Item Standard Appearance White or grey yellow powder Identification + As element content < 10PPM Heavy Metal content < 30PPM Article size 98% (80MESH) pH value 8.22 Content of VC 35.84% Loss on drying 4.97% Conclusion Complying with the Standard Key Specifications Item Standard Appearance White or grey yellow powder Identification + As element content < 10PPM Heavy Metal content < 30PPM Article size 98% (80MESH) pH value 8.22 Content ...