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Method for detecting nitrate nitrogen content of water-soluble fertilizer and preparation method thereof

A detection method, the technology of nitrate nitrogen, applied in the direction of chemical analysis by titration method, can solve the problems of inaccuracy, large detection influence, long time, etc., and achieve the effect of improving detection efficiency

Inactive Publication Date: 2019-01-22
上海永通生态工程股份有限公司
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  • Application Information

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Problems solved by technology

[0002] The determination of nitrate nitrogen content in water-soluble fertilizers, compound fertilizers and purchased raw materials is currently based on the Agricultural Industry Standard NY / T 1977-2010 of the People's Republic of China and the National Standard GB / T 8572-2010 of the People's Republic of China. Nitrogen alloy (Tweed alloy) reduction method, this method needs to stand for 10 minutes before distillation in the detection process, the time is longer, if the ambient temperature is lower, the actual time is longer; at the same time, Kjeldahl A large amount of foam will be produced during the distillation of the nitrogen instrument. If you are not careful, the solution in the digestive tube will pour into the conical flask, making the detection data unstable or inaccurate
At the same time, some surfactants are added to the market, especially water-soluble fertilizers, so that more foam will be generated during distillation, which has a great impact on the detection

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  • Method for detecting nitrate nitrogen content of water-soluble fertilizer and preparation method thereof
  • Method for detecting nitrate nitrogen content of water-soluble fertilizer and preparation method thereof
  • Method for detecting nitrate nitrogen content of water-soluble fertilizer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Determination of nitrate-nitrogen content in water-soluble fertilizers containing only nitrate-nitrogen

[0033] (1) Accurately weigh 0.4215 g of the sample to be tested that has been pulverized and mixed evenly (the content of nitrate nitrogen is not more than 60 mg), and place it in a distillation tube to an accuracy of 0.0001 g, add 70 mL of pure water, and after fully dissolving, add 8 g of zinc-sulfuric acid Ferrous reducing agent. Shake it gently, put it on the azotometer, add 20mL of 400g / L sodium hydroxide solution, distill directly without waiting, and turn on the instrument according to the instruction manual of the automatic azotometer;

[0034] (2) Add 50mL of sulfuric acid solution and 4-5 drops of mixed indicator into a 500mL triangular flask, place the triangular flask on the ammonia liquid receiving tray of the distillation instrument, connect the distillation tube to the distillation head of the instrument, and start distillation. When it reaches about...

Embodiment 2

[0040] Determination of nitrate nitrogen content in water-soluble fertilizers containing nitrate nitrogen and ammonium nitrogen

[0041] (1) Determination of ammonium nitrogen content: First, accurately weigh 0.5-2 g of a uniformly pulverized sample, accurate to 0.0001 g, place it in a distillation tube, add 70 mL of pure water, and add 20 mL of 400 g / L sodium hydroxide solution. Turn on the instrument according to the instruction manual of the automatic nitrogen determination distiller, add 50mL of sulfuric acid solution and 4-5 drops of mixed indicator into the 500mL triangular flask, place the triangular flask on the ammonia liquid receiving tray of the distillation apparatus, the distillation tube and the distillation head of the apparatus When the distilled liquid reaches about 300mL, use pH test paper to check the droplet of the ammonia liquid output nozzle, and end the distillation if it does not show alkalinity. Finally back-titration excessive sulfuric acid with sodiu...

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Abstract

The technical scheme discloses a method for detecting nitrate nitrogen content of a water-soluble fertilizer. The method comprises the following steps: step 1), determining whether a to-be-detected sample contains ammonium nitrogen, and if not, performing step 2), and if yes, performing step 3); step 2), dissolving the to-be-detected sample in water, fully dissolving, then adding a proper amount of a zinc-ferrous sulfate reducing agent, completely converting the nitrate nitrogen in the sample into the ammonium nitrogen, and then titrating to obtain the content of the nitrate nitrogen in the sample; and step 3), titrating the to-be-detected sample according to the titration operation in step 2), measuring the content of the ammonium nitrogen in the sample, and marking as omega 1; re-takingthe same amount of to-be-detected sample, performing the operation of step 2) to obtain the total content of the nitrate nitrogen and the ammonium nitrogen in the sample, and marking as omega 2; and finally, calculating the content of the nitrate nitrogen in the sample as omega 1-omega 2. The method for detecting the nitrate nitrogen content of the water-soluble fertilizer provided by the technical scheme of the invention greatly improves the detection efficiency and accuracy.

Description

technical field [0001] The invention relates to the technical field of fertilizers, in particular to a method for detecting the nitrate nitrogen content of water-soluble fertilizers. Background technique [0002] The determination of nitrate nitrogen content in water-soluble fertilizers, compound fertilizers and purchased raw materials is currently based on the Agricultural Industry Standard NY / T 1977-2010 of the People's Republic of China and the National Standard GB / T 8572-2010 of the People's Republic of China. Nitrogen alloy (Tweed alloy) reduction method, this method needs to stand for 10 minutes before distillation in the detection process, the time is longer, if the ambient temperature is lower, the actual time is longer; at the same time, Kjeldahl A large amount of foam will be generated during the distillation of the nitrogen meter. If you are not careful, the solution in the digestive tube will pour into the Erlenmeyer flask, making the detection data unstable or i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 石称华陈小兵季本洋
Owner 上海永通生态工程股份有限公司