ASTM D4902-99 (2020) pdf free.Standard Test Method for Evaporation and Drying of Analytical Solutions.
This test method covers a procedure for the evaporatingand drying of the 100 mL portions of analytical solutionobtained in the methods for vegetable tannin analysis， so thatconsistent results may be obtained for the determination oftotal solids, soluble solids, and non-tannins in the sample.Thistest method is also intended for use in determining the moisturein the hide powder samples and the moisture in raw and spentmaterials in the methods for vegetable tannin analysis.
The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.
This standard does not purport to address all of thesafety concerns，if any,associated with its use. It is theresponsibility of the user of this standard to establish appropriate safety，health,and environmental practices and determine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accordance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards，Guides and Recommendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.
This test method describes a procedure for evaporationand drying of the 100 mL portions of the analytical solutionobtained in Test Methods D4903,D6401,and D6402,so thatconsistent results may be obtained for the determination oftotal solids， soluble solids, and non-tannins in the sample.Thistest method is also intended for use in determining the moisturein the air-dry and prepared，wet,hide powders used in TestMethod D6401, and the moisture in raw and spent materials inTest Method D6403.This test method is useful for determining the solidresidue in analytical solutions.
Because of the possibility of unknown errors in this testmethod, it is essential that the procedure be followed exactly inorder to obtain reproducible results，both among specimenswithin a laboratory and for analyses between laboratories.
When drying is complete,remove the dishes from theoven，place in desiccators,cool to room temperature,andweigh to the nearest 0.1 mg.ASTM D4902 pdf download.