A rapid on-site detection method for nitrite in water that can eliminate the influence of reagent blank

A technology of nitrite and detection method, which is applied in the direction of material analysis by observing the influence on chemical indicators, and analysis by chemical reaction of materials, etc., can solve the adverse effect of the accuracy of detection results, and cannot eliminate reagent blank fluctuations. , the dissolution time is difficult to effectively control and other problems, to achieve the effect of high accuracy, easy operation and simple method

Active Publication Date: 2018-02-06
WENZHOU MEDICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the embodiments of the present invention is to provide a rapid on-site detection method for nitrite in water that can eliminate the influence of reagent blanks, so as to achieve rapid and accurate on-site determination of nitrite in water, and overcome the problem of dissolution due to the use of dry powder detection reagents in the prior art. Due to the difference in time, it is difficult to effectively control the detection time. Because the standard color card that does not deduct the reagent blank is used, the standard color card is directly compared with the sample tube to obtain the result during color comparison, and the fluctuation of the reagent blank cannot be eliminated. The impact on the accuracy of the test results Disadvantages of Adverse Effects

Method used

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  • A rapid on-site detection method for nitrite in water that can eliminate the influence of reagent blank
  • A rapid on-site detection method for nitrite in water that can eliminate the influence of reagent blank

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Step 1. Weigh 2g of p-aminobenzenesulfonic acid and 0.2g of naphthaleneethylenediamine hydrochloride, add 800ml of 80mmol / L pH5.0 acetic acid-sodium acetate buffer and stir to dissolve, then add 0.1ml of emulsifier OP-10, 10ml of ethylenediamine Alcohol, after stirring and dissolving, dilute to 1000ml with 80mmol / L pH5.0 acetic acid-sodium acetate buffer solution to obtain 1000ml containing 2g / L p-aminobenzenesulfonic acid, 0.2g / L naphthaleneethylenediamine hydrochloride, 0.1ml / L emulsified Agent OP-10, 80mmol / L pH5.0 acetic acid-sodium acetate buffer solution of 10ml / L ethylene glycol is a liquid nitrite detection reagent;

[0040] Step 2: Take seven 10ml glass colorimetric tubes, set the first colorimetric tube as a blank tube, and the second to seventh colorimetric tubes as standard tubes, add 10ml deionized water and 10ml into the blank tube and standard tube respectively Nitrite standard solution with a concentration of 0.05mg / L, 0.10mg / L, 0.20mg / L, 0.30mg / L, 0.40m...

Embodiment 2

[0046] Step 1. Weigh 3.5g of p-aminobenzenesulfonic acid and 0.35g of naphthaleneethylenediamine hydrochloride, add 800ml of 80mmol / L pH5.0 acetic acid-sodium acetate buffer and stir to dissolve, then add 0.2ml of emulsifier OP-10, 15ml of ethyl acetate Diol, after stirring and dissolving, settle to 1000ml with 80mmol / L pH5.0 acetic acid-sodium acetate buffer solution, obtain 1000ml containing 3.5g / L p-aminobenzenesulfonic acid, 0.35g / L naphthaleneethylenediamine hydrochloride, 0.2ml / L emulsifier OP-10, 80mmol / L pH5.0 acetic acid-sodium acetate buffer solution of 15ml / L ethylene glycol is a liquid nitrite detection reagent;

[0047] Step 2: Take seven 10ml glass colorimetric tubes, set the first colorimetric tube as a blank tube, and the second to seventh colorimetric tubes as standard tubes, add 10ml deionized water and 10ml into the blank tube and standard tube respectively Nitrite standard solution with a concentration of 0.05mg / L, 0.10mg / L, 0.20mg / L, 0.30mg / L, 0.40mg / L, 0...

Embodiment 3

[0053] Step 1. Weigh 5g of p-aminobenzenesulfonic acid and 0.5g of naphthaleneethylenediamine hydrochloride, add 800ml of 80mmol / L pH5.0 acetic acid-sodium acetate buffer and stir to dissolve, then add 0.3ml of emulsifier OP-10, 20ml of ethylenediamine Alcohol, after stirring and dissolving, dilute to 1000ml with 80mmol / L pH5.0 acetic acid-sodium acetate buffer solution to obtain 1000ml containing 5g / L p-aminobenzenesulfonic acid, 0.5g / L naphthaleneethylenediamine hydrochloride, 0.3ml / L emulsified Agent OP-10, 80mmol / L pH5.0 acetic acid-sodium acetate buffer solution of 20ml / L ethylene glycol is a liquid nitrite detection reagent;

[0054] Step 2: Take seven 10ml glass colorimetric tubes, set the first colorimetric tube as a blank tube, and the second to seventh colorimetric tubes as standard tubes, add 10ml deionized water and 10ml into the blank tube and standard tube respectively Nitrite standard solution with a concentration of 0.05mg / L, 0.10mg / L, 0.20mg / L, 0.30mg / L, 0.40m...

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Abstract

The invention discloses an on-site rapid detection method of nitrite in water which can eliminate the influence of reagent blank. The method adopts the preparation of liquid-type nitrite detection reagent, deducts the blank color of the reagent, and uses a transparent plastic plate as a standard color card as a supporting material. When making and testing the blank tube, superimpose the color of the blank tube on the standard color card and then compare it with the sample tube. The method is simple, accurate, and easy to operate. The liquid nitrite detection reagent is used for detection, which can effectively control the time required for the entire detection process; the color of the blank tube is superimposed on the standard color card and then compared with the sample tube for color comparison. The method can effectively eliminate the adverse effect of the fluctuation of the reagent blank on the accuracy of the detection result, and is especially suitable for the rapid detection of nitrite in water.

Description

technical field [0001] The invention belongs to the field of water quality detection, and in particular relates to a rapid on-site detection method for nitrite in water which can eliminate the influence of reagent blanks. Background technique [0002] Nitrite exists widely in nature, especially in gaseous water, surface water and groundwater, as well as in animals, plants and food. Nitrite has now been recognized as a major pollutant index in our daily drinking water, which reflects the degree of nitrogen-containing organic matter pollution in water to a certain extent. Once this substance enters the human body, it will cause methemoglobinemia, common symptoms of tissue hypoxia, and can also combine with secondary amines to form carcinogens, seriously affecting and threatening human health. Based on the widespread danger of nitrite, the national health standard has clearly stipulated that NO in drinking water 2 - ≤1.0mg / L. Long-term intake of drinking water with high con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/78
Inventor 连国军
Owner WENZHOU MEDICAL UNIV
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