Method for determining total nitrogen content in nitrate-nitrogen-containing compound fertilizer through post-distillation titration method

A technology of compound fertilizer and nitrate nitrogen, which is applied in the direction of chemical analysis by titration method, can solve the problems of affecting the efficiency of the experiment, difficult to control the process, and low detection results, and achieve accurate quantitative results, convenient methods, and reliable methods. Effect

Active Publication Date: 2013-03-06
内蒙古谱尼测试技术有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, when chromium powder and hydrochloric acid are added and heated, a large amount of foam will be generated, the process is difficult to control, and it will overflow if you don’t pay attention, the test result will be low, and it will affect the efficiency of the experiment

Method used

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  • Method for determining total nitrogen content in nitrate-nitrogen-containing compound fertilizer through post-distillation titration method
  • Method for determining total nitrogen content in nitrate-nitrogen-containing compound fertilizer through post-distillation titration method
  • Method for determining total nitrogen content in nitrate-nitrogen-containing compound fertilizer through post-distillation titration method

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Experimental program
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Effect test

Embodiment 1

[0014] Detection of Total Nitrogen Content in Compound Fertilizer Samples Containing Nitrate Nitrogen

[0015] (1) Determination of Kjeldahl nitrogen: Kjeldahl nitrogen includes ammonium nitrogen and organic nitrogen. Accurately weigh 1.3507 g of the sample after pulverization and mixing, and add 2 g of mixed catalyst (potassium sulfate: ketone sulfate=20 : 1) and 10mL of concentrated sulfuric acid, insert a long-necked glass funnel, place it on the digestion furnace, adjust its temperature to 470°C, heat until the sample solution is colorless and transparent or off-white, then stop, and the pending nitrogen tube is cooled to room temperature and placed On the azotometer, add boric acid solution into a 500ml triangular flask as the absorption liquid, add 4-5 drops of mixed indicator and place the triangular flask on the liquid ammonia receiving device of the azotometer, add water and sodium hydroxide to the azotometer solution, connect the distillation device, open the azotome...

Embodiment 2

[0021] Determination of Total Nitrogen Content in Compound Fertilizer Samples with Known Content

[0022] (1) Determination of Kjeldahl nitrogen: Kjeldahl nitrogen includes ammonium nitrogen and organic nitrogen. Accurately weigh 0.5675 g of the sample after pulverization and mixing, and add 2 g of mixed catalyst (potassium sulfate: ketone sulfate=20 : 1) and 10mL of concentrated sulfuric acid, insert a long-necked glass funnel, place it on the digestion furnace, adjust its temperature to 470°C, heat until the sample solution is colorless and transparent or off-white, then stop, and the pending nitrogen tube is cooled to room temperature and placed On the azotometer, add boric acid solution into a 500ml triangular flask as the absorption liquid, add 4-5 drops of mixed indicator and place the triangular flask on the liquid ammonia receiving device of the azotometer, add water and sodium hydroxide to the azotometer solution, connect the distillation device, open the azotometer t...

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Abstract

The invention relates to a method for determining the total nitrogen content in a nitrate-nitrogen-containing compound fertilizer through a post-distillation titration method. According to the invention, contents of nitrogen of different forms, including Kjeldahl nitrogen, nitrate nitrogen and ammonium nitrogen, are determined respectively; and total nitrogen content is then calculated. The determination method of the total nitrogen content in nitrate-nitrogen-containing compound fertilizer is accurate and reliable, and a relative average deviation is smaller than 10%. Therefore, the method provided by the invention provides a reliable and easy-to-practice method for detecting total nitrogen content in nitrate-nitrogen-containing compound fertilizer, such that research and production requirements can be satisfied.

Description

technical field [0001] The invention relates to a method for determining the total nitrogen content in nitrate nitrogen-containing compound fertilizers by titration after distillation, in particular to a method for determining the total nitrogen content by separately measuring the nitrogen content in different forms and then calculating the total nitrogen content . Background technique [0002] Agriculture is the lifeblood of the national economy, and fertilizers are the basis of agricultural production. Fertilizers are materials that provide plant nutrients as the main function, and can be divided into inorganic fertilizers, organic fertilizers, organic-inorganic compound fertilizers, and microbial fertilizers. Due to the characteristics of containing a variety of nutrient elements, reasonable nutrient combination, good physical properties (granular), convenient packaging, storage and transportation, the use of compound fertilizers is very common in today's agricultural pr...

Claims

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Application Information

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IPC IPC(8): G01N31/16
Inventor 宋薇
Owner 内蒙古谱尼测试技术有限公司
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