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Method for quantitative analysis of metal element contained in resin material

A resin material and metal element technology, applied in the field of quantitative analysis of metal elements, can solve the problems of Pb or Cd loss, lower analysis accuracy, and inaccurate measurement values, etc.

Inactive Publication Date: 2008-02-13
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In other words, a loss of lead occurs, resulting in inaccurate measurements
[0009] (3) In the ashing method using a platinum crucible, Pb or Cd is easily lost due to rapid heating, thereby reducing the accuracy of analysis
Therefore, isotopic interferences (influence of platinum oxides such as 206PtO and 208PtO on the production of lead isotopes 206Pb, 208Pb) occur during the measurement phase by inductively coupled plasma mass spectrometry (ICP-MS), which consequently reduces the precision of the analysis

Method used

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  • Method for quantitative analysis of metal element contained in resin material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] European polyethylene standard substances (BCR-680, BCR681) were prepared as samples, and the measured values ​​thereof were guaranteed values.

[0052] A 0.2 gram sample was contained in a cylindrical container having a bottom composed of glassy carbon having a center line average roughness Ra of 1 micron on the inner surface. The centerline average roughness Ra was measured using "Talysurf 5" (trade name of a surface roughness meter manufactured by Taylor Hobson Inc.). Then, 5 ml of aqueous nitric acid solution having a concentration of 30% by weight and 5 ml of aqueous sulfuric acid solution having a concentration of 30% by weight were charged into the container, and then the container was placed on a hot plate, and the container was heated at 150° C. to decompose the sample (by Standard substance made of polyethylene). In addition, a container made of glassy carbon was fixed inside a muffle furnace, and the sample was carbonized at 450 °C to remove sulfuric acid, n...

Embodiment 2

[0064] Three cylindrical containers each having a bottom and made of glassy carbon were prepared. The centerline average roughness (Ra) of the glassy carbon on the inner surface of these containers was different from each other. Specifically, the centerline average roughness (Ra) of the glassy carbon on the inner surface measured by a surface roughness meter "Talysurf5" manufactured by Taylor Hobson Inc. was 1,000 micrometers, 100 micrometers or 10 micrometers. The container has an inner diameter of 70 mm and a height of 80 mm. Then, 10 ml of an aqueous sulfuric acid solution having a concentration of 30% by weight was charged into each of these containers. In addition, these containers were each placed in a muffle furnace and gradually heated to 400°C, 450°C, 500°C, 550°C, and then to 600°C, thereby measuring the inner surface of the container at each heating temperature using the above-mentioned surface roughness meter The average surface roughness Ra on the median line. ...

Embodiment 3 and comparative example 3

[0069] Using the same standard sample (BCR-680) as used in Example 1, a sample solution was prepared by a method similar to Example 1 and Comparative Example 2, and the isotope of lead was quantitatively analyzed. Figure 1 shows the results.

[0070] As is clear from FIG. 1 , in Comparative Example 3 using a platinum crucible, the detection of 206Pb and 208Pd was greatly hindered by platinum compared to Example 3 using a container made of glassy carbon.

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Abstract

Disclosed is a method for the quantitative analysis of a metal element contained in a resin material, which permits quantitatively analyzing the harmful substance such as lead contained in a resin material, comprising decomposing the resin material within a container having at least the inner surface formed of a glassy carbon in the presence of an aqueous solution of an oxidizing acid, heating the organic residue of the decomposed resin material so as to convert the residue into an ash, and quantitatively measuring the metal element contained in the organic residue converted into the ash.

Description

technical field [0001] The present invention relates to a method for quantitative analysis of metal elements (such as lead) contained in resin materials. Background technique [0002] In recent years, regulations focusing on the harmful properties of chemical substances have been implemented around the world. In the European Union, the Restriction of Hazardous Substances (RoHS) regulation for restricting the use of specific substances was implemented in 2006, thus clearly stipulating that six hazardous substances, including lead (Pb) and cadmium, must not be contained in any electrical or electronic device (Cd). Manufacturers and businesses exporting electrical and electronic components to Europe must comply with these legal obligations. Under such circumstances, it is a solemn responsibility for enterprises to accurately grasp the amount of harmful substances contained in electrical appliances and electronic devices and to prove that electrical appliances and electronic d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/44G01N31/00G01N31/12
CPCG01N33/442G01N31/005Y10T436/25875Y10T436/25125Y10T436/24
Inventor 竹中美由起
Owner KK TOSHIBA
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