Product 86854 is qualified for use in ion chromatography and has more stringent specifications for trace ions and impurities. The 86880 is for general use and has not been tested for sensitive applications such as chromatography. Please see the links below to review the sample Certificate of Analysis for each product:
86880 Sample Certificate of Analysis
https://www.sigmaaldrich.com/certificates/sapfs/PROD/sap/certificate_pdfs/COFA/Q14/86880-BULKBCCJ8688.pdf
86854 Sample Certificate of Analysis
https://www.sigmaaldrich.com/certificates/sapfs/PROD/sap/certificate_pdfs/COFA/Q14/86854-BULKBCCJ7431.pdf