... , as bleaching agent and preservative dried fruits, ect. Sodium hydrosulphiteQuality standardHG/2074-2004, JISK1476-1995, HG/T2682-1995Molecular ... used as reducing agent in chemical industry.6. Sodium hydrosulfite food additive grade is used in foodstuffs, as ... and canned mushrooms. Product specificationsINDEX90%88%85%FOOD ADDITIVENa2S2O4≥90%≥88%≥85%≥85%Fe≤20ppm≤20ppm≤20ppm≤20ppmZincZn≤1ppm≤1ppm ...