JPH059654Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an analysis device for analyzing the components of a sample containing salts such as seawater after being subjected to combustion treatment.

For example, in the case of a TOC meter, it is said that if there are a lot of salts such as NaCl, the molten salts will precipitate at the outlet of the combustion furnace and clog it, making it impossible to measure samples with too much salt. No measurements were taken. Therefore, up until now, there have been no problems due to salt clogging as described above, but recently, the measurement of industrial wastewater, etc. has become more important, and as a result, it has become necessary to measure samples containing a large amount of salts. , salt clogging has become a problem.

However, regarding this problem, precipitation of salts is
Since salts mainly occur at the outlet of the combustion furnace, it has been confirmed that providing a means for removing salts at the outlet can be sufficient to deal with the problem. In other words, while allowing salts to precipitate at the outlet, it is necessary to prevent clogging.
By providing a salt removal section with a large diameter,
The above-mentioned problem could be solved.

However, even if the salts are removed by the salt removal section configured in this way, a new problem arises in that the analyzer drifts and becomes unusable.

Regarding this new problem, various experiments were conducted and it was found that the higher the concentration of salts in the aqueous sample, the greater the drift of the analyzer. This is because when the concentration of salts is high, some of the chlorine ions (Cl) in the salts are oxidized to chlorine gas (Cl ₂ ) in a high-temperature oxidizing atmosphere, and this chlorine gas is analyzed. This is thought to be due to the decay of the cells in the meter.

The present invention was developed in view of the above circumstances, and the aqueous sample and carrier gas are injected into a combustion furnace and combusted, and the gas is discharged through a salt removal section and then introduced into an analyzer for analysis. The purpose of the present invention is to provide an aqueous sample analyzer capable of accurately and stably analyzing even aqueous samples containing a large amount of salts.

In the present invention, means for achieving such an object are configured as follows.

That is, for an aqueous sample analyzer in which an aqueous sample and a carrier gas are injected into a combustion furnace and burned, the gas is discharged through a salt removal section, and then introduced into an analyzer for analysis. A chlorine removal column via a dehumidifier is provided between the salt removal section and the analyzer.

According to this configuration, chlorine gas (Cl ₂ ) generated by oxidation of chlorine ions (Cl) in the gas discharged from the salt removal section can be removed by the chlorine removal column via the dehumidifier. As a result, the gas introduced into the analyzer does not contain chlorine gas, eliminating problems that occur in the past, such as cells being corroded by chlorine gas and causing drift. The Rukoto.

An embodiment of the present invention will be described below based on the drawings.

The drawing shows an aqueous sample and a carrier gas in combustion furnace 1.
This figure shows a TOC meter, which is an aqueous sample analyzer, in which the gas is injected into a combustion furnace and combusted, and the gas coming out of the combustion furnace is analyzed by an analyzer, for example, an infrared analyzer 2.
In the figure, 3 is an aqueous sample injector, 4 is a carrier gas generator that generates a carrier gas for transporting the aqueous sample, 5 is a flow rate regulator, 6 is a flow meter, and 7
is a heater for heating the combustion furnace.

Reference numeral 8 denotes a salt removal section provided in the gas outlet passage on the exit side of the combustion furnace 1, which removes salts that have been in a molten state in the combustion furnace at the exit of the combustion furnace 1, as in the conventional case. Precipitation and clogging can be prevented. Although not shown in the drawings, this salt removal section 8 is constructed by increasing the diameter of the exit portion of the gas outlet passage where the salts in the combustion furnace 1 reach a temperature near the freezing point, and the salts solidify and precipitate in that portion. It is also constructed in such a way that it will not easily clog its outlet. With this configuration, even an aqueous sample containing a lot of salts can be subjected to combustion treatment for a long period of time, and continuous component measurement becomes possible.

9 is a dehumidifier for removing moisture contained in the gas that has passed through the salt removal section 8;
A chlorine removal column 10 is provided downstream of the dehumidifier 9. This chlorine removal column 10
For example, a column-shaped container is filled with crystalline or liquid sodium thiosulfate (Na ₂ S ₂ O ₃ ).

According to the aqueous sample analyzer configured as described above, salts are first removed from the gas coming out of the combustion furnace 1 in the salt removing section 8, but the salt removing section 8 is formed with a large diameter. Therefore, even if salts solidify and precipitate, they will not easily become clogged. Next, the gas from which salts have been removed has moisture removed by a dehumidifier 9, chlorine gas is removed by a chlorine removal column 10, and the gas is introduced into the analyzer 2. Therefore, since the analyzer 2 is not attacked by chlorine gas, the conventional troubles such as cell corrosion and drift are avoided, and accurate and stable analytical measurements can be performed.

In addition, in the case of Chemilumi type total nitrogen meters and TOD meters, there is a similar problem in that the zirconia detector is corroded by chlorine gas, but by applying the present invention as in this example, Such problems can be solved. However, TOD
In the case of a chlorine removal column, a converter that reduces NO ₂ to NO must be installed between the chlorine removal column and the analyzer.

As explained above, the present invention is an aqueous sample analysis method in which an aqueous sample and a carrier gas are injected into a combustion furnace and burned, and the gas is discharged from a salt removal section and then introduced into an analyzer for analysis. In the apparatus, a chlorine removal column is provided between the salt removal section and the analyzer via a dehumidifier, so that the analyzer is not attacked by chlorine gas.
The occurrence of conventional troubles such as drift in the analyzer is avoided. Therefore, even aqueous samples containing a large amount of salts, such as factory wastewater, can be analyzed continuously, stably, and accurately for a long period of time.

[Brief explanation of the drawing]

The drawing is an overall configuration diagram showing an embodiment of the present invention. 1... Combustion furnace, 2... Analyzer, 8... Salt removal section, 10... Chlorine removal column.

Claims (1)

[Scope of utility model registration request] An aqueous sample analyzer in which an aqueous sample and a carrier gas are injected into a combustion furnace and burned, and the gas is discharged through a salt removal section and then introduced into an analyzer for analysis. An aqueous sample analyzer characterized in that a chlorine removal column is provided between the analyzer and the analyzer via a dehumidifier.