《ISO-1573-1980.pdf》由会员分享，可在线阅读，更多相关《ISO-1573-1980.pdf（4页珍藏版）》请在三一文库上搜索。
1、International Standard INTERNATIONAL ORGANIZATION FOR STANDARDIZATIONMEWYHAPOfiHAFI OPI-AHM3AUMR fl0 CTAHAAPTbl3AL repeat these operations, if necessary, until the differente between two successive weighings does not exceed 0,005 g. If the mass of the test Portion increases after repeated heating, c
2、alculate the result from the weighing immediately before the mass started to increase. 6.5 Number of determinations Carry out two separate determinations on the same prepared test Sample (6.2). 4.2 Constant-temperature oven, capable of being con- trolled at 103 ?I 2 OC. 7 Note on drying procedure 4.
3、3 Desiccator, containing an efficient desiccant. 4.4 Analytical balance. In general, a Single 16 h period in the oven at 103 I!Z 2 OC gives equivalent results, but it is the responsibility of the analyst to tonfirm this in each particular case. 1 -,-,- ISO 1573-1980 0 8 8.1 Expression of results Met
4、hod of calculation and formula The loss in mass at 103 OC, expressed as of the Sample, is given bY the formula a percentage by mass 8.2 Repeatability The differente between the results of two determinations, carried out simultaneously or in rapid succession by the same analyst, shall not exceed 0,3
5、g per 100 g of Sample. (mo -m,) x J! m0 9 Test report m0 is the initial mass, in grams, of the test Portion; is the mass, in grams, of the dried test portion. Take as the result the arithmetic mean of the two determina- tions, provided that the requirement for repeatability (see 8.2) is satisfied. T
6、he test report shall show the method used and the result ob- tained. lt shall also mention any operating details not specified in this International Standard, or regarded as optional, as well as any circumstances that may have influenced the result. The report shall include tification of the Sample. all details required for complete iden-