Determination method of content of urea in water-based adhesive

A technology of urea content and determination method, which is applied in the field of physical and chemical inspection of water-based adhesive materials, can solve the problems of analysts’ health and environmental hazards, difficulty in purchasing reagents, and long time-consuming, etc., to achieve short detection time, easy operation, and high recovery rate. high effect

Active Publication Date: 2014-10-29
CHINA NAT TOBACCO QUALITY SUPERVISION & TEST CENT
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Problems solved by technology

[0008] The diacetyl monoxime derivatization analysis method has disadvantages such as cumbersome operation, long time-consuming, difficult procurement of special reagents required, or potential harm to analysts' health and environment, so high-performance liquid chromatography is used for detection Become a simple method for the determination of urea

Method used

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  • Determination method of content of urea in water-based adhesive
  • Determination method of content of urea in water-based adhesive
  • Determination method of content of urea in water-based adhesive

Examples

Experimental program
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Embodiment 1

[0026] The present embodiment is as follows to the assay method of urea content in water-based glue (the flow chart of described detection method is as follows figure 1 shown)

[0027] (1) Preparation of standard solution: Weigh 10mg of urea (accurate to 0.1mg), dissolve it with ultrapure water and transfer it to a 100mL volumetric flask, set the volume to the mark and shake well, as the primary mother solution; take 1mL of the primary mother solution to In a 50mL volumetric flask, dilute to the mark with ultrapure water, as the secondary mother liquor; store at 2°C-8°C, valid for 1 month. Accurately pipette 10 μL, 50 μL, 100 μL, 200 μL, 500 μL and 1000 μL of the secondary mother liquor into 10 mL volumetric flasks, and dilute to the mark with ammonium dihydrogen phosphate solution to obtain a series of standard working solutions, which are prepared and used immediately.

[0028] (2) Preparation of sample solution: Weigh 1.0g sample into a 50mL Erlenmeyer flask, add 25mL ultr...

Embodiment 2

[0042] The present embodiment is as follows to the detection method of the repeatability of the inventive method and the standard addition recovery rate

[0043] Adopt the sample standard addition recovery rate test, add the standard solution of three different concentrations of low, medium and high respectively in the sample and carry out standard addition rate test, each sample measures 5 times respectively, the condition of chromatographic analysis is the same as embodiment 1, calculates according to analysis result The standard addition recovery of urea in the water-based glue of this method and the relative standard deviation of measured value after the standard addition, the results are shown in table 2;

[0044]

[0045] As can be seen from Table 2, on the 3 levels of standard addition, the average recovery rate of urea in the water-based glue detected by this method is 92.01%, and the average relative standard deviation of the sample test results is 0.33%, indicating...

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Abstract

The invention relates to a determination method of the content of urea in water-based adhesive. The determination method of the content of urea in water-based adhesive comprises the following steps: preparing a sample solution, analyzing by liquid chromatogram, calculating the determination result and the like. A detection method after optimization has the advantages of short detection time, simplicity and convenience in operation, high flexibility, high recovery rate, good repeatability and the like. The chromatographic condition of the method provided by the invention enables the separation of the chromatographic peak of urea and the chromatographic peak of impurities to be favorable, and has good relevancy. The detection limit is 2.34 micrograms/g; the average recovery rate is 92.01%; the average relative standard deviation of the sample testing result is 0.33%.

Description

technical field [0001] The invention relates to a method for measuring urea content in water-based glue, and belongs to the technical field of physical and chemical inspection of water-based glue materials. Background technique [0002] Urea is also known as carbonamide, carbonamide, and urea. An organic compound composed of carbon, nitrogen, oxygen and hydrogen. Its chemical formula is CON2H4, CO(NH2)2 or CN2H4O, and its international non-proprietary drug name is Carbamide. Appearance is white crystal or powder. Urea is synthesized in the liver and is a nitrogenous metabolite excreted by mammals. This metabolic process is called the urea cycle. Urea is the first organic compound obtained by artificially synthesizing inorganic substances. Chemical formula: CO(NH 2 ) 2 , Molecular mass 60.06, colorless or white needle or rod crystals, industrial or agricultural products are white slightly reddish solid particles, odorless and tasteless. The nitrogen content is about 4...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02
Inventor 张洪非刘珊珊范子彦唐纲岭边照阳李中皓杨飞王颖张艳革
Owner CHINA NAT TOBACCO QUALITY SUPERVISION & TEST CENT
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