A method for measuring carbon-14 in environmental water

Abstract

The invention discloses a method for measuring carbon-14 in environmental water. The method comprises the steps of inorganic carbon gas freeing sample preparation, organic carbon sample preparation and liquid flash measurement, wherein the organic carbon sample preparation comprises wet organic carbon oxidization, high-temperature catalytic oxidization, carbon dioxide catching and conversion; the method is characterized in that during the wet organic carbon oxidization, a multi-element catalytic oxidizing agent system is adopted to perform catalytic oxidization; the multi-element catalytic oxidizing agent system consists of S2O8<2-> / H2O2 and Fe<2+> / TiO2; during high-temperature catalytic oxidization, a tubular furnace is adopted to perform catalytic oxidization. Due to collection step by step through different gas paths, the activity concentration of inorganic carbon-14, the activity concentration of organic carbon-14 and the activity concentration of total carbon-14 in the environmental water body can be respectively measured; by the use of the multi-element catalytic oxidizing agent system, the carbon-14 of various organic forms in a sample can be efficiently and stably converted and caught; high-capacity sample treatment capacity is realized, and a low-enough detection lower limit level is achieved.

Description

technical field [0001] The invention relates to a detection method of an environmental water body, in particular to a method for measuring the carbon-14 content in the environmental water body. Background technique [0002] Carbon-14 is one of the most important nuclides released into the environment by nuclear power plants, and is released to the environment through gaseous effluents and liquid radioactive effluents. Carbon-14 released into the environment is very easy to participate in the carbon cycle and enter the living body, and may eventually be absorbed by the human body, causing radiation effects on the human body. The half-life of carbon-14 is very long, reaching 5730 years, and the maximum energy of beta rays released during its decay is 156keV. Due to its high mobility in the environment and its long half-life, carbon-14 is considered to be one of the most important nuclides that cause radiation dose burden to the human body (the content of carbon-14 in the huma...

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Problems solved by technology

Another method that can be considered is to use ultraviolet irradiation / persulfate oxidation of the sample. This method needs to provide ultraviolet light irradiation, and the equipment is complicated. At the same time, the equipment of this measurement method can usually only be used for the measurement of a small amount of samples (milliliter level ), due to the low carbon-14 content in the environmental water body, in order to improve the accuracy of the measurement, it is necessary to use a large-capacity sample method for measurement. The sample volume is between several liters and tens of liters. The existing technology cannot complete the above measurement

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