Chloride interferences in graphite furnace atomic absorption spectrometry

Journal Article · Wed Feb 01 04:00:00 EST 1984 · Anal. Chem.; (United States)

DOI:https://doi.org/10.1021/ac00266a011· OSTI ID:5965588

Slavin, W; Carnrick, G R; Manning, D C

The premature loss of analyte as a volatile halide is shown to be an important interference in some situations. When this char step interference is avoided, an interference in the atomization step can arise when large amounts of halide are present during that step. This atomization interference results from the binding of the analyte as a vapor phase metal halide, thereby preventing some portion of the analyte from absorbing atomic radiation. This vapor phase interference can be circumvented in several ways. The most convenient is the use of high concentrations of HNO/sub 3/ or H/sub 2/SO/sub 4/ which drives off more of the chloride as HCl during the dry and char steps. As much CaCl/sub 2/ in solution as 1 mg reduced the Mn signal in the presence of HNO/sub 3/ and Mg(NO/sub 3/)/sub 2/ by only 15%. Analogous experience was found with Tl. We believe the experience is quite general. The halide which interferes in the vapor phase is retained from the char step by adsorption or intercalation on the graphite tube. Thus we can expect still further improvements in the handling of large amounts of halide matrix when glassy carbon or solid pyroltic tubes become available.

• Research Organization: Perkin-Elmer Corp., Norwalk, CT
• OSTI ID: 5965588
• Journal Information: Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 56:2; ISSN ANCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400104* -- Spectral Procedures-- (-1987)
ABSORPTION SPECTROSCOPY
CARBON
CHEMICAL ANALYSIS
CHLORIDES
CHLORINE COMPOUNDS
DATA
ELECTRIC FURNACES
ELEMENTAL MINERALS
ELEMENTS
EXPERIMENTAL DATA
FLUIDS
FURNACES
GASES
GRAPHITE
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ACIDS
MINERALS
NITRIC ACID
NONMETALS
NUMERICAL DATA
PHASE TRANSFORMATIONS
QUANTITATIVE CHEMICAL ANALYSIS
SIGNAL-TO-NOISE RATIO
SPECTROSCOPY
SULFURIC ACID
VAPORS