Reagent Ammonium Hydroxide and the test for Residue After Ignition.
According to the test description, it requires us to evaporate 50 g (56 mL) and then ignite it. Due to the challenges associated with accurately weighing a volatile material like ammonium hydroxide—which can cause instability in an analytical balance—and the fact that neither the monograph nor the procedure specifies that the sample must be weighed, we believe it may be suitable to measure 56 mL of the sample using a calibrated cylinder instead.
We can then calculate the residue by converting the measured milliliters to grams based on the density of the material (50 g). I would greatly appreciate your input on this interpretation to ensure that our approach aligns with the intended procedures.
