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Stability augmentation test paper for determining ammonia in air by drying method and preparation and detection method thereof

An air and test paper technology, used in measuring devices, material analysis, instruments and other directions by observing the effect on chemical indicators, can solve the problems of uneven density and uniformity of fillers, troublesome production process, measurement errors, etc., to reduce pH. The effect of color change range, improved sensitivity, and simple measurement method

Inactive Publication Date: 2019-02-19
SHENYANG LIGONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the production process, there are differences in the density and uniformity of the filler, which causes measurement errors, and the production process is cumbersome.

Method used

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  • Stability augmentation test paper for determining ammonia in air by drying method and preparation and detection method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] A kind of stable test paper for the determination of ammonia in the air by dry method, which is a test paper loaded with bromocresol purple-bromothymol blue mixed indicator and tetradecyldimethylbenzyl ammonium chloride (Zeph) on the chromatographic filter paper ; According to mass ratio, bromocresol purple: bromothymol blue: tetradecyldimethylbenzyl ammonium chloride (Zeph) = 0.2: 0.05: 0.002.

[0062] A preparation method of a dry test paper for measuring ammonia in air, comprising the following steps:

[0063] Step 1: Prepare the Soaking Solution

[0064] Bromocresol violet is dissolved in ethanol to obtain bromocresol violet ethanol solution;

[0065] Bromothymol blue is dissolved in ethanol to obtain bromothymol blue ethanol solution;

[0066] After mixing the bromocresol purple ethanol solution and the bromothymol blue ethanol solution evenly, then add an aqueous solution of tetradecyldimethylbenzyl ammonium chloride (Zeph), dilute to volume with ethanol, and mi...

Embodiment 2

[0081] A kind of stability test paper of ammonia in air is measured by dry method, is the test paper that is loaded with bromocresol purple-bromothymol blue mixed indicator and cetylpyridinium bromide (CPB) on the chromatographic filter paper; , bromocresol purple: bromothymol blue: cetylpyridinium bromide (CPB) = 0.55: 0.15: 0.01.

[0082] A preparation method of a dry test paper for measuring ammonia in air, comprising the following steps:

[0083] Step 1: Prepare the Soaking Solution

[0084] Bromocresol violet is dissolved in ethanol to obtain bromocresol violet ethanol solution;

[0085] Bromothymol blue is dissolved in ethanol to obtain bromothymol blue ethanol solution;

[0086] After mixing the bromocresol purple ethanol solution and bromothymol blue ethanol solution evenly, then add cetylpyridinium bromide (CPB) aqueous solution with a concentration of 0.1 / L, dilute to volume with ethanol, and mix evenly to obtain soaked liquid;

[0087] Among them, in every liter...

Embodiment 3

[0102] A kind of stability test paper of ammonia in air measured by dry method, with embodiment 1, difference is that cationic surfactant is the trimethyl ammonium salt of long chain alkyl, and long chain is C 12 -C 18 The alkyltrimethylammonium bromide, present embodiment is CTMAB, and its content per liter is 0.004-0.006g.

[0103] A preparation method of a dry test paper for measuring ammonia in the air, the same as Example 1, the difference is that the cationic surfactant is CTMAB.

[0104]A kind of detection method of the stability test paper of ammonia in the air measured by dry method: same as embodiment 1, the difference is that ammonia measuring scale is made according to the linear regression equation. The linear regression equation of the obtained discoloration zone length and the ammonia concentration in the air is: Y=0.592x+0.11, where x is the ammonia concentration in mg / m 3 Y is the color-changing band length of color-changing test paper, and the unit is mm; C...

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Abstract

The invention relates to stability augmentation test paper for determining ammonia in air by a drying method and preparation and detection methods thereof, and belongs to the fields of environmental monitoring technology and industrial hygiene. The stability augmentation test paper for determining ammonia in the air by the drying method is the test paper loaded with a bromocresol purple-bromothymol blue mixed indicator and a cationic surfactant on base paper, which has a mass ratio of bromocresol purple: bromothymol blue: cationic surfactant = (0.1-0.55): (0.025-0.2): (X-X'). An X-X' value varies depending on the surfactant. The preparation method comprises the following steps of: preparing a soaking liquid according to a reagent ratio; soaking the base paper; and drying and carrying out plastic packaging. The detection method comprises the following steps of: detecting the reaction of ammonia in the air and a mixed reagent of the test paper; turning from yellow to bluish violet; and obtaining the concentration of the ammonia in the air of a detection area according to the relationship between the length of a color changing belt of the test paper and the ammonia concentration. Thedetection method can be used to measure the ammonia concentration in the air of a workshop or a production site or the emergency monitoring of the ammonia leakage.

Description

technical field [0001] The invention belongs to the technical field of environmental monitoring and industrial sanitation, and in particular relates to a stability test paper for dry method determination of ammonia in the air and a preparation and detection method thereof. Background technique [0002] Ammonia is a colorless, volatile gas with a strong pungent odor and a specific gravity smaller than that of air. Ammonia is an alkaline substance that corrodes and irritates the skin tissue it touches; excessive inhalation of ammonia by the human body can cause respiratory system diseases. Ammonia pollution refers to the pollution to the environment when ammonia is produced and utilized during human activities. In order to timely and accurately measure the change of ammonia content in the atmosphere, fast and effective monitoring technology is very necessary. [0003] At present, the commonly used method for measuring ammonia in the air is the wet method. Firstly, the gas sa...

Claims

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Application Information

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IPC IPC(8): G01N21/78
CPCG01N21/783G01N2021/7759
Inventor 余萍高俊杰王秋艳刘施羽
Owner SHENYANG LIGONG UNIV
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