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Specification                         Tolerance                            Result

Purity(wt%)                        88min                                  88.6

Na₂CO₃(wt%)                      2-3.5                                      2.20

Na₂S₂O₃(wt%)                     0.5-1.5                                   1.10

Na₂S₂O₅(wt%)                      5.5-6.5                                 5.75 

Na₂SO₃(wt%)                      1.5-2.5                              2.03 

Fe(ppm)                            15max                                  10

Water insoluble(wt%)        0.1max                  0.05

Smell:       a little SO₂  of smell