Sample treatment method for measuring antimony in polyester chip with flame atomic absorption spectrometry

Abstract

The invention discloses a sample treatment method for measuring antimony in a polyester chip with flame atomic absorption spectrometry. The sample treatment method comprises the steps of: weighing and conducting low-temperature heating on an appropriate polyester chip sample, ashing the sample for approximately 1h after the sample is completely carburized, taking out and cooling the ashed sample to be at room temperature, adding approximately 2ml of 10% (approximately) magnesium nitrate and evaporating to dryness, putting a quartz beaker of the dried sample into a muffle furnace, setting the temperature of a furnace body to be approximately 500 DEG C, ashing for approximately 2h, taking out and cooling the beaker for placing the completely ashed sample to be at the room temperature, adding approximately 2ml of 68%-70% hydrochloric acid, moving the dissolved sample into a 50ml volumetric flask, adding deionized water to be a constant volume, and obtaining a product. In the sample treatment method, the sensitivity of the sample in the measurement by the flame atomic absorption method is improved, the precision is improved, the measuring speed is high, the interference is small, the accuracy is high, the measuring cost is low, and the sample treatment method is particularly applicable to the quality detection in polyester chip manufacturers.

Description

technical field [0001] The invention relates to element detection of chemical raw materials, in particular to a sample processing method for measuring antimony content in polyester chips by flame atomic absorption spectrometry. Background technique [0002] Polyester chip is an important raw material in the chemical fiber industry. With the continuous development of chemical technology, it is widely used in the fields of various containers, packaging materials, films, films, and engineering plastics. The application is very extensive. However, it is added during the synthesis process; a certain amount of antimony acetate is used as a catalyst, so it contains a small amount of antimony. The antimony content directly affects the luster and chroma of the product. In order to control the quality of the product, it is required to analyze and test the product to control the antimony involved in the production and improve the quality of the product. However, there are relatively...

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Problems solved by technology

[0003] Spectrophotometry: It is necessary to add a reducing agent to reduce, the acidity in the solution system is very high during the measurement, and the inappropriate auxiliary reagents in the chromogenic agent will cause unsatisfactory accuracy and repeatability of the measurement results

[0004] The atomic absorption method is also used in a small amount, but due to the influence of some metal ions and organic components in the matrix during the determination of antimony, the accuracy of the determination is seriously affected.

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