A Review of the Fourier Transform Near Infrared Spectrometer for the Determination of Non-Metals in Organic Compounds by Atomic Emission from an Atmospheric Pressure Argon Inductively Coupled Plasma

Abstract

The application of Fourier transform spectroscopy to argon inductively coupled plasma (ICP) atomic emissions of nonmetals, e.g. carbon, hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine, and sulfur, is reported in the spectral region from 15,800 to 10,000 cm-1(633 – 1000 nm). This type of Fourier transform near infrared (FT-NIR) investigation is potentially a very useful technique for the simultaneous monitoring of ICP excited atomic carbon [C(I)] emissions around 10,995 cm-1and 10,632 cm-1(909.5 nm), atomic hydrogen [H(I)] emission at 15,239 cm-1(656.2 nm), and atomic sulfur (S(I)) emissions around 10,855 cm-1(921.2 nm) deriving from organic molecules atomized in the hot ICP. Within the spectral region and reaction conditions used here, the ratio of atomic carbon to atomic hydrogen emission intensity (and got that matter other nonmetallic elements) is measured simultaneously from an interferometric scan. This gives potentially a very important technique for the determination of the chemical formula stoichiometry yet independent of the total number of hydrocarbon molecules originally injected. The technique appears to be capable of stoichiometry evaluating the empirical chemical formula of unknown organic compounds atomized in the ICP.