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Remove tin from gold (1 reply and 1 comment)
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Hello. I have approx 20oz of gold that I have inquarted with copper and digested with nitric acid, 2/3 water, 1/3 nitric. I have washed, dried and analyzed it using an Olympus XRF.My problem is the presence of tin which I have read cannot be removed by nitric. I have previously done the same inquartation procedure on a smaller amount of scrap jewellery gold, which worked well and gave me an xrf reading of 100% gold + or - .5%, it did not contain tin. I understand that I may be able to use hcl to remove the tin? Any advice or opinion on this would be most welcome and also tips for washing the gold after the acid digestion, i.e wash with hot or cold water, distilled or not, I understand chlorine can cause an issue. How long should I let the acid do its thing? etc. Please pardon my inexperience