Method for determining boron content in rubber

A boron content, rubber technology, applied in the direction of color/spectral characteristic measurement, etc., can solve the problem that boron content has not been reported publicly, and achieve the effect of wide measurement range, good selectivity, high accuracy and precision

Active Publication Date: 2013-03-27
BEIJING RES & DESIGN INST OF RUBBER IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, there is no public report on the method of using graphite furnace

Method used

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  • Method for determining boron content in rubber
  • Method for determining boron content in rubber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The boron content of the known formula rubber sample was measured, and the measured value of the boron content was compared with the theoretical value added. The analysis results are as follows:

[0036]

Embodiment 2

[0038] Carry out standard addition recovery test to blank solution, test result is shown in the following table:

[0039] Added value (μg / mL) Measured value (μg / mL) relative standard deviation(%) Recovery rate(%) 1.000 0.998 1.95 99.8 0.500 0.516 3.90 103.0 2.000 2.025 2.46 101.2

Embodiment 3

[0041] The sample solution diluted 10 times was subjected to the standard recovery test, and the test results are shown in the following table:

[0042] Boron concentration in unspiked sample solution (μg / mL) Add B standard solution concentration (μg / mL) B concentration measured after adding standard (μg / mL) relative standard deviation(%) Recovery rate(%) 0.741 1.000 1.751 1.81 101.0 1.230 1.000 2.205 2.67 97.5 1.029 1.000 2.020 3.90 99.1

[0043] As can be seen from the test results in Examples 1, 2, and 3, the method has good accuracy and precision.

[0044] As can be seen from the above, the present invention has established a standard test method that adopts graphite furnace atomic absorption spectrometry to measure boron content in rubber. The method has wide measuring range, clear operation steps, easy to master, and high accuracy and precision of analysis results.

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Abstract

The invention discloses a method for determining boron content in rubber. The method employs a graphite furnace atomic absorption spectrometry method for determination and calculation of boron content in rubber. The method comprises steps of: conducting pretreatment on a rubber sample; conducting high-temperature ashing by a muffle furnace; adding a mixed acid of hydrofluoric acid and concentrated sulfuric acid in the ash; digesting, drying and placing the ash in the muffle furnace; calcining at 800 DEG C; dissolving the ash with hydrochloric acid to gain a transparent sample solution, and conducting a blank test with the sample; preparing a boron standard work solution above 4 point by using a boron standard stock solution; adding a matrix modifier Ca (NO3) 2 with a same concentration into the sample solution, the blank solution and the standard work solution, and adding high purity water for constant volume; optimizing test conditions of the graphite furnace atomic absorption spectrometry, measuring boron absorbance of the sample solution, the blank solution and the standard solution, and drawing a standard working curve to obtain boron concentration in the sample solution; and calculating the content (in percentage) of boron in the rubber sample. The determination method has advantages of results with high precision and accuracy.

Description

technical field [0001] The invention relates to a method for measuring boron content in rubber, in particular to a method for measuring the graphite furnace atomic absorption spectrum. The invention belongs to the technical field of rubber detection. Background technique [0002] With the continuous development of the rubber industry, rubber is widely used in high-tech fields such as aerospace and aviation, and more and more boron-containing additives are used in rubber. One of them is boron-based flame retardants, such as zinc borate, high borate calcium borate, etc. The active ingredients are boron trioxide. They are important green and environmentally friendly inorganic flame retardants, which can partially or completely replace halogen-containing flame retardants. Fuel. Zinc borate (2ZnO 3B 2 o 3 ·nH 2 O) It can be used as a multifunctional synergistic additive of antimony oxide or other halogen flame retardants, and can be used in rubber products made of various r...

Claims

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Application Information

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IPC IPC(8): G01N21/33
Inventor 岳敏李海燕李淑娟张翠翠范山鹰
Owner BEIJING RES & DESIGN INST OF RUBBER IND
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