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Special ammonia indicator for analyzing ammonia content by flow injection instruments and preparation thereof

A flow injection and indicator technology, applied in the field of agricultural analysis, can solve the problems of high price, high analysis cost, and high price

Inactive Publication Date: 2009-11-25
HUAZHONG AGRI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the flow injection analyzers currently equipped in domestic laboratories in China are all imported from abroad, and the ammonia indicators used are all patented products of the instrument company, which are relatively expensive and the analysis cost is high
For example, the special ammonia indicator for the FIAstar-5000 flow injection analyzer of the Swedish FOSS company is 235 US dollars per 5 grams, which is expensive and cannot be supplied in time

Method used

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  • Special ammonia indicator for analyzing ammonia content by flow injection instruments and preparation thereof
  • Special ammonia indicator for analyzing ammonia content by flow injection instruments and preparation thereof
  • Special ammonia indicator for analyzing ammonia content by flow injection instruments and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1 (preparation embodiment)

[0028] A. The components and proportioning ratio by mass ratio are: cresol red: bromocresol purple: bromothymol blue 1:2:1.

[0029] B, solid powder preparation: take by weighing three kinds of reagents of analytically pure cresol red, bromocresol violet and bromothymol blue respectively 1.40 grams in the agate mortar, then take by weighing 3.60 grams of analytically pure potassium chloride, make the total The mass is up to 5.00 grams, wherein the mass of potassium chloride accounts for 72.0% of the total mass; the above four reagents are evenly ground, bottled and sealed;

[0030] C. Preparation of storage solution: Accurately weigh 1.00g of the special ammonia indicator solid powder prepared in step B, dissolve it in 10mL of 0.1M NaOH and 10mL of absolute ethanol, then dilute to 200mL with distilled water, shake well, and make volume / weight It is a 0.50% special ammonia indicator storage solution, stored in a 4°C freezer.

[0...

Embodiment 2

[0032] Embodiment 2 (application embodiment)

[0033] (1) Materials and methods

[0034] Ammonia indicators and analytical instruments:

[0035] The ammonia indicator is: 1. the special ammonia indicator of the present invention, which is prepared as described in Example 1, and 2. the reference-ammonia standard indicator, which is a special ammonia indicator purchased from Sweden FOSS company.

[0036] Analytical instrument: UV-visible spectrophotometer (model: U-1800Spectrophotometer, place of origin: Japan, company: HITACHI) is used to detect and analyze the analysis of the absorption spectrum of the chromogenic solution after the reaction between two special ammonia indicators and ammonium. A flow injection analyzer (model: FIAstar 5000Analyzer: place of origin: Sweden, company: FOSS) is used for the analysis of the absorbance value and nitrogen content of the chromogenic solution.

[0037] (2) Test samples and analysis

[0038] The tested samples were 33 surface water (...

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Abstract

The invention belongs to the technical field of agricultural analysis, specifically relates to a special ammonia indicator for analyzing ammonia content by flow injection instruments. An import flow injection instrument is used for analyzing the ammonia contents of samples such as animal and plant life, food, water and soil, which has been normally-used instrument device and technology in domestic universities and colleges as well as scientific research, animal and plant life and food detection and check units. However, the most important reagent that is ammonia indicator for analyzing ammonia content was monopolized by foreign companies all the time, and the cost is expensive. The invention provides the proper mass ratio of prepared special ammonia indicators of flow injection instruments that are cresol red, bromcresol purple and bromothymol blue. The main technical targets of the special ammonia indicator in the invention all meet analysis requirements, and the cost of the reagent is 3.3% of that of contrast reagent.

Description

technical field [0001] The invention belongs to the technical field of agricultural analysis, and in particular relates to a special ammonia indicator used for measuring the ammonia content of a flow injector. Background technique [0002] Nitrogen is a component of many important organic substances in plants, and is called the life element of plants. Therefore, nitrogen nutrition is directly related to crop yield and quality. The nitrogen needed by plants mainly comes from the soil. However, the available nitrogen content of most soils is lower than the level required for plant growth, so the application of nitrogen fertilizer is the most basic fertilization measure to improve crop yield. At present, the highest fertilization rate can reach 200kg / hm 2 , however, excessive fertilization not only increases the investment in agricultural production, but also causes pollution to the environment. Therefore, accurate and rapid determination of total nitrogen and available nitr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N35/08G01N21/31
Inventor 叶祥盛徐芳森
Owner HUAZHONG AGRI UNIV
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