A kind of determination and analysis method of chelated zinc content in chelated potassium plus zinc urea product
A technology of chelating potassium and zinc, which is applied in the field of analytical chemical detection, can solve the problems of not meeting the control and analysis requirements of urea products, large errors in measurement results, long processing time, etc., and achieves short measurement time, high accuracy, Simple operation effect
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Embodiment 1
[0025] A method for assaying and analyzing chelated zinc content in chelated potassium plus zinc urea products, comprising the following steps:
[0026] (1) Draw a standard curve
[0027] Pipette 0, 1.0mL, 2.0mL, 3.0mL, 4.0mL, 5.0mL of 10μg / mL zinc ion standard solution into six 200mL Erlenmeyer flasks, add 1.5mL of 1+3 sulfuric acid solution, and add water until the total volume of the solution is 30mL , after mixing, boil on the electric stove for 5min, then cool to room temperature, add 0.05mL methyl orange solution, adjust to yellow with 20% sodium hydroxide solution, then adjust to red with 1+35 sulfuric acid solution, and finally use Adjust the 1mol / L sodium hydroxide solution to yellow, add 10.0mL of boric acid-potassium chloride-sodium hydroxide with a pH of 8.5-9.5 and 2.0mL of 2g / L zinc reagent, mix well, and then transfer the solution to 50mL Make constant volume in the volumetric flask, measure its absorbance at 620nm after standing for 10min, and use the sample w...
Embodiment 2
[0059] The determination and analysis method for the content of chelated zinc in the raw material Lufengyuan fertilizer synergist, the principle is: the zinc in the raw material solution is atomized in the air-acetylene flame in a slightly acidic medium, and the generated atomic vapor is absorbed from the zinc hollow The characteristic wavelength of 213.9nm light emitted by the cathode of the lamp, the absorbance is proportional to the atomic concentration of the zinc ground state.
[0060] The determination and analysis method of the chelated zinc content in the raw material Lvfengyuan fertilizer synergist comprises the following steps:
[0061] (1) Draw a standard curve
[0062] Use a pipette to pipette 0, 1.0, 2.0, 3.0, 4.0, 5.0mL 20μg / mL zinc standard solution respectively, place them in six 100mL volumetric flasks to constant volume, and use an air-acetylene flame at a wavelength of 213.9nm. Measure the absorbance of the standard solution in turn, take the zinc content (...
Embodiment 3
[0093] The assay analysis method of chelated zinc content in the chelated potassium plus zinc urea product comprises the following steps:
[0094] (1) Draw a standard curve
[0095] Use a pipette to pipette 0, 1.0, 2.0, 3.0, 4.0, 5.0mL10μg / mL zinc ion standard solution respectively, put them in six 50mL volumetric flasks to constant volume, and use an air-acetylene flame at the wavelength of 213.9nm, successively Measure the absorbance of the standard solution, take the zinc content (μg) as the abscissa, and the corresponding absorbance as the ordinate, draw a curve or obtain the curve regression equation, the results are shown in the attached image 3 .
[0096] (2) Product pretreatment
[0097] Weigh 0.5000g of chelated potassium plus zinc urea product, place it at the bottom of the Kjeldahl flask, rinse the sample on the wall of the bottle with a small amount of water, add 5.0mL of concentrated sulfuric acid after the sample is dissolved, put a small funnel with a curved ...
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