Natural water contains yin sorghum and yang sorghum impurities, and the total weight of yin sorghum and yang sorghum can be measured through testing (expressed in mg/L), but the full analysis of water quality is more complicated, so the determination of evaporation residue can only be Its approximate value, because at a certain temperature, the moisture and crystal water of many substances cannot be completely removed; some substances have been decomposed at this temperature; The determination method is as follows:
(1) Clean, dry, and weigh the 100-200mL evaporating dish (weigh with a precision balance),
(2) Take 50mL of the sample and pour it into a weighed evaporating dish , evaporate to dryness on the sand bath (be careful not to mix with dust),
(3) After evaporating to dryness, bake in an oven at 100~120°C for 30 minutes.
(4) Take it out after baking, put it in a desiccator to cool to room temperature,
(5) Weigh after cooling,
The result calculation formula is
