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Filling method for cadmium column used for water nitrate determination

A nitrate and cadmium column technology, applied in measuring devices, chemical method analysis, instruments, etc., can solve problems such as easy leakage, difficult filling, oxidation, etc., and achieve the effect of simple operation

Active Publication Date: 2016-07-20
THIRD INST OF OCEANOGRAPHY STATE OCEANIC ADMINISTATION
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a simple, safe and effective small-volume cadmium column suitable for automatic nutrient analyzers in order to overcome the problems of easy leakage, oxidation and difficult filling in the filling process of the cadmium column in the prior art. Cadmium column packing method for the determination of nitrate in water quality

Method used

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  • Filling method for cadmium column used for water nitrate determination
  • Filling method for cadmium column used for water nitrate determination
  • Filling method for cadmium column used for water nitrate determination

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] The first step: if figure 1 As shown, remove the 10ml syringe plunger 1, put the syringe barrel 2 and the syringe needle 5 down, pour 5g of cadmium grains with a diameter of 2mm, and put the syringe plunger 1 back into the syringe barrel 2.

[0021] Step 2: Inhale 2mol / L hydrochloric acid solution and shake and wash, remove the oxide layer on the surface of cadmium particles, discard the acid solution, inhale ultrapure water and shake and wash until neutral; discard the acid solution and washing wastewater process, such as figure 2 As shown, the syringe needle 5 faces upwards, the syringe plunger 1 is pushed slowly, the liquid 6 is discharged, and the cadmium particles 3 are always in the liquid 6 .

[0022] Step 3: Inhale 10g / L copper sulfate solution, oscillate and soak for 3 minutes, discard the waste liquid, wash with ultrapure water until ...

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Abstract

The invention provides a filling method for a cadmium column used for water nitrate determination and relates to determination of nitrate in water.A syringe piston is dismantled, and a syringe is filled with cadmium particles; the syringe sucks in a hydrochloric acid solution to be washed, oxide layers on the surfaces of the cadmium particles are removed, the acid solution is removed, and the syringe sucks in ultrapure water to be washed to be neutral; the syringe sucks in a copper sulfate solution for shaking soaking, the waste solution is removed, ultrapure water is used for shaking washing till no colloidal copper is contained, and the syringe sucks in ultrapure water which seals the cadmium particles; glass fibers are stuffed into the bottom of a reduction column, a connector is installed, and the whole reduction column is immersed in a water container to be filled with water; a syringe needle is taken down, a syringe nipple and the upper portion of the reduction column are connected, the syringe nipple is immersed in water downwards, the head of the syringe is beaten, the syringe piston is pushed to make the cadmium particles enter the reduction column, glass fibers are stuffed into the upper portion of the reduction column, and the connector is installed; the cadmium column is activated according to the method in GB17378.4-2007, the reduction rate of the cadmium column is determined, and then filling of the cadmium column is completed.

Description

technical field [0001] The invention relates to the determination of nitrate in water quality, in particular to a cadmium column filling method for determination of nitrate in water quality. Background technique [0002] There are many methods for the determination of nitrate in water quality. Among them, the cadmium column reduction method (GB / T5750.5-2006) is one of the methods widely used at present. This method has a high absolute reduction rate (>95%) and stable salt effect. , good reproducibility, etc., suitable for nutrient flow injection analyzers, etc. Since Wood and Armstrong proposed the copper-cadmium reduction method for the determination of nitrate in seawater in 1967, after continuous improvement and improvement, the cadmium reduction method has become the main method for the determination of nitrate in seawater in the world. [0003] However, the filling of the cadmium column has certain technical requirements and higher requirements for operators; the fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/00
CPCG01N31/00
Inventor 陈顺洋陈光程陈彬
Owner THIRD INST OF OCEANOGRAPHY STATE OCEANIC ADMINISTATION
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