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Sodium sulphite
Name
Premium grade
First grade
Second grade
Sodium sulphite %≥
97
96
93
Fe %≤
0.003
0.005
0.01
Water insoluble matter %
0.02
0.03
0.05
Free alkali %≤
0.1
0.4
0.6
Sulfate radical %≤
2.5
-
-
Sodium chloride %≤
0.1
-
-

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