Increase of constant weight rates of weighing bottles and evaporating dishes in a pharmacological experiment

Abstract

Improving the constant weight rates of weighing bottles and evaporation dishes is beneficial to drug quality control. When different quantities of weighing bottles were dried under the same conditions, the greater the quantity is, the lower the constant weight rate will be. When quantities are controlled to be the same, weighing bottles that have been cooled for 50 minutes have higher constant weight rates than those cooled for half an hour. Without being affected by other factors, weighing bottles? constant weight rates are higher when the bottles are dried at the temperature of 180?C than 105?C. The rate increases when the bottled are dried for 8 hours instead of 5 hours. After soaking for 48 hours in the solution of 2% HNO3 + 6% HCl, the weighing bottles and evaporating dishes gain higher constant weight rates. Being more efficient, faster, economical and practical, this experiment has improved the method to increase constant weight rates of weighing bottles and evaporating dishes, without the need of auxiliary equipment, and thus increased the accuracy of drug weighing results.