Method for measuring content of iminodisuccinate in compound urea

A technology of iminodisuccinate and iminodisuccinic acid, which is applied in the field of chemical analysis, can solve the problems of expensive equipment, complicated and time-consuming determination steps, and achieve the effect of less equipment, simple, fast, accurate and simple determination steps

Active Publication Date: 2018-03-09
HEBEI XIETONG ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

NMR is often used to determine the structure and composition of substances, but the

Method used

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  • Method for measuring content of iminodisuccinate in compound urea
  • Method for measuring content of iminodisuccinate in compound urea
  • Method for measuring content of iminodisuccinate in compound urea

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Embodiment 1

[0046] A. Weigh 0.72g (accurate to 0.0002g) Na 2 B 4 o 7 ﹒ 10H 2 0, add 1000ml water to be mixed with the buffer solution that concentration is 0.00072g / ml and adjust pH to 8.0 with dilute hydrochloric acid; Take compound urea (pigment is lemon yellow, iminodisuccinate is zinc iminodisuccinate and add known amount) and 20g (accurate to 0.0002g) of urea, respectively add an appropriate amount of buffer solution to dissolve, transfer to a 100ml volumetric flask, add buffer solution to constant volume, and make a compound urea solution and urea solution with a concentration of 0.2g / ml , keep the temperature in the water bath at 30°C for 20min. Take an appropriate amount of compound urea solution, urea solution and buffer solution, measure the absorbance value at 260nm wavelength with an ultraviolet spectrophotometer, repeat the measurement 6 times, and record it as S 复 , S 尿 with S 空 , the specific results are shown in the table below, where the "actual addition amount" is...

Embodiment 2

[0067] A. Weigh 0.80g (accurate to 0.0002g) of Na 2 B 4 o 7 ﹒ 10H 2 0, add 1000ml water to be mixed with the buffer solution that concentration is 0.00080g / ml and adjust pH to 8.0 with dilute hydrochloric acid; Take compound urea (pigment is lemon yellow, iminodisuccinate is manganese iminodisuccinate and add known amount) and 10 g (accurate to 0.0002 g) of urea, respectively add an appropriate amount of buffer solution of pH=8.0 to dissolve, transfer to a 100 ml volumetric flask, add buffer solution to constant volume, and prepare compound urea with a concentration of 0.1 g / ml The solution and the urea solution were kept in a water bath at 10°C for 30 minutes. Take an appropriate amount of compound urea solution, urea solution and buffer solution, and measure the absorbance value at 280nm wavelength with an ultraviolet spectrophotometer, which are recorded as S 复 , S 尿 with S 空 , the specific results are shown in the table below, where the "actual addition amount" is t...

Embodiment 3

[0089] A. Weigh 0.76g (accurate to 0.0002g) of Na 2 B 4 o 7 ﹒ 10H 2 0, add 1000ml water and be mixed with concentration and be 0.00076g / ml and adjust pH to 8.0 buffer solution with dilute hydrochloric acid; Take compound urea (pigment is tartrazine, iminodisuccinate is magnesium iminodisuccinate) and Each 30g of urea (accurate to 0.0002g) was dissolved by adding an appropriate amount of buffer solution with pH=8.0 respectively, transferred to a 100ml volumetric flask, added buffer solution to constant volume, and prepared a compound urea solution and a urea solution with a concentration of 0.3g / ml. Keep the temperature in a water bath at 50°C for 10 minutes. Take an appropriate amount of compound urea solution, urea solution and buffer solution, and measure the absorbance value at 240nm wavelength with an ultraviolet spectrophotometer, which are recorded as S 复 , S 尿 with S 空 , the specific results are shown in the table below, where the "actual addition amount" is the ...

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Abstract

The invention discloses a method for measuring the content of iminodisuccinate in compound urea, and belongs to the technical field of chemical analysis. The method comprises the following steps: measuring total absorbance value S (compound) of a compound urea solution under the wavelength of 240-280, an absorbance value S (urea) and S (pigment) of urea and pigment in the compound urea solution and an absorbance value S (blank) of blank control at first, wherein the absorbance value S (iminodisuccinate) of the iminodisuccinate equals to S (compound)-S (urea)-S (pigment)-S (blank); and then acquiring the content of the iminodisuccinate in the compound urea solution according to a standard curve of an iminodisuccinate solution under the wavelength of 240-280 nm. By the method, influence to the iminodisuccinate in a pigment and urea measuring process sis eliminated effectively, and the problem that the addition amount of the iminodisuccinate in the compound urea is difficultly detected after a finished product is obtained; and in a measuring process, required equipment is less, the cost is low, and measurement steps are simple, rapid and accurate.

Description

technical field [0001] The invention relates to a method for determining the content of a specific component in a chemical composition, especially the content of iminodisuccinate in compound urea, and belongs to the technical field of chemical analysis. Background technique [0002] Compound urea is a mixture of urea, iminodisuccinate and pigment. Urea is a high-concentration nitrogen fertilizer, which is a neutral quick-acting fertilizer. It can be used as a basic fertilizer for the production of various compound fertilizers. In compound urea, urea accounts for more than 95% of the total mass. Iminodisuccinate is an environmentally friendly chelating agent with strong water solubility and dissociates into iminodisuccinate in water. Iminodisuccinate has a strong chelating effect on copper, zinc, manganese, magnesium and other trace elements. Together, adding a small amount of iminodisuccinate to urea can supplement the trace elements needed by plants. Chinese patent CN1045...

Claims

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Application Information

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IPC IPC(8): G01N21/33
CPCG01N21/33
Inventor 唐量李文曦
Owner HEBEI XIETONG ENVIRONMENTAL PROTECTION TECH CO LTD
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