ISO-4694-1987.pdf
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1、INTERNATIONAL STANDARD INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION MEXjJYHAPOAHAR OPrAHM3AL(MR i-l0 CTAHAAPTM3AMM Iron ores - Determination of fluorine content - Ion-selective electrode method Minerais de fer - Dosage du fluor - Mbthode par m is the ma
2、ss, in milligrams, of the test portion. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 10:45:41 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 4694:1987 (
3、E) 8.2 General treatment of results 8.2.1 Repeatability and permissible tolerance The precision of this analytical method is expressed by the following regression equations:) r i 0,063 ox t 0,002 3 * I . (2) P =0,1481x+0,0032 . . . (3) =r = 0,0227X+ O,OC08 . . . (4) CL = 0,051 2x t 0,001 0 I . . (5)
4、 where X is the fluorine content, expressed as a percentage by mass, of the predried test sample, calculated as follows: - within-laboratory equations (2, 4); the arithmetic mean of the duplicate values, - between-laboratories equations (3, 5); the arith- metic mean of the final results (8.2.31 of t
5、he two labora- tories; r is the permissible tolerance within a laboratory (repeatability); P is the permissible tolerance between laboratories; u, is the within-laboratory standard deviation: a is the between-laboratories standard deviation. 8.2.2 Acceptance of analytical values The result obtained
6、for the certified reference material shall be such that the difference between this result and the certified value of the certified reference material is statistically inbigni- fiat- A is the result or the mean of results obtained for the cer- tified reference material; sL, is the between-laboratori
7、es standard deviation of the certifying laboratories; swC is the within-laboratory standard deviation of the cer- tifVing laboratories; owe is the average number of replicate determinations in the certifying laboratories; NC is the number of certifying laboratories; n is the number of replicate dete
8、rminations on the reference material (in most cases n = 1); bL and 0, are as defined in 8.2.1. If condition (6) issatisfied, i.e. if the left-hand side of the condi- tion is less than or equal to the right-hand side, then the dif- ference IA,-AI is statistically insignificant; otherwise, it is stati
9、stically significant, When the difference 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
10、 of the two values for the test sample is outside the limit for r calculated according to equation (2) in 8.2.1, one or more additional tests shall be carried out in accordance with the flowsheet presented in annex A, simultaneously with an analysis of a certified reference material of the same type
11、 of ore. Acceptability of the results for the test sample shall in each case be subject to the acceptability of the results for the certified reference material. NOTE - The following procedure should be used when the informa- tion on the reference material certificate is incomplete: a) if there are
12、sufficient data to enable the between-laboratories standard deviation to be estimated, delete the expression .(wJnwc and regard qc as the standard deviation of the laboratory means; bl if the certification has been made by only one laboratory or if the interlaboratory results ate missing, it is advi
13、sable not to use this material for this purpose. In case its use is unavoidable, use the formula: 8.2.3 Calculation of final result The final result is the arithmetic mean of the acceptable analytical values for the test sample, or as otherwise deter- mined by the operations specified in annex A, ca
14、lculated to five decimal places and rounded off to the third decimal place as follows: a) when the figure in the fourth decimal place is less than 5, it is discarded and the figure in the third decimal place is kept unchanged; b) when the figure in the fourth decimal place is 5 and there is a figure
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- ISO 4694 1987
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