HG/T 2784-2012 Ammonium Sulfite for Industrial Use
4.2.2.4 Result Calculation
The mass fraction of ammonium bisulfite monohydrate [(NH4)2SO3·H2O], expressed as%, is calculated according to formula (1):
…………………………（1）
In the formula:
The volume of sodium thiosulfate standard titration solution (4.2.2.2.2) consumed in the blank test, measured in milliliters (ml).
—The volume of the standard sodium thiosulfate titration solution consumed, measured in milliliters (ml);
c-the precise concentration of sodium thiosulfate standard titration solution, measured in molar per liter (mol/L);
M-the molar mass of ammonium bisulfite, measured in grams per mole (g/mol) (M=134.15);
m-the numerical value of the sample mass, in grams (g);
—The mass fraction of ammonium bisulfite, as determined in Section 4.2.3, expressed as a percentage.
1.3535-The conversion factor for ammonium bisulfite (NH4HSO3) to ammonium bisulfate monohydrate [(NH4)2SO3·H2O].
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%.
