Method for measuring red phosphorus content in electronic product by photometry

An electronic product, photometric technology, applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc., can solve problems such as harm to human health, and achieve reliable methods, easy to implement, The effect of reliable implementation

Active Publication Date: 2009-07-22
谱尼测试集团深圳有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of electronic products added with red phosphorus flame retardants is harmful to human health, so the content of red phosphorus in electronic products should be limited, but at present, my country has not yet issued a detection standard for red phosphorus in electronic products

Method used

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  • Method for measuring red phosphorus content in electronic product by photometry
  • Method for measuring red phosphorus content in electronic product by photometry
  • Method for measuring red phosphorus content in electronic product by photometry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1: Detection of precision and recovery rate of red phosphorus content in plastics

[0013] Weigh 10 g of the sample pulverized by the freeze pulverizer (accurately weighed to 0.0001 g), put it into a gas generating bottle, add 100 mL of 40% sodium hydroxide solution preheated to 50 ° C, and connect the nitrogen blowing device. Introduce the generated gas into 10mL of acidic potassium permanganate solution with a concentration of 0.05mol / L, blow with nitrogen continuously for ten minutes, then transfer the absorption liquid to a 25mL stoppered colorimetric tube, add saturated sodium sulfite solution dropwise until the color of potassium permanganate After fading, add 2 more drops, add 0.3mL sulfuric acid solution, 0.2mL ammonium molybdate solution, mix well; add 1 drop of stannous chloride solution, dilute to the mark, shake well; heat in 50°C water bath for 10 minutes , take out, and cool to room temperature. Measure the absorbance at a wavelength of 680nm, and...

Embodiment 2

[0026] Embodiment 2: detection of precision and recovery rate of red phosphorus content in resin:

[0027] Take by weighing 10 g (accurately weighed to 0.0001 gram) of the sample pulverized by a freezing pulverizer, put the processed sample into a gas generating bottle, add 100 mL of concentration preheated to 50° C. in 40% sodium hydroxide solution, Connect the nitrogen blowing device, introduce the generated gas into 10mL acid potassium permanganate solution with a concentration of 0.05mol / L, blow nitrogen continuously for ten minutes, then transfer the absorption liquid to a 25mL stoppered colorimetric tube, add saturated sodium sulfite solution dropwise to high After the color of potassium manganate fades, add 2 more drops, add 0.3mL sulfuric acid solution, 0.2mL ammonium molybdate solution, and mix well; add 1 drop of stannous chloride solution, set the volume to the mark, shake well; put in a 50°C water bath Heat for 10 minutes, remove, and cool to room temperature. Mea...

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Abstract

The invention relates to a method for measuring the content of red phosphorus in electronic products by photometry. The method comprises the following steps: after test sample to be measured is crushed and mixed, strong alkaline liquor is added and has reaction to generate phosphine; after acid chameleon solution is used for absorption, the absorption liquid is transferred into a comparator with a stopper; after saturated sodium sulfite solution is dropped till the color of the chameleon is completely faded, sulphuric acid solution and ammonium molybdate solution are added and evenly mixed; a drop of stannous chloride solution is added in constant volume; the mixture is disposed in a water bath with the temperature of 50 DEG. C to heat for 10 minutes; and the mixture is taken out and cooled to room temperature. The absorbency is measured at the wavelength of 680nm, the concentration value of phosphine is read out on a specification curve, and then the content of red phosphorus in samples is calculated. The application of the method in the invention determines the content of red phosphorus in electronic products, which is quick and efficient; the relative average deviation is less than 10%; consequently, the method in the invention provides a reliable and convenient method for measuring the content of red phosphorus in electronic products, thereby being capable of meeting the requirements of research and production.

Description

technical field [0001] The invention relates to a method for measuring the content of red phosphorus in electronic products, in particular to a method for detecting the content of red phosphorus in electronic products by photometry. Background technique [0002] Red phosphorus (red phosphorus) is a simple substance of phosphorus, and it is an allotrope with white phosphorus. Red phosphorus has good flame retardant properties. It is an inorganic phosphorus flame retardant with excellent performance. It has high efficiency, smoke suppression, and low toxicity. . Phosphorous flame retardants are good substitutes when halogenated flame retardants are increasingly restricted. However, with the development of society, people's demand for green and environmental protection is gradually increasing, and they also pay more attention to their own health. The use of electronic products added with red phosphorus flame retardants is harmful to human health. Therefore, the content of re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/79
Inventor 宋薇
Owner 谱尼测试集团深圳有限公司
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