ASTM D4902-99(R2020) pdf free download
ASTM D4902-99(R2020) pdf free download.Standard Test Method for Evaporation and Drying of Analytical Solutions
1. Scope
1.1 This test method covers a procedure for the evaporating and drying of the 100 mL portions of analytical solution obtained in the methods for vegetable tannin analysis, so that consistent results may be obtained for the determination of total solids, soluble solids, and non-tannins in the sample. This test method is also intended for use in determining the moisture in the hide powder samples and the moisture in raw and spent materials in the methods for vegetable tannin analysis. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.4 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards: 2 D4903 Test Method for Total Solids and Water in Vegetable Tanning Material Extracts D6401 Test Method for Determining Non-Tannins and Tan- nin in Extracts of Vegetable Tanning Materials D6402 Test Method for Determining Soluble Solids and Insolubles in Extracts of Vegetable Tanning Materials D6403 Test Method for Determining Moisture in Raw and Spent Materials 2.2 ALCA Methods: A13 Evaporation and Drying of Analytical Solutions
3. Summary of Test Method
3.1 This test method describes a procedure for evaporation and drying of the 100 mL portions of the analytical solution obtained in Test Methods D4903, D6401, and D6402, so that consistent results may be obtained for the determination of total solids, soluble solids, and non-tannins in the sample. This test method is also intended for use in determining the moisture in the air-dry and prepared, wet, hide powders used in Test Method D6401, and the moisture in raw and spent materials in Test Method D6403.
4. Significance and Use
4.1 This test method is useful for determining the solid residue in analytical solutions. 4.2 Because of the possibility of unknown errors in this test method, it is essential that the procedure be followed exactly in order to obtain reproducible results, both among specimens within a laboratory and for analyses between laboratories.
5. Apparatus
5.1 Drying Oven—Forced-air convection oven (or mechanical-convection draft oven) capable of maintaining a temperature of 100° 6 2.0°C. 5.2 Thermometer—Accurate to 6 0.2°C, should be used to check and monitor the oven set point. 5.3 Desiccators and Desiccant: 5.3.1 The desiccators used can be ofany convenient form or size, but should be at least 4 in. in diameter for a single tannin dish. 5.3.2 Any normal desiccating agent such as calcium sulfate, calcium chloride, or silica gel may be used.
6. Procedure
6.1 The thermometer having been checked and the oven properly regulated, place the tared evaporating dishes contain- ing the aliquots of solution, or of hide powder, or of raw or spent tanning materials, to be dried in the oven and allow to remain there for 17 6 1 h. 6.2 When drying is complete, remove the dishes from the oven, place in desiccators, cool to room temperature, and weigh to the nearest 0.1 mg.
