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Method for determining content of arsenic pentoxide and arsenic trioxide

A technology for arsenic pentoxide and arsenic trioxide, which is applied in the field of separate determination of the content of arsenic pentoxide and arsenic trioxide, can solve the problem of lack of accurate quantification of arsenic trioxide and the like, and achieve the effect of a fast and accurate detection method and high selectivity

Inactive Publication Date: 2012-12-19
GUANGZHOU PONY TESTING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no good method that can accurately quantify diarsenic pentoxide and diarsenic trioxide in the sample respectively.

Method used

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  • Method for determining content of arsenic pentoxide and arsenic trioxide
  • Method for determining content of arsenic pentoxide and arsenic trioxide
  • Method for determining content of arsenic pentoxide and arsenic trioxide

Examples

Experimental program
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Effect test

Embodiment 1

[0017] In this embodiment, diarsenic pentoxide and diarsenic trioxide in plastic samples are determined.

[0018] Take an appropriate amount of sample and place it in a freezer pulverizer to pulverize and mix well. Weigh two 0.5g samples, add 10mL absolute ethanol to one sample and shake at room temperature to extract for 60min, then filter, wave the filtrate on the electric heating plate until nearly dry, add 8mL nitric acid and 2mL perchloric acid to digest on the electric heating plate, After the digestion is complete, dilute to 50 mL with deionized water. Add 10mL of sulfuric acid to the other sample and heat it on the electric heating plate to make it carbonized. After the white smoke is exhausted, slowly add 5mL hydrogen peroxide after cooling. After the reaction is stable, heat it on the electric heating plate. Make up to 50mL.

[0019] The content of arsenic in the two solutions was determined by inductively coupled plasma atomic emission spectrometer. The arsenic m...

Embodiment 2

[0026] Carry out with reference to Example 1, the difference is that the sample is leather, two parts of 1g samples are weighed, one part is added with 20mL ethanol for extraction, the extract is digested with acid, the other part is added with 10mL nitric acid and 2mL perchloric acid for digestion, two parts All samples after complete digestion were adjusted to 50 mL.

[0027] Table 3 Relevant data for the determination of arsenic pentoxide and arsenic trioxide in this example

[0028]

[0029] Obviously, those skilled in the art can use the present invention to measure the content of diarsenic pentoxide and diarsenic trioxide in electronic products respectively.

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Abstract

The invention relates to a method for determining content of arsenic pentoxide and arsenic trioxide. The method comprises crushing to-be-detected samples, extracting and separating the arsenic pentoxide in the samples in accordance with dissolvable differences of the arsenic pentoxide and the arsenic trioxide in ethanol, digesting the extract with acid, determining arsenic of the arsenic pentoxide with an inductively coupled plasma atomic emission spectrometer, determining total arsenic content with a wet digestion method, getting arsenic content of the arsenic trioxide by calculating difference between the total arsenic content and the arsenic content of the arsenic pentoxide, and obtaining contents of the arsenic pentoxide and the arsenic trioxide in the samples according to molecular weight conversion. The method is rapid and effective, and relatively high in selectivity. The invention provides a reliable and conveniently implemented method for respective determination of the content of the arsenic pentoxide and the arsenic trioxide.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical analysis, in particular, the invention relates to a method for separately measuring the content of diarsenic pentoxide and diarsenic trioxide. Background technique [0002] Arsenic trioxide, commonly known as arsenic, is the most commercially valuable arsenic compound and the main starting material for arsenic chemistry. It is also one of the oldest poisons; arsenic pentoxide is unstable to heat, and at its melting point (300°C), it loses oxygen and becomes arsenic trioxide , which is a strong oxidizing agent and less toxic than arsenic trioxide. These two arsenic oxides are used in the glass industry, leather industry, agriculture, paint and pigment industries, etc., but these two arsenic oxides are highly toxic chemicals. On October 28, 2008, these two compounds were included in the first batch of Substances of Very High Concern (SVHC) catalog under the REACH regulation launched by t...

Claims

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Application Information

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IPC IPC(8): G01N21/73G01N1/28
Inventor 宋薇
Owner GUANGZHOU PONY TESTING TECH
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