GB/T 9741-2008 English PDF (GBT9741-2008)

This Standard specifies a general method for the gravimetric determination of ignition residue. This Standard is applicable to the determination of the burning residue of chemical reagents that can be sublimated or carbonized and can be removed at 650¡æ¡À50¡æ. When using this standard to measure ignition residue, the mass of the residue calculated based on the sampling amount and specification value shall not be less than 1 mg. 2 Method principle Utilizing the differences in physical and chemical properties such as volatility, stability to heat, and oxygen between the sample body and the substances that form the residue, the sample is heated at low temperatures to volatilize, carbonize, and burn at high temperatures to completely separate the sample body from the residue. The mass of the residue can be weighed using a scale. 3 Instruments 3.1 General laboratory instruments. 3.2 Crucible or evaporating dish: depending on the nature of the sample, the material can be platinum, quartz or ceramic. 3.3 High temperature furnace: the temperature can be maintained at 650¡æ¡À50¡æ. 3.4 Analytical balance: graduation value is 0.1 mg. 4 Determination 4.1 Precautions for determination When volatilizing or carbonizing a sample, if