sodium metabisulfite

Certificate of A nalysis of Industrical Grade Industrical grade Standard Results Content ( as Na 2 S2O 5 ) %≥ 96.5 97. 2 Phase White or light yellow crystalline powder White or light yellow crystalline powder Appearance of solution - Colorless and transparent Nacl %≤ - 0.02 Iron ( as Fe ) ％≤ 0.005 0.0009 Arsenic ( as As ) %≤ 0.0001 0.0001 Heavy metal（as Pb）% ≤ 0.0005 0.0005 PH Value 4.0-4.6 4.48 Water Insoluble %≤ 0.05 0.03