A method and system for the suppression and/or modulation of absorption spectrum artifacts for the purpose of gas detection and concentration measurements using at least one magnetic, electric or electromagnetic field. A field applied selectively to at least one section of the system modulates absorption by influencing quantum energy state transitions of gas species.

There are provided an atomic absorption photometer and an atomic absorption measurement method which can easily perform background correction in a short time period by using a plurality of types of methods while suppressing the amount of samples consumed. Background correction is performing by using each of the D2 lamp method, the Zeeman method, and a self-reversal method, according to measurement data in each of measurement periods T41 to T46 obtained in one data acquisition cycle. Background correction is performed on the common measurement data (atomic absorption data) obtained in the atomic absorption measurement period T41, by using the measurement data (background data) obtained in each of the first to third background measurement periods T44, T46, and T42.

An atomic absorption spectrophotometer includes a first holder, a fixed portion, and a movable portion. In an inner circumferential surface of the fixed portion, a first female thread portion is formed from an end on a rear side toward a front side in a direction of fitting of the fixed portion to the first holder, and a small-diameter portion having an inner diameter smaller than a minimum diameter of the first female thread portion is formed while it is located on the front side in the direction of fitting with respect to the first female thread portion. In an inner circumferential surface of the movable portion, a second female thread portion having a minimum diameter larger than a maximum diameter of the first female thread portion is formed from an end on the rear side toward the front side in the direction of fitting of the movable portion.

There are provided an atomic absorption photometer and an atomic absorption measurement method which can easily perform background correction in a short time period by using a plurality of types of methods while suppressing the amount of samples consumed. Background correction is performing by using each of the D2 lamp method, the Zeeman method, and a self-reversal method, according to measurement data in each of measurement periods T41 to T46 obtained in one data acquisition cycle. Background correction is performed on the common measurement data (atomic absorption data) obtained in the atomic absorption measurement period T41, by using the measurement data (background data) obtained in each of the first to third background measurement periods T44, T46, and T42.

The invention relates to analytical chemistry, in particular, to the spectral absorption analysis with a differential method of measuring concentrations of mercury and benzene vapors. The invention is aimed at creation of an absorption analyzer, which allows to determine the content of mercury and benzene in the carrier gas, with improved analytical performance for benzene. The aim is achieved with an absorption analyzer, which comprises optically coupled components: a photodetector, an analytical cell, a modulator of radiation polarization and a spectral lamp containing a discharge cavity located between magnet poles and connected with means of electric discharge excitation, buffer gas and mercury placed into the spectral lamp, as well as a gas system connecting a sampling port of the analyzer with an input port of the analytical cell by gas communications, wherein the gas system comprises at least three gas channels connecting the sampling port of the analyzer to the input port of the analytical cell via a gas channels selector, while at least one of these gas channels comprises means for removing the benzene from the gas stream, at least one comprises means for removing mercury from the gas stream, at least one is permeable for mercury, at least one is permeable for benzene and at least one has different permeability rates for mercury and benzene.

The invention relates to analytical chemistry, in particular, to the spectral absorption analysis with a differential method of measuring concentrations of mercury and benzene vapors.

The invention is aimed at creation of an absorption analyzer, which allows to determine the content of mercury and benzene in the carrier gas, with improved analytical performance for benzene.

The aim is achieved with an absorption analyzer, which comprises optically coupled components: a photodetector, an analytical cell, a modulator of radiation polarization and a spectral lamp containing a discharge cavity located between magnet poles and connected with means of electric discharge excitation, buffer gas and mercury placed into the spectral lamp, as well as a gas system connecting a sampling port of the analyzer with an input port of the analytical cell by gas communications, wherein the gas system comprises at least three gas channels connecting the sampling port of the analyzer to the input port of the analytical cell via a gas channels selector, while at least one of these gas channels comprises means for removing the benzene from the gas stream, at least one comprises means for removing mercury from the gas stream, at least one is permeable for mercury, at least one is permeable for benzene and at least one has different permeability rates for mercury and benzene.

3 figures.

An atomic absorption spectrophotometer includes a first holder, a fixed portion, and a movable portion. In an inner circumferential surface of the fixed portion, a first female thread portion is formed from an end on a rear side toward a front side in a direction of fitting of the fixed portion to the first holder, and a small-diameter portion having an inner diameter smaller than a minimum diameter of the first female thread portion is formed while it is located on the front side in the direction of fitting with respect to the first female thread portion. In an inner circumferential surface of the movable portion, a second female thread portion having a minimum diameter larger than a maximum diameter of the first female thread portion is formed from an end on the rear side toward the front side in the direction of fitting of the movable portion.