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Sample Preparation - Dissolution of silicon in metals

 
We're having difficulty analyzing Si when the concentration is above 1% using ICP. Can you recommend dissolution techniques for Si concentrations above 1% in metals, specifically without the use of HF?
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Unfortunately, there is no way to dissolve more than 1% Si in metals without adding HF.  In your case there is a need for acids to bring about solution of the alloy metals. Otherwise you could use an oxidative fusion such as sodium peroxide. The use of an HF resistant introduction system should be considered since putting HF through a glass system will, at best, give significant Si signals above that from the sample.For pure Si, the mixture that works well is 1:1:1 water/HF/nitric. So long as your acid mix includes some water and HF, you should have no difficulty dissolving elemental Si.

Posted: 09/07/18 02:58:25

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