these investigations will be carefully evaluated. These new thrusts are described in the accompanying Project Renewal Proposal.

• Research Organization: Hampton Univ., VA (United States). Dept. of Chemistry
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG05-86ER13589
• OSTI ID: 5637324
• Report Number(s): DOE/ER/13589-4; ON: DE92010317
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105* -- Separation Procedures
440800 -- Miscellaneous Instrumentation-- (1990-)
47 OTHER INSTRUMENTATION
AQUEOUS SOLUTIONS
CHELATING AGENTS
CHEMICAL ANALYSIS
CHROMATOGRAPHY
CHROMIUM
DISPERSIONS
DOCUMENT TYPES
ELECTRIC DISCHARGES
ELEMENTS
EMISSION SPECTROSCOPY
FRACTIONATION
ION EXCHANGE CHROMATOGRAPHY
METALS
MIXTURES
PH VALUE
PLASMA
PROGRESS REPORT
SENSITIVITY
SEPARATION PROCESSES
SOLUTIONS
SPECTROSCOPY
TRANSITION ELEMENTS
VANADIUM