Sample Preparation - Quantifying silicon in silicone oil by ICP-OES
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admin
Total posts: 529
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If you perform a KOH digestion the details are as follows: use a clean LDPE bottle (HDPE has some Si) and mix the sample with the alcoholic KOH, where the KOH concentration in alcohol (ethanol or methanol) should be 0.5 - 1 M. Mix equal portions of the sample and alcoholic KOH and the temperature of digestion should be 60 degrees C (using a water bath is a good idea). Dilute the samples (and standards) in xylene or 2-butoxyethanol for the ICP-OES analysis. |
admin
Total posts: 529
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Our experience with silicone oils is primarily with direct analysis after pretreating the sample with alcoholic KOH to destroy volatile oligomers. I believe that your digestion procedure can be performed using your first approach but should incorporate a closed vessel digestion. I would like to suggest that you contact the microwave manufacturer concerning the possibility of using sulfuric and peroxide or the issue with your current method. |