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See Chinese contents: GB 1886.337-2021 GB 1886.337-2021: National food safety standard - Food additives - Potassium dihydrogen phosphate
This Standard is applicable to the food additive sodium tripolyphosphate produced with sodium carbonate (or sodium hydroxide) and food additive phosphoric acid (including wet-process phosphoric acid) as raw materials, or the food additive sodium tripolyphosphate produced by recrystallization with sodium tripolyphosphate as raw material.
