1、INTERNATIONAL STANDARD INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION MEXAYHAPOAHAR OPTAHkl3AWl I-IO CTAHCAPTkl3AMM Methods for the petrographic analysis of bituminous coal and anthracite - Part 4: Method of determining microlithotype, carbominerite and m
2、inerite composition Mkhodes dlanalyse p or b) quantitative record of maceral groups under residual intersections may be recorded as shown in table 6. where ot is the theoretical standard deviation. Table 5 - An example of a method of expressing the results Sample No. Microlithotype Vitrite Liptite l
3、nertite Clarite Durite Vitrinertite Trimacerite Date: Number of accepted points Volume % 101 20 64 13 57 11 115 23 141 otal microlithotypes 28 95 Carbominerite I Number of accented ooints Volume % Total carbominerite 4 Number of accepted points Volume % Minerite Grand total Total number of accepted
4、points 500 Percentage of rejected points 7 Table 6 - Nature of coal associated with carbominerite and minerite (example) ! Accented Carbo- minerite/ minerite (specify) Carbopyrite Minerite v+I 5 100 I) E = exinite I = inertinite V = vitrinite 9 Precision 9.1 Repeatability The repeatability of the de
5、termination of the volume per- centage of a component is the difference between two single determinations each based on the same number of point counts carried out by the same operator on the same sample, using the same apparatus, below which 95 % of such dif- ferences would be expected to lie. The
6、repeatability may be calculated from the formula 4 Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided that the operator makes negligible errors in classifying the m
7、icrolithotypes, the results of an analysis will be subject to standard deviations calculable on the basis of the binomial distribution. Where p % of the total number of counts, Iv, is registered for a given microlithotype, the standard deviation, or, of p is given by the equation Values for the theo
8、retical standard deviation and repeatability calculated for a range of volume percentages of a component are given in table 7 based on 5CHl point counts. Table 7 - Theoretical standard deviation and repeatability of the percentage of a component based on SJII point counts Volume percentage, P 5 20 5
9、0 80 95 Standard deviation, a, of the volume percentage ItO I.8 22 13 180 Repeatability, (2 fi) ot 23 5-1 63 5,J 2.8 9.2 Reproducibility The reproducibility of the determination of the volume per- e) the nature of coal associated with the carbominerite centage of a component is the difference betwee
10、n two single and minerite if determined. determinations each based on the same number of point counts, carried out by two different operators on two separate sub-samples taken from the same sample, using different equipment, below which 95 % of such differences would be expected to lie. The reproduc
11、ibility is given by the formula (2 fi) CT0 where o, is the observed standard deviation. Values of the observed standard deviation normally exceed those of the theoretical values given in table 7 due to mis- identification of the microlithotypes or minerals by different operators and to variation bet
12、ween sub-samples. There is, at present, insufficient evidence from collaborative analyses to estimate the effect of misidentification. IO Test report The test report shall include the following information : a) reference to this part of IS0 7404; b) all details necessary for identification of the sa
13、mple; cl number of accepted points analysed and the percen- tage of rejected points; d) the results obtained; 6 Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-IS0 7404-4
14、 : 1988 (Ia 7 Vitrinite lnertinite - Exinite Immersion medium a) Point accepted b) Point accepted All intersections on coal 10 intersections on coal Microlithotype vitrite Microlithotype clarite All intersections on vitrinite 9 intersections on vitrinite, 2 on exinite cl Point rejected but recorded
15、separately 10 intersections on coal d) No point recorded No intersections on coal NOTE - The count of intersections is made on a single particle. Figure 2 - Criteria used to determine the categories of accepted and rejected points UBC 882.88 : 552.1 Descriptors: minerals and ores, solid fuels, coal,
16、 bituminous coal, anthracite, tests, determination of content, microlithotypes, petrography, microscopic analysis. Price based on 6 pages 8 Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
