To determine whether the addition of ferric pyrophosphate complies with the standards, the following aspects can be considered:

1. Check the product label and instruction manual: Examine whether the addition amount of ferric pyrophosphate is clearly indicated on the product label. For food products, it is also necessary to check whether the content value of iron elements in the fortified food and its percentage in the Nutrient Reference Value (NRV) are marked in the nutrition facts panel.

2. Verify the scope of use and dosage limits: According to the provisions of the National Food Safety Standard - Standard for the Use of Food Nutrient Fortifiers (GB 14880), confirm whether the scope of use and the dosage of ferric pyrophosphate meet the requirements. For example, the dosage of ferric pyrophosphate in modulated milk is 10mg/kg - 20mg/kg; for modulated milk powder (excluding milk powder for children and pregnant and lactating women), it is 60mg/kg - 200mg/kg, etc.

3. Conduct laboratory tests:

·Determination of iron content: According to the method specified in the National Food Safety Standard - Food Nutrient Fortifier Ferric Pyrophosphate (GB 1903.16 - 2016), dissolve the sample with hydrochloric acid solution, reduce it with stannous chloride, then oxidize the excessive stannous chloride with mercuric chloride. Using sodium diphenylamine sulfonate as an indicator, titrate with potassium dichromate standard solution to determine the iron content. The iron content (Fe) should be between 24.0% - 26.0%.

·Detection of other indicators: It is also necessary to detect indicators such as loss on ignition, lead, arsenic, total mercury, chlorides, sulfates, etc. For example, the loss on ignition should not exceed 20.0%, the lead (Pb) content should not exceed 4.0mg/kg, and the arsenic (As) content should not exceed 3.0mg/kg, etc.

4. Review the production process and compliance: Check whether the addition of ferric pyrophosphate during the production process follows the Good Manufacturing Practice (GMP) and complies with the requirements of relevant food safety laws, regulations, and standards. At the same time, confirm whether the enterprise has the corresponding production qualifications and licenses, and whether the product has undergone formal inspection and certification procedures.

If there are doubts about whether the addition of ferric pyrophosphate in the product complies with the standards, you can consult the relevant food safety supervision departments or professional testing institutions to obtain accurate judgments and suggestions.