Table 1 Sensory Requirements Item Requirements Inspection Method Color: White, slightly yellow, etc. Take an appropriate amount of sample in a clean, dry white porcelain plate, and observe its color, state and impurity form under natural light. Powder or crystal, slight agglomeration is allowed. Block, easily soluble in water, no foreign impurities visible to the naked eye. 3.3 The physical and chemical indicators comply with the requirements in Table 2. Table 2 Physical and Chemical Index Item Inspection Method Alkali content (calculated as NaOH) g/100g 1±0.5 Appendix A Ether leachate g/100g 1.0-2.0 Appendix A Heavy metals (calculated as Pb), mg/kg≤ 10.0 GB5009.74 Total Arsenic (calculated as As), mg/kg≤2.0 GB5009.76 3.4 Net content deviation