Product Knowledge Article

The arithmetic mean of the two parallel test results shall be taken as the test result. The absolute difference between the two parallel test results shall not exceed 0.40%.

In neutral or weakly acidic solutions, iodine oxidizes ammonium sulfite and ammonium bisulfite in the test solution to ammonium sulfate and ammonium bisulfate, respectively. A starch solution is then used as an indicator.

Solid ammonium sulfite should meet the requirements of Table 1.

Warning—Some reagents used in this standard are toxic or corrosive, and certain operations carry hazards. This standard does not disclose all potential safety issues. Users must strictly adhere to the relevant regulations for proper operation and are responsible for implementing appropriate safety and health measures.

HG/T 2784-2012 Ammonium Sulfite for Industrial Use