Test Items

Appearance

Main content (calculated as (NH4) 2S2O3),%

Alkalinity (calculated as NH4OH),%

Sulfite (calculated as (NH4) 2SO3),%

Density (20 ℃)

PH value (20 ℃)

testing indicators

Colorless, transparent, and free of impurities

53-61

0.3-1.5

≤1

1.284-1.340

/

Test Results

Colorless, transparent, and free of impurities

57.57

0.35

0.28

1.317

8.7