Test paper for rapidly testing nitrite and standard colourimetric card and application of test paper

A standard colorimetric card and nitrite technology, which is applied in the field of test paper for rapid detection of nitrite and its standard colorimetric card, can solve the problems of affecting accuracy, easy decomposition, etc., and achieves improved accuracy, good water solubility, The effect of reducing efficacy

Inactive Publication Date: 2015-04-22
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used drying methods are vacuum drying method and blast drying method, and the drying ambient temperature is higher than 50°C, but the p-aminobenzenesulfonic acid in the color developer component is easy to decompose when heated, which seriously affects the accuracy of detection

Method used

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  • Test paper for rapidly testing nitrite and standard colourimetric card and application of test paper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A preparation method of a test paper for rapid detection of nitrite, comprising the steps of:

[0049] (1) Preparation of 4g / L p-aminobenzenesulfonic acid solution: measure 50.4mL concentrated hydrochloric acid and dilute to 100mL to obtain a 20% hydrochloric acid solution by volume; 20% hydrochloric acid solution, put it in a brown bottle and mix evenly to obtain a 4g / L p-aminobenzenesulfonic acid solution, and store it away from light;

[0050](2) Preparation of 2g / L N-1-naphthaleneethylenediamine hydrochloride solution: Weigh 0.2g N-1-naphthaleneethylenediamine hydrochloride powder and dissolve it in 100mL distilled water, put it in a brown bottle and mix evenly. Promptly obtain the N-1-naphthaleneethylenediamine hydrochloride solution that concentration is 2g / L, keep away from light and low temperature;

[0051] (3) Preparation of nitrite chromogen: Measure 20 mL of 4 g / L p-aminobenzenesulfonic acid solution and 30 mL of 2 g / L N-1-naphthalene ethylenediamine hydroc...

Embodiment 2

[0060] A preparation method of a test paper for rapid detection of nitrite, comprising the steps of:

[0061] (1) Preparation of 4g / L p-aminobenzenesulfonic acid solution: measure 50.4mL concentrated hydrochloric acid and dilute to 100mL to obtain a 20% hydrochloric acid solution by volume; 20% hydrochloric acid solution, put it in a brown bottle and mix evenly to obtain a 4g / L p-aminobenzenesulfonic acid solution, and store it away from light;

[0062] (2) Preparation of 2g / L N-1-naphthaleneethylenediamine hydrochloride solution: Weigh 0.2g N-1-naphthaleneethylenediamine hydrochloride powder and dissolve it in 100mL distilled water, put it in a brown bottle and mix evenly. Promptly obtain the N-1-naphthaleneethylenediamine hydrochloride solution that concentration is 2g / L, keep away from light and low temperature;

[0063] (3) Preparation of nitrite chromogenic agent: Measure 20mL of 4g / L p-aminobenzenesulfonic acid solution and 20mL of 2g / L N-1-naphthaleneethylenediamine hy...

Embodiment 3

[0072] A preparation method of a test paper for rapid detection of nitrite, comprising the steps of:

[0073] (1) Preparation of 4g / L p-aminobenzenesulfonic acid solution: measure 50.4mL concentrated hydrochloric acid and dilute to 100mL to obtain a 20% hydrochloric acid solution by volume; 20% hydrochloric acid solution, put it in a brown bottle and mix evenly to obtain a 4g / L p-aminobenzenesulfonic acid solution, and store it away from light;

[0074] (2) Preparation of 2g / L N-1-naphthaleneethylenediamine hydrochloride solution: Weigh 0.2g N-1-naphthaleneethylenediamine hydrochloride powder and dissolve it in 100mL distilled water, put it in a brown bottle and mix evenly. That is, the N-1-naphthaleneethylenediamine hydrochloride solution with a concentration of 2 g / L was obtained, which was stored in the dark and at low temperature.

[0075] (3) Preparation of nitrite color reagent: Measure 22.5mL of 4g / L p-aminobenzenesulfonic acid solution and 27.5mL of 2g / L N-1-naphthale...

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Abstract

The invention belongs to the field of chemical detection and particularly relates to test paper for rapidly detecting nitrite and a preparation method and application of the test paper. According preparation method, the test paper for rapidly detecting the nitrite is prepared by taking a filter paper body as a carrier, a p-aminobenzene sulfonic acid solution and an N-1-naphthyl ethylenediamine hydrochloride as color developing agents, as well as an ethanol water solution of polyvinyl alcohol as a surface protectant and can be used for detecting the content of the nitrite. The test paper is low in cost, convenient and rapid to use and has long-term stability.

Description

technical field [0001] The invention belongs to the field of chemical detection, and in particular relates to a test paper for rapid detection of nitrite, a standard color comparison card and its application. Background technique [0002] Nitrite is an inorganic salt that is very soluble in water. It is toxic and highly pathogenic. Long-term intake can cause cancer. Nitrite is often used as a color-protecting agent and preservative in food; a large amount of pollution such as chemical fertilizers, fuel combustion, and human and animal waste causes widespread nitrite in the air, soil, water, and plants. Nitrates can contaminate food through milk-producing animals and water. Because the appearance of nitrite is very similar to table salt, it is sometimes mistaken for table salt and added to food, thus causing food poisoning. In addition, nitrite is also produced during the production of pickled foods such as pickles and when leftovers are stored. However, the current labora...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/22G01N21/78
Inventor 李德红罗振华高婧娟柯芳张燕丹
Owner SOUTH CHINA NORMAL UNIVERSITY
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