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
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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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