A method for rapid determination of ammonia nitrogen content in biogas slurry

A technology for rapid determination of ammonia nitrogen content, which can be used in the preparation of test samples, material analysis by observing the impact on chemical indicators, and analysis by making materials undergo chemical reactions. It can solve inaccurate test results and dilution errors. , Distillation failure and other problems, to achieve the effect of simple experimental principle, no interference factors, and short reaction time

Active Publication Date: 2019-08-02
CHENGDU ACAD OF AGRI & FORESTRY SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, distillation and titration are used for the determination of ammonia nitrogen content in high-concentration ammonia-containing wastewater, but because the ammonia-nitrogen content measured by this method is low, repeated dilution is required for the determination of high-concentration ammonia-containing wastewater, which is not only cumbersome and time-consuming, but also in The dilution process will bring large errors; when pre-distilling some wastewater samples with alkali, there will be a lot of foam, bumping, etc., resulting in distillation failure
If the water sample contains substances that can be distilled out under this condition and can react with acid during titration, such as volatile amines, etc., the measurement result will be high and the detection result will be inaccurate

Method used

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  • A method for rapid determination of ammonia nitrogen content in biogas slurry

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Experimental program
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Embodiment 2

[0030] [Example 2] Sampling points were set and sampled in the upper, middle and lower layers of No. Ⅱ biogas pond respectively. There were 3 sampling points in each layer, and the volume of biogas slurry sampled at each sampling point was 200ml. All the obtained samples were mixed and filtered with a 150-mesh filter, and diluted 40 times to obtain 72L of the test solution. Heat the solution to be tested to 60 degrees Celsius, add 720mg of PAC, and gradually add 267mg of CTS under stirring. After three minutes, large flocs and clear supernatant appear in the solution. The pH of the supernatant is 6 when measured with pH test paper. Get the supernatant and drop it on the ammonia nitrogen detection test paper with a formaldehyde concentration of 71%, and obtain a pH of 5 after the reaction at the titration point.

Embodiment 3

[0031] [Example 3] Divide No. Ⅲ biogas pond into five height layers on average in the vertical direction, set two sampling points in each layer, and the volume of biogas slurry sampled at each sampling point is 200ml. All the obtained samples were mixed and filtered with a 200-mesh filter, and diluted 50 times to obtain 100L of the test solution. Heat the solution to be tested to 65 degrees Celsius, add 1.5g of PAC, and gradually add 0.5g of CTS under stirring. After a little more than one minute, large flocs and clear supernatant appear in the solution. Use pH test paper to measure the concentration of the supernatant. The pH is 6.5. Get the supernatant and drop it on the ammonia nitrogen detection test paper with a formaldehyde concentration of 78%, and obtain a pH of 5 after the reaction at the titration point.

Embodiment 4

[0032] [Example 4] Sampling points were set and sampled in the upper, middle and lower layers of No. IV marsh pond respectively. There were 3 sampling points in each layer, and the volume of biogas slurry sampled at each sampling point was 200ml. All the obtained samples were mixed and filtered with a 150-mesh filter, and diluted 40 times to obtain 72L of the test solution. Heat the solution to be tested to 60 degrees Celsius, add 720mg of PAC, and gradually add 267mg of CTS under stirring. After three minutes, large flocs and clear supernatant appear in the solution. The pH of the supernatant is 7 when measured with pH test paper. Get the supernatant and drop it on the ammonia nitrogen detection test paper with a formaldehyde concentration of 71%, and obtain a pH of 6 after the reaction at the titration point.

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Abstract

The invention discloses a method for rapidly measuring the ammonia nitrogen content of biogas fluid. The method comprises the pretreatment steps of sampling, filtering, diluting and the like, and comprises the following steps: heating to-be-measured liquid to 55 to 65 DEG C, adding 10 to 20 g of polyaluminium chloride (PAC) in per cube of to-be-measured liquid, and gradually adding chitosan (CTS) into the to-be-measured liquid under stirring until large floc and clear supernatant occur in the to-be-measured liquid; and dropping the supernatant into ammonia nitrogen detection test paper with the formaldehyde concentration being 71 to 78 percent, and measuring the ammonia nitrogen concentration through the concentration of hydrogen ions generated by reaction. The method has the advantages of high reaction speed, low detection cost and easiness in learning and mastering, and is suitable for rapid measurement of the ammonia nitrogen content of the biogas fluid in the actual production.

Description

technical field [0001] The invention relates to the technical field of quick detection of biogas slurry, in particular to a method for rapidly measuring ammonia nitrogen content in biogas slurry. Background technique [0002] Biogas slurry is a "biological pesticide" that is pollution-free, non-toxic, and drug-resistant. Experiments have shown that biogas slurry can prevent and control 23 diseases and 14 pests in 13 crops, including grain, cash crops, vegetables, and fruits. Biogas slurry contains a variety of active substances, such as amino acids, trace elements, plant growth hormones, B vitamins and certain antibiotics. Among them, butyric acid in organic acids and gibberellin, indole acetic acid and vitamin B12 in plant hormones have obvious inhibitory effects on pathogens, and ammonia and ammonium salts in biogas slurry have direct effects on some crop diseases and insect pests. In actual agricultural production, it is necessary to detect the relative content of ammoni...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/80G01N1/34G01N1/44
CPCG01N1/34G01N1/44G01N21/80
Inventor 樊战辉孙家宾陈光年彭朝晖
Owner CHENGDU ACAD OF AGRI & FORESTRY SCI
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