Method for determining total nitrogen amount of nitrate and nitrite in sample, and applications thereof

A technology for nitrite nitrogen and nitrite, applied in the field of nitrogen content detection in water samples, can solve the problems of long measurement time and large analysis error, and achieve the effects of rapid measurement, simple operation, good repeatability and reproducibility

Inactive Publication Date: 2018-12-11
CHINA PETROLEUM & CHEM CORP
View PDF2 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] (1) It is necessary to use two different methods to measure the content of nitrate nitrogen and nitrite nitrogen, and then calculate the sum, and the analysis error is relatively large
[0009] (2) Reagents for two methods are required, and the total measurement time is longer

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for determining total nitrogen amount of nitrate and nitrite in sample, and applications thereof
  • Method for determining total nitrogen amount of nitrate and nitrite in sample, and applications thereof
  • Method for determining total nitrogen amount of nitrate and nitrite in sample, and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] This example is used to illustrate the method of the present invention for determining the total amount of nitrate and nitrite nitrogen in a sample.

[0075] (1) Preparation of standard samples

[0076] Preparation of 0.1mol / L potassium permanganate solution: Weigh 1.58g of analytically pure potassium permanganate, dissolve it in distilled water, and dilute to 100mL after all the solution is dissolved.

[0077] Preparation of 1:3 sulfuric acid solution: Measure 25ml of concentrated sulfuric acid (concentration: 98%), slowly add it into 75ml of distilled water while stirring, and set aside after cooling.

[0078] Take 25mL of 5mg / L nitrite standard sample in a 50mL volumetric flask, add 5 drops of potassium permanganate solution and 5 drops of sulfuric acid solution to it at the same time at room temperature, then shake well and let stand for 5min, observe whether the solution is red, and Measure the pH of the solution. If there is no red color, continue to add potassiu...

Embodiment 2

[0084] This example is used to illustrate the method of the present invention for determining the total amount of nitrate and nitrite nitrogen in a sample.

[0085] (1) Preparation of standard samples

[0086]Preparation of 0.1mol / L potassium permanganate solution: Weigh 1.58g of analytically pure potassium permanganate, dissolve it in distilled water, and dilute to 100mL after all the solution is dissolved.

[0087] Preparation of 1:3 sulfuric acid solution: Measure 25ml of concentrated sulfuric acid (concentration: 98%), slowly add it into 75ml of distilled water while stirring, and set aside after cooling.

[0088] Prepare a mixed standard sample with nitrate nitrogen and nitrite nitrogen standard solutions, so that the content of nitrate nitrogen in the mixed standard sample is 10mg / L and the content of nitrite nitrogen is 5mg / L, take 25mL of the mixed standard sample in a 50mL volumetric flask , add 5 drops of potassium permanganate solution and 5 drops of sulfuric acid ...

Embodiment 3

[0094] This example is used to illustrate the method of the present invention for determining the total amount of nitrate and nitrite nitrogen in a sample.

[0095] (1) Sample preparation

[0096] Preparation of 0.1mol / L potassium permanganate solution: Weigh 1.58g of analytically pure potassium permanganate, dissolve it in distilled water, and dilute to 100mL after all the solution is dissolved.

[0097] Preparation of 1:3 sulfuric acid solution: Measure 25ml of concentrated sulfuric acid (concentration: 98%), slowly add it into 75ml of distilled water while stirring, and set aside after cooling.

[0098] Take 10mL of the effluent from the biochemical oxidation tank of a refinery sewage treatment plant in a sample tube, add 1 drop of potassium permanganate solution and 1 drop of sulfuric acid solution to it at the same time at room temperature, then shake it and let it stand for 5 minutes to observe whether the solution is red, and Measure the pH of the solution. If there is...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The present invention relates to the field of detection of the nitrogen content in water samples, particularly to a method for determining the total nitrogen amount of nitrate and nitrite in a sample,and applications thereof, and provides a method for determining the total nitrogen amount of nitrate and nitrite in a sample. The method comprises: (1) oxidizing nitrite in a test solution into nitrate in the presence of an oxidant and at a normal temperature; and (2) determining the total nitrogen amount of the nitrate in the test solution obtained in the step (1) by using a gas phase molecularabsorption spectrometry method, wherein the oxidizing agent in the step (1) is potassium permanganate and / or hydrogen peroxide. According to the present invention, the total nitrogen amount of nitrateand nitrite in the water sample can be accurately, conveniently and rapidly determined at one time by using the gas phase molecular absorption spectrometry method, ,such that the problems of cumbersome operation, high error and the like of the current determination of the total nitrogen amount of nitrate and nitrite are solved.

Description

technical field [0001] The invention relates to the field of nitrogen content detection in water samples, in particular to a method and application for measuring the total amount of nitrate and nitrite nitrogen in a sample. Background technique [0002] Nitrate nitrogen and nitrite nitrogen are important indicators for evaluating water quality polluted by organic matter. Drinking water with high nitrate and nitrite nitrogen content for a long time will cause great harm to human health. Therefore, accurate determination of drinking water and industrial The total amount of nitrogen in water is of great significance for correct water quality evaluation and judging whether it is suitable for drinking. For the water treatment process, some require the determination of nitrate nitrogen and nitrite nitrogen separately, and some require the determination of the total amount of both. [0003] According to the current national standards, whether it is required to detect nitrate and n...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N1/38
CPCG01N1/38G01N21/31
Inventor 沈锦芳叶华盛徐丽萍邵柯迪蔡方方檀革江
Owner CHINA PETROLEUM & CHEM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap