Sodium sulphite with the specifications of 99, 98, 97, 96 and 93%
Sodium sulphite (Na<sub>2</sub>SO<sub>3</sub>), >97.0, 96.0, 93.0 and 90.0%
Fe: <0.003, 0.005 and 0.001/0%
Water insoluble matter: <0.02, 0.03 and 0.05/0%
Free alkali (as Na<sub>2</sub>SO<sub>3</sub>): < 0.10, 0.40 and 0.60/0%
Na<sub>2</sub>SO<sub>4</sub>: <2.50%
NaCL: <0.10%
Sodium sulphite (Na<sub>2</sub>SO<sub>3</sub>), >97.0, 96.0, 93.0 and 90.0%
Fe: <0.003, 0.005 and 0.001/0%
Water insoluble matter: <0.02, 0.03 and 0.05/0%
Free alkali (as Na<sub>2</sub>SO<sub>3</sub>): < 0.10, 0.40 and 0.60/0%
Na<sub>2</sub>SO<sub>4</sub>: <2.50%
NaCL: <0.10%