ICP-OES Analysis for Silicone Rubber

Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES) is a precise analytical technique for detecting and quantifying trace elements in materials like silicone rubber. This report covers the use of ICP-OES to analyze silicone rubber, ensuring compliance with safety standards such as EN 71-3:2019 and California Proposition 65.

Principle of Operation: ICP-OES Analysis

ICP-OES works by ionizing the sample with plasma and measuring the emitted light at specific wavelengths. The light’s intensity indicates the concentration of elements in the sample.

Sample Preparation

Silicone rubber samples are prepared and digested with acids to dissolve the matrix. These digested samples are then analyzed using ICP-OES.

Sample Preparation

Elements typically analyzed in silicone rubber with ICP-OES include:
  • Aluminum (Al)
  • Antimony (Sb)
  • Arsenic (As)
  • Barium (Ba)
  • Boron (B)
  • Cadmium (Cd)
  • Chromium (Cr)
  • Cobalt (Co)
  • Copper (Cu)
  • Lead (Pb)
  • Manganese (Mn)
  • Mercury (Hg)
  • Nickel (Ni)
  • Selenium (Se)
  • Strontium (Sr)
  • Tin (Sn)
  • Zinc (Zn)

Standards and Limits

The analysis follows standards like EN 71-3:2019 for toy safety and California Proposition 65 for consumer product safety. These standards set maximum allowable limits for various elements.

ICP-OES Analysis Example Results

Below are summarized ICP-OES results for compliance with EN 71-3:2019:
Element TestedResult (mg/kg)MDL (mg/kg)Limit (mg/kg)
Aluminum (Al)N.D.5070000
Antimony (Sb)N.D.50560
Arsenic (As)N.D.5047
Barium (Ba)N.D.0.218750
Boron (B)N.D.0.00215000
Cadmium (Cd)N.D.5017
Chromium (III)N.D.5460
Chromium (VI)N.D.90.053
Cobalt (Co)N.D.2130
Copper (Cu)N.D.0.057700
Lead (Pb)N.D.5023
Manganese (Mn)N.D.5015000
Mercury (Hg)N.D.5094
Nickel (Ni)N.D.50930
Selenium (Se)N.D.50460
Strontium (Sr)N.D.5056000
Tin (Sn)N.D.50180000
Zinc (Zn)N.D.5046000

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