A kind of ammonia nitrogen detection test paper and application method thereof

A technology for detecting test paper and ammonia nitrogen, applied in the field of chemical analysis, can solve the problems of limiting the rapid determination of ammonia nitrogen, cumbersome measurement steps, long color development time, etc., and achieves the effects of short color development time, low price and strong mobility

Inactive Publication Date: 2018-01-09
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional measurement steps are cumbersome, the color development time is long, and it takes about 1 hour, and the water sample must be transported to the laboratory for measurement, which is prone to secondary pollution and limits the rapid determination of ammonia nitrogen.

Method used

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  • A kind of ammonia nitrogen detection test paper and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. Prepare the ammonia-free aqueous solution containing sodium salicylate 280g / L, potassium sodium tartrate 50g / L and sodium nitroferricyanide 0.40g / L. Immerse all the quantitative medium-speed filter paper in the solution, and shake it on a constant temperature oscillator for 90 minutes. Take out the filter paper, place it in parallel at room temperature, hang it in the air to dry, cut it and seal it for later use, and then make ammonia nitrogen test paper.

[0021] 2. Activator: take the calibrated analytically pure sodium hypochlorite, dilute it with ammonia-free water and sodium hydroxide solution (2mol / L) to form sodium hypochlorite containing an available chlorine concentration of 3.5g / L and a free alkali concentration of 0.75mol / L (calculated as NaOH) Use liquid.

[0022] 3. Preparation of standard color chart: Accurately weigh ammonium chloride (dried at 110°C for 2 hours) and dissolve it in ammonia-free water to prepare nitrogen-containing standard solutions w...

Embodiment 2

[0027] 1. Prepare the ammonia-free aqueous solution that concentration is to contain sodium salicylate 380g / L, potassium sodium tartrate 68g / L and sodium nitroferricyanide concentration 0.54g / L. Immerse all the quantitative medium-speed filter paper in the solution, and shake it on a constant temperature oscillator for 90 minutes. Take out the filter paper, place it in parallel at room temperature, hang it in the air to dry, cut it and seal it for later use, and then make ammonia nitrogen test paper.

[0028] 2. Activator: take the calibrated analytically pure sodium hypochlorite, dilute it with ammonia-free water and sodium hydroxide solution (2mol / L) to form sodium hypochlorite containing an available chlorine concentration of 3.5g / L and a free alkali concentration of 0.75mol / L (calculated as NaOH) Use liquid.

[0029] 3. Preparation of standard color chart: Accurately weigh ammonium chloride (dried at 110°C for 2 hours) and dissolve it in ammonia-free water to prepare nitr...

Embodiment 3

[0032] Other steps are the same as in Example 1, except that the ammonia-free aqueous solution contains 330 g / L of sodium salicylate, 59 g / L of potassium sodium tartrate and 0.47 g / L of sodium nitroferricyanide.

[0033] The result measured with this test paper is compared with the result measured by the standard method with Table 1 in Example 1, consistent with the standard result, and the test paper can accurately measure the ammonia nitrogen content in various water qualities.

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Abstract

A test paper for detecting ammonia nitrogen and its application method. The test paper is prepared by the following method, including the following steps: (1) Reagent solution preparation: take analytically pure sodium salicylate, potassium sodium tartrate and sodium nitroferricyanide solution In ammonia-free water, prepare a solution containing 280-380 g of sodium salicylate, 50-68 g of sodium potassium tartrate and 0.40-0.54 g of sodium nitroferricyanide per liter; Immerse all the fast filter paper in the solution (1), and shake it on a constant temperature oscillator for 60-120 minutes; (3) Forming: Take out the filter paper, place it in parallel at room temperature, hang it in the air to dry, cut it and seal it for later use. The test paper is simple to make, easy to operate, short in color development time and strong in mobility, and can quickly and accurately determine the content range of ammonia nitrogen in the effluent.

Description

technical field [0001] The invention relates to a test paper for quickly detecting the concentration of ammonia nitrogen in a water body and an application method thereof, belonging to the field of chemical analysis. Background technique [0002] Ammonia nitrogen refers to nitrogen existing in the form of free ammonia and ammonium ions in water. Ammonia nitrogen is a nutrient in the water body, which can lead to eutrophication of the water body. It is the main oxygen-consuming pollutant in the water body. It is toxic to fish and some aquatic organisms, and may kill aquatic organisms, and may also poison drinking water organisms. die. Ammonia nitrogen in water can be converted into nitrite under certain conditions. If consumed for a long time, nitrite in water will combine with protein to form nitrosamine, which is a strong carcinogen and extremely harmful to human health. Ammonia nitrogen, as the main excessive pollutant, occurs frequently in the seven major water systems,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/78
Inventor 李红岩袁俊生安莎莎李亚宁李鑫冉陈淼
Owner HEBEI UNIV OF TECH
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