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Method for testing ammonia nitrogen by using flow injection analyzer and application thereof

A flow injection and analyzer technology, applied in the field of analysis and detection, can solve the problems of large changes in the acidity of the buffer solution and the deviation of the test results of the samples to be tested, and achieve the effect of improving stability

Pending Publication Date: 2020-11-24
江门新财富环境管家技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the existing method of utilizing flow injection analyzer to test the ammonia nitrogen in the river water, because the salinity in the river water changes greatly, the acidity of the buffer solution in the test can be caused to change greatly, so that the test results of the samples to be tested produce large fluctuations. deviation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050]In this example, the concentration of preparations are respectively 0.00mg / L, 0.10mg / L, 0.20mg / L, 0.50mg / L, 1.00mg / L, 3.00mg / L, 5.00mg / L, 8.00mg / L and 10.00mg / L For ammonia nitrogen standard solution of mg / L, use the method for measuring ammonia nitrogen in this scheme, and measure the absorbance values ​​of different concentrations in the flow injection analyzer Baode BDFIA-8000. The parameters in the flow injection analyzer are set as follows: the needle washing time is 10s, injection time 140s, time to enter carrier flow 60s, time to reach valve 200s, peristaltic pump speed 35r / min, set temperature 2 to 50°C, injection time 60s, peak exit time 30s, peak width 55, sample cycle time 220s , set the temperature 1 to 120°C, the detector light source is a halogen lamp, and the wavelength is 660nm. Taking the ammonia nitrogen concentration as the abscissa and the corresponding absorbance as the ordinate, draw the working curve, and use the linear fitting method to obtain the...

Embodiment 2

[0064] The difference between this embodiment and Example 1 is that: the first aspect of this embodiment provides a method for testing ammonia nitrogen using a flow injection analyzer, and the method is based on a flow injection analyzer for testing, including the following step:

[0065] (1) Ammonia nitrogen distillation is carried out to the water sample to be tested by the distillation reagent to obtain analyte A; the solute of the distillation reagent is a mixture of sodium tetraborate and sodium hydroxide, and the solvent is ammonia-free, the specific preparation method of the distillation reagent Method: Add 600mL of ammonia-free water into a 1L volumetric flask, then weigh and dissolve 4.76g of sodium tetraborate, then add 0.272g of sodium hydroxide, mix well under magnetic stirring, and dilute to the 1L mark with ammonia-free water. Adjust the pH value of this solution to 9.5 with sodium hydroxide to obtain the distillation reagent. The sodium tetraborate was purchase...

Embodiment 3

[0076] The difference between this embodiment and Embodiment 1 is that: the first aspect of this embodiment provides a method for testing ammonia nitrogen using a flow injection analyzer, and the method is based on a flow injection analyzer for testing, including the following step:

[0077] (1) Ammonia nitrogen distillation is carried out to the water sample to be tested by the distillation reagent to obtain analyte A; the solute of the distillation reagent is a mixture of sodium tetraborate and sodium hydroxide, and the solvent is ammonia-free, the specific preparation method of the distillation reagent Method: Add 600ml of ammonia-free water into a 1L volumetric flask, then weigh and dissolve 4.76g of sodium tetraborate, then add 0.272g of sodium hydroxide, mix well under magnetic stirring, and dilute to the 1L mark with ammonia-free water. Adjust the pH value of this solution to 9.5 with sodium hydroxide to obtain the distillation reagent. The sodium tetraborate was purch...

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Abstract

The invention relates to a method for testing ammonia nitrogen by using a flow injection analyzer, which is used for testing on the basis of the flow injection analyzer, and comprises the steps of (1)carrying out ammonia nitrogen distillation on a to-be-tested water sample by using a distillation reagent to obtain a to-be-analyzed substance A; (2) absorbing the to-be-analyzed substance A by adopting an acidic absorbent to obtain a to-be-detected solution B; (3) sequentially adding a buffer solution, a catalyst and a color developing agent into the to-be-detected solution B to obtain a to-be-detected solution C; (4) adding an oxidant into the to-be-detected liquid C to obtain a to-be-detected object D; and (5) determining the absorbance value of the to-be-detected substance D, and calculating the corresponding ammonia nitrogen concentration. According to the scheme, the buffer solution is a mixture of tartrate and citrate, and the buffer solution taking tartrate and citrate as solutesnot only can stabilize the pH in the system, but also has the effects of masking metal ions and interferents in the to-be-tested solution and improving the test precision.

Description

technical field [0001] The application belongs to the technical field of analysis and detection, and in particular relates to a method for testing ammonia nitrogen by using a flow injection analyzer and its application. Background technique [0002] Ammonia nitrogen (NH 3 -N) refers to free ammonia (NH 3 ) or ammonium salt (NH 4+ ) in the form of nitrogen compounds in water, which is one of the total control indicators of water quality pollutants in my country. With the further improvement of my country's wastewater discharge standards, my country's water treatment industry is also developing relatively fast. The flow injection analyzer is based on the continuous flow method, injecting the reaction reagent and the sample to be tested in proportion into a closed and continuous flow carrier, a color reaction occurs in the chemical reaction unit, and the signal value is measured in the detector , determine the concentration of the sample to be tested according to the standa...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N1/28
CPCG01N21/31G01N1/28
Inventor 罗平王娟叶汝汉陈燕玲林小凤赵海华黄炳杰黄作新黎金盛杨宗兴
Owner 江门新财富环境管家技术有限公司
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