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Sample Preparation - Struggling with Analyte recory and accuracy for Primary lead impurities by ICP-OES

 
I am currently trying to develop a method for determining impurities in primary lead and recycled secondary lead. I have been struggling to get good recovery for my elements the current method of digestion used involves using Nitric Acid, perchloric acid and precipitating out of lead using hydrochoric Acid. I used a CRM as a sample and i was not getting the expected concentrations for my Elements. I dont
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