Pretreatment device for water nitrate nitrogen isotope test

Abstract

The invention discloses a pre-treatment apparatus for test of a nitrate nitrogen isotope in water body. The pre-treatment apparatus comprises at least one pre-treatment pipeline. The pre-treatment pipeline comprises a water-supply pump, a water inlet and storage tank, a peristaltic pump, a resin exchange adsorption column and a water drainage and storage barrel which are communicated with one another successively, wherein the water inlet and storage tank is provided with an on-line test probe for nitrate nitrogen in inlet water; the water drainage and storage barrel is provided with an on-line test probe for nitrate nitrogen in drainage water; and the on-line test probe for nitrate nitrogen in the inlet water and the on-line test probe for nitrate nitrogen in the drainage water are connected with a data acquisition and control system. The pre-treatment apparatus provided by the invention is suitable for pretreatment (adsorption process) for the test of the nitrate nitrogen isotope in various water bodies. Compared with a conventional indoor pretreatment method, a pretreatment method employing the pre-treatment apparatus provided by the invention can overcome the problems of low treatment efficiency and complex applications in a normal pretreatment method for the test of the nitrate nitrogen isotope in the water body, realizes intellectualized operations, and greatly increases pretreatment efficiency.

Description

technical field

[0001] The invention relates to a water body nitrate nitrogen isotope test pretreatment device, which belongs to the field of water environment. Background technique

[0002] The problem of nitrogen pollution in water has attracted increasing attention. The isotope composition of nitrogen and oxygen in nitrate in water samples can effectively indicate the source and change of nitrate in water. It is increasingly used in source investigation and research. When testing nitrogen isotopes in water, the key is the pretreatment of water samples, which requires extraction of nitrate ions from water. At present, the most widely used method at home and abroad is the anion-cation exchange resin adsorption method. The migration process (adsorption) in this method can be carried out in the field or in the laboratory. When performing water sample pretreatment, it is necessary to know the concentration of nitrate in the water body in advance to determine the required wat...

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