ISO-9035-1989.pdf
《ISO-9035-1989.pdf》由会员分享,可在线阅读,更多相关《ISO-9035-1989.pdf(10页珍藏版)》请在三一文库上搜索。
1、INTERNATIONAL STANDARD ISC9 9035 First edition 198308-15 Iron ores - Determination of acid-soluble iron(H) content - Titrimetric method Minerais de fer - Dosage du ferilll soluble dans Sacide - M m is the mass, in grams, of the predried sample; 0,593 5 is a multiple of the atomic mass of iron. 8;2 G
2、ener,ai treatment of results 8,Z.l Repeatability and permissible tolerance The precision of this analytical method is expressed by the following regression equationsl): r is the permissible tolerance within a laboratory (repeatability); P is the permissible tolerance between laboratories; or is the
3、within-laboratory standard deviation; crL is the between-laboratories standard deviation. 8.2.2 Acceptance of analytical values The result obtained for the certified reference material shall be such that the difference between this result and -the certified value of the certified reference material
4、is statistically insignifi- cant. For a certified reference material that has been analysed by at least 10 laboratories using method(s) that are comparable both in accuracy and precision with this method, the following condition may be used to test the significance of the dif- ference : pl,-A12 . .
5、. (6) where A, is the certified value; A is the result or the mean of results obtained for the cer- tified reference material; sLC is the between-laboratories standard deviation of the certifying laboratories; swC is the within-laboratory standard deviation of the certifying laboratories; rzwC is th
6、e average number of replicate determinations in the certifying laboratories; NC is the number of certifying laboratories; r = 0,015 3x + 0,060 0 . . . (2) P = 0,021 5 X + 0,160 6 . I . (3) Qr = 0,0054x + 0,021 2 . . . (41 OL =0,0066X+0,0627 . . . (51 X is the iron(H) content, as a percentage by mass
7、, of the test sample, calculated as follows : - within-laboratory equations (2 and 4) : the arithmetic mean of the duplicate values; - between-laboratories equations (3 and 5) : the arithmetic mean of the final results (8.2.3) of the two iab- oratories; n is the number of replicate determinations on
8、 the reference material (in most cases n = I); oL and rI are as defined in 8,2.1. If condition (6) is satisfied, i.e. if the left-hand side is less than or equal to the right-hand side, then the difference/A, - A! is statistically insignificant; otherwise it is statistically significant. When the di
9、fference is significant, the analysis shall be repeated, simultaneously with an analysis of the test sample. If the difference is again significant, the procedure shall be repeated using a different certified reference material of the same type of ore. When the range of the two values for the test s
10、ample is outside the limit for r calculated according to equation (2) in 8.2.1, one or more additional tests shall be carried out. 1) Additional information is given in annexes Ei and C. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Tec
11、hnical Standards 1/9972545001 Not for Resale, 04/25/2007 00:23:01 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 9035 : 1999 (E) Acceptability of the results for the test sample shall, in each case, be subject to the acceptability of the results for the certi- fied ref
12、erence material. NOTE - The following procedure should be used when the infor- mation on the reference material certificate is incomplete : aJ if there are sufficient data to enable the between-laboratories standard deviation to be estimated, delete the expression $wc/nwc and regard qc as the standa
13、rd deviation of the laboratory means; b) if the certification has been made by only one laboratory or if the. inter-laboratory resulJs are missing, it is advisable fhat this maGial not be used in the application of the standard. In case its use is unavoidable, use the formula (7) 8.2,3 Calculation o
14、f final result The final result is the arithmetic mean of the acceptable analyti- cal values for the test sample, or as otherwise determined by the operations specified in annex A, calculated to three decimal places and rounded off to the first decimal place as follows : a) when the figure in the se
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ISO 9035 1989
链接地址:https://www.31doc.com/p-3780313.html