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How is the 1-2-4 sulfonic acid in GB12149-2017 prepared?

2018-11-13View Original

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In the 2007 version, 1-2-4 sulfonic acid was represented by sodium sulfite and sodium bisulfite, but in the 2017 version it’s all represented by sodium sulfite. What’s going on? I can’t prepare it
Reply #22018-11-24
We purchased it directly as 1.2.4 sulfonic acid, analytical grade

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