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See Chinese contents: GB 5009.256-2016 GB 5009.256-2016: National Standard of Food Safety -- Determination of Phosphates in Foods
This Standard specifies the determination of phosphates in foods. This Standard is applicable to the determination of phosphate, pyrophosphate, hexametaphosphate, trimetaphosphate, and tripolyphosphate in foods. The specimen sampling shall adopt the corresponding method to extract and purify; take the potassium hydroxide solution as the eluent; separated by anion exchange column and detected by conductivity detector. Qualitative with retention time, and quantified by external standard method.
