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Reagent for fast colorimetric detection on nitrate radicals and nitrite radicals

A technology of nitrite and nitrate, which is applied to measurement devices, material analysis, instruments and other directions by observing the influence on chemical indicators, can solve the problems of low sensitivity, long reaction time, complex probe molecule synthesis, etc. Strong anti-interference, short reaction time, real-time colorimetric detection of nitrate and nitrite

Active Publication Date: 2018-11-23
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It overcomes the disadvantages of complex synthesis, low sensitivity, and long reaction time of the probe molecules used in the colorimetric detection of nitrate and nitrite in the prior art, and provides effective technical means for the detection of non-standard explosive raw materials

Method used

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  • Reagent for fast colorimetric detection on nitrate radicals and nitrite radicals
  • Reagent for fast colorimetric detection on nitrate radicals and nitrite radicals
  • Reagent for fast colorimetric detection on nitrate radicals and nitrite radicals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] At room temperature, weigh 0.1mg, 0.2mg, 0.4mg, 0.6mg, 0.8mg, 1mg, 2mg, 4mg, 6mg, 8mg, 10mg, 40mg, 70mg, 100mg and 400mg of N-benzoanilide respectively dissolved in In 10mL of perchloric acid with a concentration of 70%, stir evenly to obtain a reagent for rapid colorimetric detection of nitrate and nitrite;

[0037] Mix the prepared reagents of different concentrations with 1M KNO 3 Scanning pictures of the flat plate before and after the reaction are as follows: figure 1 shown by figure 1 It can be seen that: the reagent before the reaction gradually changes from colorless to deep yellow along with the increase of N-benzoanilide concentration, and the solution after the reaction gradually changes from light yellow to brownish yellow; in order to visually compare the reaction The change of the color before and after the reaction is shown in the third row of picture 1 by directly subtracting the color after the reaction from the color before the reaction. It can be se...

Embodiment 2

[0039] At room temperature, dilute 98% concentrated sulfuric acid with ultrapure water to 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90% and 95%, and then weigh 40mg of 3 -Amino-4-methoxyethoxy acetanilide was dissolved in 10mL of sulfuric acid of different concentrations and stirred evenly to obtain a reagent for rapid colorimetric detection of nitrate and nitrite;

[0040] Mix the prepared different sulfuric acid concentration reagents with 1M KNO 3 Scanning pictures of the flat plate before and after the reaction are as follows: image 3 As shown in (illustration), it can be seen that the reagent before the reaction gradually changes from colorless to light yellow with the increase of sulfuric acid concentration, and when the sulfuric acid concentration is 70%, the color reaches the darkest, and then gradually changes from colorless to light yellow with the increase of sulfuric acid concentration Pale yellow becomes colorless; And the solution after reaction gradually becomes...

Embodiment 3

[0042] At room temperature, dilute 57% hydriodic acid to 50% with ultrapure water, then weigh 1mg of 4,4'-diaminobenzanilide and dissolve it in 10mL of 50% hydriodic acid, stir evenly to obtain fast Reagents for colorimetric detection of nitrate and nitrite;

[0043] Mix the prepared detection reagent with 10mM, 9mM, 8mM, 7mM, 6mM, 5mM, 4mM, 3mM, 2mM, 1mM, 900μM, 800μM, 700μM, 600μM, 500μM, 400μM, 300μM, 200μM, 100μM, 90μM, 80μM, 70μM, 60 μM, 50 μM, 40 μM, 30 μM, 20 μM, 10 μM, 9 μM, 8 μM, 7 μM, 6 μM, 5 μM, 4 μM, 3 μM, 2 μM, 1 μM, 0.9 μM, 0.8 μM and 0 μM KNO 3 Ultrapure aqueous solution reaction, the color change before and after the reaction is obtained by scanning on a flat plate, such as Figure 4 shown by Figure 4 It can be seen that with KNO 3 As the concentration increases, the solution gradually changes from colorless to yellow, when KNO 3 The color change can be seen with the naked eye at a concentration of 10 μM; in order to compare the color change of the solutio...

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Abstract

The invention provides a reagent for fast colorimetric detection on nitrate radicals and nitrite radicals. The reagent is prepared from an aniline compound and strong acid; the detecting reagent showshigh selectivity on nitrate and nitrite, so that the reagent can be enabled to detect nitrate radicals and nitrite radicals in trace nonstandard explosives. After the reagent is in contact with the detect nitrate radicals and the nitrite radicals for 3s, the naked eye visual color change is reached; the complicated analysis equipment is not needed, so that the low-cost, instant and trace detection on the nitrate radicals and the nitrite radicals is realized. In addition, the reagent has the advantages that the preparation is easy; the operation is simple and convenient; the sensitivity is high; the cost is low; the defects of direct colorimetric detection incapability on the nitrate radicals, low sensitivity, long reaction time and the like in the prior art are overcome; the effective technical support is provided for trace detection on the nitrate radicals and the nitrite radicals in nonstandard explosives.

Description

technical field [0001] The invention belongs to the field of detection of non-standard explosives and provides a reagent for rapid colorimetric detection of nitrate and nitrite. Background technique [0002] Terrorist attacks have occurred frequently in the past 20 years, seriously threatening the lives and property of people all over the world (Analyticachimica acta, 2015, 893: 1-13; Nanoscale, 2016, 8: 1305–1308; Forensic science international, 2014, 242: 228- 235). Non-standard explosives have become the preferred method of terrorists due to their low price, easy availability of raw materials, and difficulty in detection (Talanta, 2016, 161: 219–227). Non-standard explosives are usually based on inorganic energetic oxidizers such as nitrates, chlorates or perchlorates (TrAC Trends in Analytical Chemistry, 2014, 56:27-36). And nitrate (ammonium nitrate, potassium nitrate, sodium nitrate etc.) is as the most commonly used agricultural fertilizer, and it can very easily pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
CPCG01N21/78G01N2021/775
Inventor 窦新存王广发蔡珍珍
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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