Provided herein are cellulose acetate tow bands having less than 0.1 wt. % titanium dioxide, wherein the content of titanium dioxide is measured by ashing and/or by titanium particle count density. Also provided herein is a method of measuring the titanium dioxide content of cellulose acetate tow by ashing. Also provided herein is a method for measuring the color of cellulose acetate tow.

A device for simultaneously measuring mercury, cadmium, zinc, and lead is provided, including: a gas generating device; a quartz analysis tube connected to the gas generating device, and the quartz analysis tube includes a sample heating zone, a high-temperature packing zone and a quartz collimating tube; an atomic absorption detection device AA1 arranged behind the quartz analysis tube, where the atomic absorption detection device includes an atomic absorption detector, a flame, and a light source; a quartz catalytic tube arranged behind the atomic absorption detection device, where the quartz catalytic tube includes a flame buffer zone and an adsorption packing zone; and an atomic absorption mercury measuring device arranged behind the quartz catalytic tube, where the atomic absorption mercury measuring device includes a mercury enrichment tube, an atomic absorption detector AA2 and an air pump.

The present invention discloses a device for testing control of polymorphic foam on flowing fire, comprising a test bench, a combustible liquid injecting mechanism and a polymorphic foam spraying mechanism. The combustible liquid injecting mechanism and the polymorphic foam spraying mechanism are relatively arranged on the test bench. The combustible liquid injecting mechanism can spray combustible liquid to the test bench. The polymorphic foam spraying mechanism can spray polymorphic foam to the test bench, and the spraying direction of the polymorphic foam is relative to the spraying direction of the combustible liquid. The present invention can be used for testing and observing cut-off and control effects of polymorphic foam on combustible liquid flowing fire.

The present invention discloses a device for testing control of polymorphic foam on flowing fire, comprising a test bench, a combustible liquid injecting mechanism and a polymorphic foam spraying mechanism. The combustible liquid injecting mechanism and the polymorphic foam spraying mechanism are relatively arranged on the test bench. The combustible liquid injecting mechanism can spray combustible liquid to the test bench. The polymorphic foam spraying mechanism can spray polymorphic foam to the test bench, and the spraying direction of the polymorphic foam is relative to the spraying direction of the combustible liquid. The present invention can be used for testing and observing cut-off and control effects of polymorphic foam on combustible liquid flowing fire.

Provided herein are cellulose acetate tow bands having less than 0.1 wt. % titanium dioxide, wherein the content of titanium dioxide is measured by ashing and/or by titanium particle count density. Also provided herein is a method of measuring the titanium dioxide content of cellulose acetate tow by ashing. Also provided herein is a method for measuring the color of cellulose acetate tow.

An analytical method makes use of an oxygen-containing source having a predetermined content of an isotope of oxygen .sup.zO, which is not the same as natural composition and distribution of oxygen isotopes, to detect and/or quantify oxygen in oxidizable compound(s). The analytical method allows detecting and/or quantification with relatively high precision and accuracy oxygen in oxidizable compound(s), even at low content. The method is easy to implement and can be used for in-line analysis.

An analytical method makes use of an oxygen-containing source having a predetermined content of an isotope of oxygen .sup.zO, which is not the same as natural composition and distribution of oxygen isotopes, to detect and/or quantify oxygen in oxidizable compound(s). The analytical method allows detecting and/or quantification with relatively high precision and accuracy oxygen in oxidizable compound(s), even at low content. The method is easy to implement and can be used for in-line analysis.

An abnormality of a state in a system between a combustion tube and a detector can be detected without increasing device cost. An instrument for elemental analysis includes a combustion tube (2) that has a sample injection port (3) with an open top and is for combusting a liquid sample in the inside, a sample injection mechanism (6) having a nozzle (10) and a slider (8), the nozzle (10) being for injecting a sample into the combustion tube, and the slider (8) being configured to slide between a first position and a second position above the combustion tube (2), the sample injection mechanism (6) being configured so that the sample injection port (3) of the combustion tube (2) is sealed in a state where the slider (8) is positioned at the first position, and the sample injection port (3) is unsealed and the nozzle (10) is positioned above the sample injection port (3) in a state where the slider (8) is positioned at the second position, a carrier gas supply flow path (26) communicating with the inside of the combustion tube (2) to supply carrier gas into the combustion tube (2), a pressure sensor (30) for detecting pressure in the carrier gas supply flow path (26), a detector (22) that detects a component in sample gas flowing out of the combustion tube (2), and an arithmetic part (44) configured to determine an abnormality degree of a state in a system between the combustion tube and the detector based on a change in pressure, which is detected by the pressure sensor (30), at the time when the slider (8) of the sample injection mechanism (6) slides from the first position to the second position.

An abnormality of a state in a system between a combustion tube and a detector can be detected without increasing device cost. An instrument for elemental analysis includes a combustion tube (2) that has a sample injection port (3) with an open top and is for combusting a liquid sample in the inside, a sample injection mechanism (6) having a nozzle (10) and a slider (8), the nozzle (10) being for injecting a sample into the combustion tube, and the slider (8) being configured to slide between a first position and a second position above the combustion tube (2), the sample injection mechanism (6) being configured so that the sample injection port (3) of the combustion tube (2) is sealed in a state where the slider (8) is positioned at the first position, and the sample injection port (3) is unsealed and the nozzle (10) is positioned above the sample injection port (3) in a state where the slider (8) is positioned at the second position, a carrier gas supply flow path (26) communicating with the inside of the combustion tube (2) to supply carrier gas into the combustion tube (2), a pressure sensor (30) for detecting pressure in the carrier gas supply flow path (26), a detector (22) that detects a component in sample gas flowing out of the combustion tube (2), and an arithmetic part (44) configured to determine an abnormality degree of a state in a system between the combustion tube and the detector based on a change in pressure, which is detected by the pressure sensor (30), at the time when the slider (8) of the sample injection mechanism (6) slides from the first position to the second position.

The invention relates to a method for the continuous characterization and quantification of C1-C120 hydrocarbons present in a single sample taken from a sedimentary basin, said method including pyrolysis under a non-oxidizing atmosphere of the sample, the entrainment of the gaseous pyrolysis effluents by means of an inert gas stream and then the analysis of said effluents in order to obtain their profiles as a function of the pyrolysis temperature, wherein said profiles are deconvolved into sub-areas corresponding to each class of isomer via a reference chart established for each of said classes and obtained using the empirical Antoine equation derived from the integration of the Clausius-Clapeyron physical law for an assumed constant enthalpy of vaporization;