A pretreatment device for online determination of nitrate nitrogen isotope in liquid

Abstract

The invention relates to a pretreatment device for online determination of nitrate nitrogen isotope in liquid. The pretreatment device comprises a helium bypass pipe, a reagent bottle, a gas inlet needle, a gas outlet needle, a sample bottle, a reagent needle, a sampling needle, a heatable sample disc, a cold trap, a reducing furnace and four six-way valves, wherein the gas inlet needle and the gas outlet needle are arranged at the mouth of the reagent bottle; one end of the helium bypass pipe is connected with the gas inlet needle, and the other end of the helium bypass pipe is connected with the six-way valves; the gas outlet needle is also connected with the six-way valves; the sample bottle is arranged on the heatable sample disc, and a reagent needle and the sampling needle controlled by a full-automatic mechanical arm are arranged in the heatable sample disc; the reagent needle is connected with the six-way valves, and the sampling needle is connected with the six-way valves; and the cold trap and the reducing furnace are connected with the six-way valves. Compared with the prior art, the loss problem of samples in the offline treatment process can be overcome, no reagent and sample complicated substance pollutions are introduced, and the pretreatment efficiency of the samples can be improved by adopting intelligent operation.

Description

technical field [0001] The invention belongs to the technical field of isotope detection equipment, and in particular relates to a pretreatment device for on-line determination of nitrate nitrogen isotope in liquid. Background technique [0002] Groundwater is an irreplaceable important resource necessary for my country's economic and social development and people's life. In some cities and vast rural areas in China, groundwater is often the only source of water supply. In recent years, the pollution of groundwater by nitrate nitrogen has become a common concern in the world. Many areas in my country are also polluted by nitrate nitrogen to varying degrees, especially in rural areas, which are very common and tend to become more and more serious. In order to ensure the safety of water supply and effectively control the polluted groundwater body, it is very important to determine the source of nitrate nitrogen pollution in groundwater. δ15N can trace the biogeochemical cyc...

AI Technical Summary

Problems solved by technology

In summary, the pretreatment steps of liquid nitrate nitrogen isotope determination are cumbersome, the sample preparation process is long, the labor cost is high, and the sample is inevitably lost or polluted during the process, which makes the nitrate nitrogen isotope analysis technology widely used in water environment. Applications in the field are restricted

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