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Stable nitrite test paper and preparation method thereof

A technology of nitrite and test paper, applied in the direction of measuring devices, instruments, and material analysis through optical means, can solve the problems of inconvenient use, easy discoloration and failure, etc., and achieve the effect of convenient use, good stability and high accuracy

Pending Publication Date: 2021-09-21
神美科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the shortcomings of the Griess reagent loaded on the filter paper, which is easy to absorb moisture and lose its color when exposed to light, the test paper needs to be stored at 2~10°C, which makes it inconvenient to use.

Method used

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  • Stable nitrite test paper and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1 Preparation of nitrite test paper

[0024] Preparation of soaking solution: Weigh 2 g of tartaric acid, 0.2 g of sulfonamide, and 0.05 g of naphthaleneethylenediamine hydrochloride, and add 100 mL of water to dissolve.

[0025] Protective agent coating solution: weigh 0.2g of sodium alginate, add 100mL of water to dissolve.

[0026] Preparation of test paper: Immerse 300*200mm rapid quantitative filter paper in the above soaking solution for 2 minutes, take it out and put it in a drying oven at 50°C to dry for 2 hours, immerse it in the protective agent coating solution for 5-15 seconds, take it out and dry it immediately. The prepared test paper is white.

[0027] Test strip preparation: cut the above test paper into 6mm strips, paste them on a plastic board with a thickness of 0.15mm and a width of 6mm with glue or double-sided tape, and cut them into 0.6mm test strips with a paper cutter. Store in a test paper bucket with a desiccant and away from lig...

Embodiment 2

[0028] The preparation of embodiment 2 standard color card

[0029] Prepare a series of nitrite standard solutions with sodium nitrite: the nitrite concentrations are: 0mg / L, 2.0mg / L, 5.0mg / L, 10mg / L, 20mg / L, 40mg / L, 80mg / L, use The test papers prepared in Example 1 were tested respectively.

[0030] Test method: Immerse the test paper in the water sample for 1 second, shake off the excess water, and compare it with the international Pantone color card after standing for 30 seconds, record the color number, and print.

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Abstract

The invention discloses a preparation method of stable nitrite test paper, and the preparation method is characterized in that the method comprises the following steps: preparation of a soak solution: dissolving tartaric acid, sulfanilamide and N-(1-naphthyl) ethylenediamine hydrochloride in water to prepare the soak solution; preparation of test paper: soaking rapid quantitative filter paper in the soak solution for 2-5 minutes, taking out and drying, then soaking in a protective agent coating solution for 5-15 seconds, taking and drying immediately, wherein the prepared test paper is white; and preparation of a test strip: cutting the test paper into paper strips of 6mm, pasting the paper strips on a plastic plate by using glue or a double-sided adhesive tape, cutting the paper strips into test strips of 0.6 mm by using a paper cutter, and preserving the test strips in a dark place. The nitrite test paper provided by the invention has a nitrite detection range of 0-80mg / L, and is suitable for detecting nitrite in water bodies such as surface water, sewage and seawater. The test paper is good in stability and can be stored at normal temperature.

Description

technical field [0001] The invention belongs to the technical field of environmental detection, and in particular relates to a stable nitrite test paper and a preparation method thereof. Background technique [0002] Nitrite is widely present in soil, natural water sources, food and physiological systems. Nitrite can affect the aquaculture industry through its toxicity to aquatic animals such as fish and crustaceans, because nitrite can reach toxic concentrations in high-density farming systems and be fatal to high-concentration biological populations. High concentrations of nitrite will bring eutrophication and hidden dangers to the ecological physiological system, and are harmful to the health of the human body and other organisms. [0003] With the rapid advancement of population growth, industrialization and urbanization, the shortage of water resources and water pollution are becoming more and more serious. A large amount of sewage is produced in human production and ...

Claims

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Application Information

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IPC IPC(8): G01N21/78
CPCG01N21/78G01N2021/7759
Inventor 崔秀菊张襄康杏芳何永峰郑博英张亮亮王孟梅石伟杰
Owner 神美科技有限公司
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