Atomic absorption spectrophotometer

• US 4,718,763 A
• Filed: 04/07/1986
• Issued: 01/12/1988
• Est. Priority Date: 04/08/1985
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Oishi, Kounosuke, Yasuda, Kazuo, Koga, Masataka
• Primary Examiner(s): EVANS, FANNIE L
• Application Number:
  US06/848,460
• Time in Patent Office: 645 Days
• Field of Search: 356/307, 356/311, 356/312, 356/315, 356/316, 356/319, 356/326, 356/328
• US Class Current: 356/326
• CPC Class Codes: G01N 2021/3111 using Zeeman split
• CPC Class Codes: G01N 21/3103 Atomic absorption analysis

Abstract

There is provided an atomic absorption spectrophotometer wherein a magnetic field having a suitable value is applied to a light source radiating the emission spectral light of the atom to be analyzed in the advance direction of the radiated light in order to cause the Zeeman effect so that the wavenumber of a component which is included in the spectra shifted in wavenumber and which is varied to have a smaller wavenumber may coincide with or approach the wavenumber whereat the absorption spectrum is maximized, thereby the sensitivity of the atomic absorption being raised, the linear region of the working curve being improved, and the emission spectral light being stabilized.

Claims

1. An atomic absorption spectrophotometer comprising:

means for atomizing a sample;

a light source for emitting an emission spectral light ray of an atom to be analyzed toward said sample atomized by said atomizing means;

magnet means for supplying a magnetic field to said light source to cause the Zeeman effect, said magnet means including means for supplying said light source with a magnetic field having such a magnitude as to generate an emission spectrum having a peak at a wavenumber substantially equal to the wavenumber whereat the absorption spectrum of said atom to be analyzed is maximized;

means for measuring the intensity of the atomic spectrum of said atom to be analyzed which has been transmitted through said atomized sample so as to enable expansion of the linear range of a working curve of absorbance versus concentration; and

means for determining the absorbance of said atom to be analyzed in accordance with the working curve on the basis of the measurement reults by said measuring means.

2. An atomic absorption spectrophotometer according to claim 1, wherein said magnet means includes means for supplying a magnetic field in the substantially same direction as the advance direction of the light radiated from said light source.

3. An atomic absorption spectrophotometer according to claim 1, wherein said measuring means includes means for measuring only the wavenumber section around the maximum of said absorption spectrum.

4. An atomic absorption spectrophotometer according to claim 1, wherein said magnet means enables shifting of the wavenumber of the emission spectrum so as to increase an area of an overlap region between the emission spectrum and the absorption spectrum, said measuring means effecting measurement in the area of the overlap region whereat the absorption spectrum of said atom to be analyzed is maximized for enabling expansion of the linear region of the working curve.