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Mixed indicator test paper for measuring ammonia concentration in air, preparation method and detection method thereof

A technology of mixed indication and determination method, which is applied in the direction of material analysis, measuring devices, instruments, etc. by observing the influence of chemical indicators, which can solve the problems of sharp color change and narrowing of color change range, so as to achieve sensitive response and low production cost. Low, high-precision effects

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

Bromocresol green-methyl red mixed indicator uses the complementary effect between colors to narrow the range of color change, so that the color change at the end point is sensitive

Method used

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  • Mixed indicator test paper for measuring ammonia concentration in air, preparation method and detection method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The mixed indicator test paper for measuring the ammonia concentration in the air is the filter paper loaded with bromocresol green, methyl red, acid and Span-80 on the chromatographic filter paper strip; wherein, by mass ratio, bromocresol green: methyl Red: H 2 SO 4 : Non-ionic surfactant Span-80=2:0.32:1.0:5.1×10 -3 .

[0054] The mixed indicator test paper for measuring the ammonia concentration in the air has a specification of 80mm in length and 4mm in width.

[0055] The preparation method of the mixed indicator test paper for measuring ammonia concentration in air may further comprise the steps:

[0056] Step 1, Prepare Soaking Solution

[0057] Prepare bromocresol green-methyl red ethanol solution: weigh appropriate amount of bromocresol green and methyl red, dissolve in absolute ethanol, and dilute to 100mL with absolute ethanol;

[0058] Take a certain volume of bromocresol green-methyl red ethanol solution, add H 2 SO 4 Solution, add non-ionic surfact...

Embodiment 2

[0083] The mixed indicator test paper for measuring the ammonia concentration in the air is the filter paper loaded with bromocresol green, methyl red, acid and Span-80 on the chromatographic filter paper strip; wherein, by mass ratio, bromocresol green: methyl Red: H 2 SO 4 : Non-ionic surfactant Span-80 = 1.0: 0.188: 0.8: 3.5×10 -3 .

[0084] The mixed indicator test paper for measuring the ammonia concentration in the air has a specification of 60mm in length and 3mm in width.

[0085] The preparation method of the mixed indicator test paper for measuring ammonia concentration in air may further comprise the steps:

[0086] Step 1, Prepare Soaking Solution

[0087] Preparation of bromocresol green ethanol solution: Weigh an appropriate amount of bromocresol green, dissolve it in absolute ethanol, and dilute to 100mL with absolute ethanol;

[0088] Preparation of methyl red ethanol solution: Weigh an appropriate amount of methyl red and dissolve it in absolute ethanol, ...

Embodiment 3

[0106] A mixed indicator test paper for measuring ammonia concentration in air, same as Example 1.

[0107] A preparation method of a mixed indicator test paper for measuring the ammonia concentration in the air is the same as in Example 1.

[0108]A kind of detection method of the mixed indicator test paper of measuring the ammonia concentration in the air, with embodiment 1, the difference is that, according to the linear regression equation of the length of the discoloration band and the ammonia concentration in the air, the ammonia measuring scale made; Measure the ammonia concentration corresponding to the length of the reaction color band.

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Abstract

The invention discloses a mixed indicator test paper for measuring ammonia concentration in air, a preparation method, and a detection method thereof, and belongs to the technical field of environmental monitoring and industrial hygiene. The test paper is loaded with bromocresol green, methyl red, acid, and nonionic surfactant on the base paper, and has a mass ratio of the bromocresol green: the methyl red: the acid: the non-ionic surfactant=(1.0-2.0): (0.188-0.75): (0.75-2.0): (2.5-7)x10<-3>. The preparation method comprises the following steps: preparing a soaking solution according to the mass ratio; soaking the base paper; and performing drying and encapsulating. The detection method comprises steps that the ammonia in the detection area air reacts with the mixed reagent of the test paper, and the color of the test paper is changed from claret to green; and the concentration of ammonia in the detection area air is obtained according to the relationship between the length of the color changing strip of the test paper and the ammonia concentration. The test paper has the advantages of being sensitive in reaction, high in precision, low in manufacturing cost, convenient to use, and the like, and has practicability and remarkable economic benefits.

Description

technical field [0001] The invention belongs to the technical field of environmental monitoring and industrial sanitation, and in particular relates to a mixed indicator test paper for measuring ammonia concentration in air and a preparation and detection method thereof. Background technique [0002] Ammonia is an important basic chemical raw material and product. In the production, transportation, storage, and use of ammonia, if pipelines, valves, storage tanks, etc. are damaged, leakage of ammonia gas can cause poisoning. [0003] The Occupational Hygiene Standard of the People's Republic of China GBZ2.1-2007 "Occupational Exposure Limits of Hazardous Factors in the Workplace" allows workers to have long-term and repeated exposure to ammonia-related occupational activities without causing harmful effects on the health of the vast majority of contacts. The harmful level has a clear limit value regulation: in the ammonia workplace, the time-weighted average allowable concen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
CPCG01N21/783G01N2021/7759
Inventor 余萍胡雪高俊杰
Owner SHENYANG LIGONG UNIV
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