Online detection device of water dissolved-out nitrogen nutrients of chemical fertilizer

A detection device and water-soluble technology, applied in the measurement of color/spectral characteristics, etc., can solve the problems of poor repeatability and long time consumption, and achieve the effect of large amount of data, shortened experimental time, and high data repeatability

Active Publication Date: 2013-07-24
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide an online detection device for nitrogen nutrients dissolved in chemical fertilizer water, which is a method for quickly analyzing nitrogen nutrients dissolved in chemical fertilizer water, and can perform rapid online detection of various nitrogen nutrients dissolved in chemical fertilizers through multiple channels at the same time to solve the existing problems. Problems of time-consuming and poor reproducibility of technical fertilizer dissolved nitrogen nutrient analysis methods

Method used

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  • Online detection device of water dissolved-out nitrogen nutrients of chemical fertilizer
  • Online detection device of water dissolved-out nitrogen nutrients of chemical fertilizer
  • Online detection device of water dissolved-out nitrogen nutrients of chemical fertilizer

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0047] Specific embodiment one, measure urea flow detection standard curve

[0048] 1. Reagents and Materials

[0049] Sulfuric acid solution, c(1 / 2H2SO4)= 0.5 mol / L.

[0050] Sulfuric acid solution, c(1 / 2H2SO4)= 8 mol / L.

[0051] p-Dimethylaminobenzaldehyde Chromogenic Solution, 3.625 g / L

[0052] Dissolve 3.625 g p-dimethylaminobenzaldehyde in the sulfuric acid solution of 75 mL[c(1 / 2H2SO4)=8 mol / L], set the volume to 1 L and place in urea developer pool 6; 1L [(1 / 2H2SO4) = 0.5 mol / L] sulfuric acid solution was charged into the treatment pool 7.

[0053] Urea standard solution, 20 g / L

[0054] 2. Preparation of urea standard colorimetric solution

[0055] As shown in Table 1, inject the standard urea solution into ten 25 mL colorimetric tubes respectively.

[0056] Table 1 urea standard sample addition amount

[0057] Volume of urea standard solution (mL)

Corresponding concentration of urea after color development (g / L)

0

0

0.3

0.2 ...

specific Embodiment 2

[0064] Specific embodiment two, measure ammonium ion flow detection standard curve

[0065] 1. Reagents and Materials

[0066] Nessler's reagent, mercuric chloride-potassium iodide-sodium hydroxide (HgCl2-KI-NaOH):

[0067] Weigh 12g of sodium hydroxide (NaOH), dissolve in 60mL of water and cool to room temperature.

[0068] Weigh 1.7g of mercuric chloride (HgCl2) and dissolve it in 30mL of water.

[0069] Weigh 3.5g of potassium iodide (KI) and dissolve in 10 mL of water.

[0070] Then, under stirring, slowly add mercuric chloride (HgCl2) solution into potassium iodide (KI) solution until a red precipitate is formed and no longer dissolves.

[0071] Under stirring, slowly add cold sodium hydroxide (NaOH) solution to the above mixed solution, and then add the remaining mercuric chloride (HgCl2) solution to make Nessler's reagent. Stand in the dark for 24 hours, pour out the supernatant, and store it in the brown ammonium root chromogen pool 14.

[0072] Ammonium chloride ...

specific Embodiment 3

[0081] Specific embodiment three, measure nitrate flow detection standard curve

[0082] 1. Reagents and Materials

[0083]Potassium nitrate standard solution, 44.28 mg / L in terms of nitrate content

[0084] Potassium persulfate alkaline solution, 40 g / L

[0085] Hydrochloric acid solution (1+9)

[0086] 2. Preparation of Potassium Nitrate Standard Colorimetric Solution

[0087] As shown in Table 3, inject the potassium nitrate standard solution into ten 25 mL volumetric flasks respectively.

[0088] Table 3 potassium nitrate standard sample addition amount

[0089]

[0090] Add distilled water to each volumetric flask to dilute to 25.0 mL, shake to a constant volume, and measure the absorbance.

[0091] 3. Determination of absorbance value

[0092] With pure water as the reference solution, after measuring the baseline according to the measurement steps of Example 1, insert the flexible pipe liquid suction port of the sampling pump 10 into each standard sample respec...

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Abstract

The invention discloses an online detection device of water dissolved-out nitrogen nutrients of a chemical fertilizer. The online detection device comprises a leaching solution, a pre-treatment system and an analyzing system, wherein the leaching system is internally provided with a plurality of leaching pipes and adopts a leaching manner from bottom to top to leach a sample; outlet water of each leaching pipe of the pre-treatment system directly enters developing tanks or is automatically sampled and diluted and then enters the developing tanks; each developing tank is externally connected with a developing agent conveying pipeline to automatically develop; and the analyzing system is formed by a spectrophotometer which is provided with flowing tanks after being improved, and a recycling tank, and different wavelengths can be set according to a project to be detected of each flowing tank and rapid and alternative detection can be carried out through software control. According to the online detection device disclosed by the invention, online analysis of water dissolved-out concentration and quality is carried out on a plurality of the nitrogen nutrients in the same chemical fertilizer sample or the same nitrogen nutrient of the different chemical fertilizer samples.

Description

technical field [0001] The invention relates to the field of water quality analysis research, in particular to an online detection device for nitrogen nutrient dissolved in chemical fertilizer water. Background technique [0002] It is an indisputable fact that the utilization rate of chemical fertilizers in our country is low, which not only increases the cost of agricultural production, but also wastes a lot of agricultural resources. More importantly, the large amount of nitrogen and phosphorus lost has become a serious threat to human health and the living environment. Studies have shown that about 30%-50% of the fertilizers applied to the soil in the world enter the groundwater through soil leaching. The Lake Institute of the Chinese Academy of Sciences conducted a study on the agricultural non-point source pollution in the Taihu Lake Basin in western Zhejiang. The results show that the TN input into Taihu Lake every year The amounts of TP and TP are respectively: 4281....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33G01N21/31
Inventor 余立祥吴跃进段俊伟谢晓明张红丁维军倪晓宇姚黎明邱冠男
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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