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Sensitive test paper for measuring ammonia in air as well as preparation and determination methods thereof

A measurement method and technology of test paper, applied to measuring devices, material analysis by observing the influence of chemical indicators, instruments, etc., can solve problems such as process troubles, reading errors, and different lengths of reaction discoloration, so as to achieve convenient operation and avoid The effect of measurement error and ammonia content is higher

Active Publication Date: 2018-09-14
BEIJING CONGSHI HEDE ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its production involves the preparation of the filler carrier and the uniformity of the filler, so there are reading errors; due to the different production batches of glass tubes or the inhomogeneity of the inner diameter during the production process, the length of the gas detection tube with the same amount of filler is different. It directly leads to different lengths of reaction discoloration, so it is often necessary to calibrate it, and this process is cumbersome

Method used

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  • Sensitive test paper for measuring ammonia in air as well as preparation and determination methods thereof
  • Sensitive test paper for measuring ammonia in air as well as preparation and determination methods thereof

Examples

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Effect test

Embodiment 1

[0048]A sensitive test paper for measuring ammonia in the air, its structure diagram is shown in figure 1 , specifically test paper loaded with bromophenol blue and dodecyltrimethylammonium bromide; wherein, by mass ratio, bromophenol blue (g): cationic surfactant (mg) = 0.25: 0.3.

[0049] Described test paper is that length is 90mm, and width is the chromatographic filter paper of 3mm;

[0050] A preparation method of a sensitive test paper for measuring ammonia in the air, comprising the following steps:

[0051] Step 1, prepare soaking solution

[0052] Weigh the raw materials according to the proportion, add 0.1g of dodecyltrimethylammonium bromide into 100mL water to prepare dodecyltrimethylammonium bromide aqueous solution, and prepare bromophenol blue ethanol solution with 0.25g of bromophenol blue , then add 0.3mL dodecyltrimethylammonium bromide aqueous solution, mix evenly, add ethanol to make the volume to 100mL, and obtain the soaking solution;

[0053] Step 2,...

Embodiment 2

[0070] A sensitive test paper for measuring ammonia in the air is a test paper loaded with bromophenol blue and cetyltrimethylammonium bromide; wherein, by mass ratio, bromophenol blue (g): cationic surfactant (mg) =0.06:0.2.

[0071] Described test paper is that length is 90mm, and width is the chromatographic filter paper of 3mm;

[0072] A preparation method of a sensitive test paper for measuring ammonia in the air, comprising the following steps:

[0073] Step 1, prepare soaking solution

[0074] Weigh the raw materials according to the proportion, add 0.1g cetyltrimethylammonium bromide into 100mL water to make cetyltrimethylammonium bromide aqueous solution, and make 0.06g bromophenol blue to make bromophenol blue ethanol solution , then add 0.2mL cetyltrimethylammonium bromide aqueous solution, mix well, add ethanol to make the volume to 100mL, and obtain the soaking solution;

[0075] Step 2, Dipping

[0076] Immersing the chromatographic filter paper in the soaki...

Embodiment 3

[0084] A sensitive test paper for measuring ammonia in the air is a test paper loaded with bromophenol blue and cetyltrimethylammonium bromide; wherein, by mass ratio, bromophenol blue (g): cationic surfactant (mg) =0.4:0.5.

[0085] Described test paper is that length is 90mm, and width is the chromatographic filter paper of 3mm;

[0086] A preparation method of a sensitive test paper for measuring ammonia in the air, comprising the following steps:

[0087] Step 1, prepare soaking solution

[0088] Weigh the raw materials according to the proportion, add 0.1g cetyltrimethylammonium bromide into 100mL water to make cetyltrimethylammonium bromide aqueous solution, and make 0.4g bromophenol blue to make bromophenol blue ethanol solution , then add 0.5mL cetyltrimethylammonium bromide aqueous solution, mix evenly, add ethanol to make the volume to 100mL, and obtain the soaking solution;

[0089] Step 2, Dipping

[0090] Cut the chromatographic filter paper into test paper st...

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Abstract

The invention discloses sensitive test paper for measuring ammonia in air as well as preparation and determination methods thereof, belonging to the field of environmental monitoring. The sensitive test paper is loaded with bromophenol blue and a cationic surfactant, and the mass ratio of bromophenol blue (g) to the cationic surfactant (mg) is equal to (0.06-0.4):(0.1-0.5). The preparation methodcomprises the following steps: immersing filter paper or chromatographic filter paper in soaking liquid to obtain immersed test paper, then drying, and sealing with plastic at 110-150 DEG C, so as toobtain the sensitive test paper for measuring ammonia in air. One end of the sensitive test paper is cut open, so that ammonia in air diffuses into the test paper and reacts with the bromophenol blueand the cationic surfactant supported on the test paper to form a blue complex, and the rising height of the blue complex is measured to obtain the content of ammonia in air. The test paper has the advantages of accurate, fast, intuitive and convenient use, can be used to quantitatively detect ammonia in air on site, and can meet the field test requirements of industrial waste gas and workplace air.

Description

technical field [0001] The invention belongs to the field of environmental monitoring, in particular to a sensitive test paper for measuring ammonia in the air and a preparation and determination method thereof. Background technique [0002] Ammonia is a colorless gas with a strong pungent odor and dangerous properties such as corrosiveness. In ammonia workplaces, the time-weighted average allowable concentration (PC-TWA) of ammonia content in the air does not exceed 20mg / m 3 , the short-term exposure allowable concentration (PC-STEL) does not exceed 30mg / m 3 , the concentration immediately threatening to life or health (IDLH) is 360mg / m 3 . Ammonia is irritating to the eyes, nose, and throat of the human body. Inhaling a large amount of ammonia gas can cause short-term nasal congestion and a sense of suffocation. Eye contact can easily cause tears, so care should be taken when touching it. [0003] The test paper method is a cheap, easy-to-obtain, simple and fast method...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N21/82
CPCG01N21/783G01N21/82
Inventor 余萍高文皓冯莹
Owner BEIJING CONGSHI HEDE ENVIRONMENTAL PROTECTION TECH
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