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

Abstract

The invention belongs to the technical field of iodine analysis, and particularly relates to a flow cell for water quality on-line analysis of an iodine-containing liquid loop, which is connected to the iodine-containing liquid loop and comprises a sealed flow cell main body (1) capable of introducing an iodine-containing liquid from the iodine-containing liquid loop, the flow cell main body (1) is provided with a PH electrode (5), an iodide ion selective electrode (7) and a dissolved oxygen electrode (9) which can be used for measuring the iodine-containing liquid. According to the invention, the online measurement of the pH value, iodide ion concentration and dissolved oxygen content of the iodine-containing liquid in the iodine-containing liquid loop can be realized, the online monitoring of the water quality of the iodine-containing liquid can be realized, the conversion reaction of liquid phase iodine can be directly monitored, and the test efficiency is greatly improved. The flow cell is made of a polytetrafluoroethylene material, so that test interference caused by the fact that the wall surface of a container adsorbs a large amount of iodine is avoided, and the flow cell is of great significance to tests with very low iodine content.

Description

technical field [0001] The invention belongs to the technical field of iodine analysis, in particular 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 light water reactors. Under reactor accident conditions, iodine is an important source of radiation. Most of its initial form released from the fuel is in the ionic state, and most of the ionic iodine passes through the wall surface. It settles or directly settles into the water pool of the core, but the ion iodine does not always exist stably in the water environment. Under certain environmental conditions, part of it can be further converted into elemental iodine, and then volatilizes into the gaseous space of the containment. Iodine is considered to be of greatest concern to public health due to shell defects or releases into the external environment by ventilation systems. [0003] The factors ...

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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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