Rapid nitrate detection reagent and detection method

A technology of detection reagents and detection methods, which is applied in the measurement of color/spectral properties, material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc., can solve the difference of test results, poor repeatability, etc. problem, to achieve the effect of good stability, guarantee consistency, and strong adaptability

Active Publication Date: 2019-06-07
GUANGDONG HUANKAI MICROBIAL SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing cadmium powder test method has the problem of poor repeatability. Multiple tests are performed on the same sample, and the test results may be doubled.

Method used

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  • Rapid nitrate detection reagent and detection method
  • Rapid nitrate detection reagent and detection method
  • Rapid nitrate detection reagent and detection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A quick detection reagent for nitrate, comprising reagent I and reagent II, wherein:

[0031] The reagent I is composed of the following components: tartaric acid: 75.70g, cadmium powder (particle size less than 38 μm): 3.30g, sulfonamide: 1.00g, PVP: 20.00g; fully mix the components in the reagent I, and then Packed on the powder automatic packaging machine, the specification is 0.30g / bag;

[0032] The reagent II is composed of the following components: naphthaleneethylenediamine hydrochloride: 2.00g, tartaric acid: 98.00g; the components in the reagent II are fully mixed and evenly packed, and then packed on a powder automatic packaging machine, the specification is 0.20g / bag .

Embodiment 2

[0034] A quick detection reagent for nitrate, comprising reagent I and reagent II, wherein:

[0035] The reagent I is composed of the following components: tartaric acid: 74.00g, cadmium powder (particle size less than 38 μm): 5.00g, sulfonamide: 1.00g, PVP: 20.00g; fully mix the components in the reagent I, and then Packed on the powder automatic packaging machine, the specification is 0.20g / bag;

[0036] The reagent II is composed of the following components: naphthaleneethylenediamine hydrochloride: 4.00g, tartaric acid: 96.00g; the components in the reagent II are fully mixed and evenly packed, and then packed on an automatic powder packaging machine, the specification is 0.10g / bag .

Embodiment 3

[0038] The production method of the standard color card is as follows:

[0039] 1) Use pure water to prepare nitrates with concentrations of 0.05mg / L, 0.1mg / L, 0.2mg / L, 0.3mg / L, 0.4mg / L, 0.5mg / L, 0.7mg / L, 1.0mg / L Nitrogen (as NO 3 -N meter) standard solution;

[0040] 2) Add the nitrate nitrogen standard solution with a concentration of 0.05mg / L into the clean colorimetric bottle to the 10mL mark, add 1 pack of reagent I prepared in Example 1, shake on the vortex for 3min, and let it stand for 2min. Then add 1 pack of the reagent II prepared in Example 1, shake it on a vortex meter for 5 minutes, let it stand for 10 minutes, then place the colorimetric bottle on a white PVC plate, observe the color of the solution from the mouth of the bottle, and test it in Pantone Find the corresponding standard color on the color card, and repeat the operation, respectively for the concentrations of 0.1mg / L, 0.2mg / L, 0.3mg / L, 0.4mg / L, 0.5mg / L, 0.7mg / L, 1.0 mg / L nitrate nitrogen standard ...

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Abstract

The invention discloses a rapid nitrate detection reagent and a detection method. The rapid nitrate detection reagent includes a reagent I and a reagent II. The reagent I is composed of the followingcomponents by mass: 58-88.5% of organic acid, 1-10% of cadmium powder, 0.5-2% of sulfonamide and 10-30% of polyvinyl pyrrolidone. The reagent II is composed of the following components by mass: 2-6% of N-(1-naphthyl) ethylenediamine dihydrochloride and 94-98% of organic acid. The on-site rapid nitrate detection method of the invention includes the following steps: (1) adding a water sample under test to a colorimetric bottle, and then, adding the rapid nitrate detection reagent of the invention for developing; and (2) comparing the color with a standard colorimetric card or drawing a standardcurve to obtain the nitrate content of the water sample under test. The rapid nitrate detection reagent of the invention has strong adaptability and good stability, and can be used together with a standard colorimetric card or a portable colorimeter to rapidly determine the content of nitrate in water and food samples on site.

Description

technical field [0001] The invention relates to a rapid detection reagent and detection method for nitrate. Background technique [0002] Nitrate and nitrite are the most common nitrogen-containing compounds in nature. The appearance and taste of nitrite are similar to table salt, so it can be used as a food additive, but excessive nitrite added to food will cause poisoning to the eater. Nitrate in the human body can be converted into nitrite under the action of microorganisms, so in order to determine whether the water quality and food are safe, not only the content of nitrite but also the content of nitrate needs to be measured. For example: White sugar is a commonly used food additive. The content of nitrite and nitrate in white sugar prepared from different raw materials is quite different. Generally, the content of nitrate in beet sugar is significantly higher than that in sucrose. Therefore, enterprises producing beet sugar need to control The content of nitrite in t...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N21/31
Inventor 秦惠邓金花林昆仑黄报亮
Owner GUANGDONG HUANKAI MICROBIAL SCI & TECH
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