Portable water nitrogen and oxygen isotope filtration and adsorption device and absorption method

Abstract

The invention discloses a portable water nitrogen and oxygen isotope filtration and adsorption device which comprises a water storage tank that is a cuboid, filtration and adsorption devices and a water pumping device, wherein the upper plane of the water storage tank is provided with big holes and a small hole; a valve is arranged at the bottom of the water storage tank; each filtration and adsorption device comprises a water sample bottle, a water guide pipe, a membrane filter, an adsorption column and a support frame; and the water pumping device comprises a water pump, a water inlet pipeline and a water outlet pipeline. The absorption method comprises the following steps: fully filling the water sample bottle with a water sample, starting the water pump, adjusting the water amount of the water inlet pipeline, and carrying out filtration and absorption processes on the water sample through the membrane filter and the absorption column. The portable water nitrogen and oxygen isotope filtration and adsorption device combines the filtering process and the absorbing process into one process, so that one-time container cleaning process is omitted; and a water sample can be filtered and absorbed onboard, so that the device is simple to operate, time-saving and labor-saving.

Description

technical field [0001] The invention relates to the field of nitrogen and oxygen isotope detection in water, and further relates to a portable nitrogen and oxygen isotope filtering and adsorption device in water and an adsorption method. Background technique [0002] Nitrate nitrogen and oxygen isotope compositions in water can effectively indicate the source and change of nitrate in water. Nitrate nitrogen and oxygen isotope methods have been widely used in various water body nitrogen pollution and watershed nitrogen cycle research. Extracting nitrate ions from water samples and then testing nitrogen and oxygen isotopic compositions is the premise of applying this method to research. At present, the commonly used test methods for the composition of nitrate nitrogen and oxygen isotopes in water samples mainly include anion and cation exchange resin adsorption method. In order to avoid transporting a large amount of water samples to the laboratory and carrying out special tr...

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Problems solved by technology

[0008] (1) There are many instruments that need to be carried for filtration and adsorption, the volume of the instruments is relatively large, and the space occupied is relatively large, so it is extremely inconvenient to carry in the field;

[0009] (2) The two processes of filtration and adsorption must be completed separately. First, the filtered water sample should be stored in a pure container, which adds a step of cleaning the container, and the operation is time-consuming and laborious.

[0010] (3) All water samples need to be transported back to the hotel for filtration and adsorption at night, which is time-consuming

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