Emission spectrochemical analyzer

• US 4,743,111 A
• Filed: 09/07/1984
• Issued: 05/10/1988
• Est. Priority Date: 09/09/1983
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Koizumi, Hideaki
• Primary Examiner(s): Evans, F. L.
• Application Number:
  US06/648,261
• Time in Patent Office: 1,341 Days
• Field of Search: 356/307, 356/311, 356/312, 356/315, 356/316, 356/51
• US Class Current: 356/316
• CPC Class Codes: G01J 2003/1252 Using "resonance cell", e.g. Na vapor
• CPC Class Codes: G01N 2021/3111 using Zeeman split
• CPC Class Codes: G01N 21/73 using plasma burners or torches

Abstract

An improved emission spectrochemical analyzer is disclosed in which light from a sample in high-temperature plasma is led to an absorption cell, a magnetic field is applied to the absorption cell to utilize the Zeeman effect, the absorption cell is further pressurized to make the width of the absorption line of a desired element equal to the width of the resonance emission line of the element, and only the resonance emission line of the element is selected by appropriate modulation means and detected at high sensitivity.

Claims

1. An emission spectrochemical analyzer including a light emitting part where a sample is introduced into inductively coupled plasma for emitting an atomic emission line therefrom, an atomic absorption part in which a desired element is introduced and is disposed on the path of the atomic emission line from the light emitting part and applied with a magnetic field, and a measuring part for measuring the intensity of the atomic emission line having passed through the atomic absorption part, wherein the pressure of the inner atmosphere of the atomic absorption part is increased to enlarge the width of an atomic absorption line of the desired element.

2. An emission spectrochemical analyzer according to claim 1, wherein the atomic absorption line at the atomic absorption part matches the atomic emission line in line width.

3. An emission spectochemical analyzer according to claim 1, wherein the pressure of the inner atmosphere of the atomic absorption part is adjusted so that the width of the atomic absorption line at the atomic absorption part is substantially equal to the width of the atomic emission line.

4. An emission spectrochemical analyzer according to claim 1, wherein the light emitting part emits a broad atomic emission line, the atomic absorption part without an increase of the pressure of the inner atmosphere thereof providing an atomic absorption line of the desired element having a width which is substantially narrower than the width of the atomic emission line, the pressure of the inner atmosphere of the atomic absorption part being increased to enlarge the width of the atomic absorption line of the desired element so as to substantially match the atomic emission line emitted by the light emitting part in line width thereby enabling an increase in detection sensitivity.

5. An emission spectrochemical analyzer comprising light emitting means where a sample is introduced into inductively coupled plasma for emitting an atomic emission line therefrom, atomic absorption means in which a desired element is introduced and which is disposed on the path of the atomic emission line from the light emitting means and applied with a magnetic field, and measuring means for measuring the intensity of the atomic emission line having passed through the atomic absorption means, the atomic absorption means being provided with an inner pressure which is increased to a value sufficient to enlarge the width of an atomic absorption line of the desired element to thereby absorb the atomic emission line.

6. An emission spectrochemical analyzer according to claim 5, wherein the atomic absorption means is provided with a pressure having a value so as to enable the atomic absorption line at the atomic absorption means to match the atomic emission line in line width.

7. An emission spectrochemical analyzer according to claim 5, wherein the atomic absorption means is provided with a pressure having a value sufficient to enable the width of the atomic absorption line at the atomic absorption means to be substantially equal to the width of the atomic emission line.

8. An emission spectrochemical analyzer according to claim 5, wherein the light emitting means emits a broad atomic emission line, the atomic absorption means without an increase of the pressure of the inner atmosphere thereof providing an atomic absorption line of the desired element having a width which is substantially narrower than the width of the atomic emission line, the pressure of the inner atmosphere of the atomic absorption means being increased to enlarge the width of the atomic absorption line of the desired element so as to substantially match the atomic emission line emitted by the light emitting means in line width thereby enabling an increase in detection sensitivity.