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HG/T 2784-2012 Ammonium Sulfite for Industrial UseJan 14,2026
In the sample, ammonium bisulfite is oxidized to ammonium bisulfate by hydrogen peroxide. Then, using methyl red-indigo mixed solution as an indicator, titration is performed with sodium hydroxide standard titration solution until the solution turns yellow-green, which marks the endpoint. The mass fraction of ammonium bisulfite is calculated based on the consumption of sodium hydroxide standard titration solution.
HG/T 2784-2012 Ammonium Sulfite for Industrial UseDec 31,2025
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%.
HG/T 2784-2012 Ammonium Sulfite for Industrial UseDec 29,2025
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.
HG/T 2784-2012 Ammonium Sulfite for Industrial UseDec 26,2025
Solid ammonium sulfite should meet the requirements of Table 1.
HG/T 2784-2012 Ammonium Sulfite for Industrial UseDec 24,2025
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 UseOct 29,2025
HG/T 2784-2012 Ammonium Sulfite for Industrial Use