A flow cell for on-line analysis of iodine-containing liquid loop water quality

Abstract

The invention belongs to the technical field of iodine analysis, and in particular relates to a flow cell for on-line analysis of the water quality of an iodine-containing liquid circuit, which is connected to the iodine-containing liquid circuit and comprises a sealed flow cell capable of introducing the iodine-containing liquid from the iodine-containing liquid circuit. A cell body (1), the flow cell body (1) is provided with a pH electrode (5), an iodine ion selective electrode (7) and a dissolved oxygen electrode (9) capable of measuring the iodine-containing liquid. The invention can realize the on-line measurement of the pH value, iodide ion concentration and dissolved oxygen content of the iodine-containing liquid in the iodine-containing liquid circuit, and the on-line monitoring of the water quality of the iodine-containing solution can directly monitor the conversion reaction of liquid-phase iodine. Greatly improved the efficiency of the test. The flow cell is made of polytetrafluoroethylene material, which avoids the test interference caused by the large amount of iodine adsorbed on the wall of the container, which is of great significance to the test with very low iodine content.

Description

technical field [0001] The invention belongs to the technical field of iodine analysis, and in particular relates to a flow cell for on-line analysis of iodine-containing liquid circuit water quality. Background technique [0002] Iodine is one of the fission products produced in the core of a light water reactor. Under the condition of the reactor accident, iodine is an important radiation source, and most of the form initially released from the fuel is ionic. Settled or directly settled into the pool of the core, but ionic iodine does not always exist in the water environment stably. Under certain environmental conditions, part of it can be further converted into elemental iodine, and then volatilized into the gaseous space of the containment. Shell defects or exhaust systems are released into the external environment, so iodine is considered to be of greatest concern to public health. [0003] The main factors affecting the conversion of ionic iodine to elemental iodine ...

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Problems solved by technology

[0004] Regarding the behavior of iodine under PWR accident conditions, although it is still in its infancy in China, a lot of research work has been carried out internationally. The change of iodine can intuitively reflect the conversion of iodine, which is important information that needs to be understood during the test. At present, an analysis unit is added to the liquid phase circuit for the analysis and measurement of the above information in the circuit. During the analysis process Part of the liquid needs to be taken out for analysis, not only cannot realize real-time online monitoring, but also the operation is cumbersome, and sometimes the analysis liquid is polluted by adding other analytical reagents during the analysis process, so it can no longer flow into the circulation loop. increase, the liquid in the circulation loop will continue to decrease, which will have a greater impact on the entire test; in addition, the analysis unit is prone to dead angles and is not easy to clean. After a long time of use, it will cause errors in the measured values.

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