Sodium metabisulfite turns yellow
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Dear experts, how can I solve the problem of sodium metabisulfite turning yellow?
It is normal for sodium metabisulfite to turn yellow when exposed to air, especially if it absorbs moisture. Because during the preparation process, it takes on a light yellow color due to the raw materials and the handling methods used. If you want to prevent it from oxidizing and deteriorating as much as possible, you can fill the packaging with nitrogen to slow down the oxidation process.
Is it necessary to add a nitrogen seal valve? That might solve the problem. If you need fiberglass equipment, feel free to contact us at any time. :)
Sodium metabisulfite has many useful applications
If it is an analytical-grade reagent, there should be no issue with high iron content. There is a high possibility of oxidation due to factors such as moisture. As for whether this yellow color is caused by iron or sulfur, it’s hard to say; even trace amounts of trivalent iron can cause a significant change in appearance.
Yes, it will turn yellow if it absorbs moisture