ISO-8875-1992.pdf
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1、INTERNATIONAL STANDARD IS0 8875 Second edition 1992-l 2-l 5 All grades of fluorspar - Determination of moisture content of a lot Tous /es spaths fluor - D,e x 100 . . . where Mi is the moisture content, as a percentage by mass, of the ith test portion; ml is the initial mass, in grams, of the test p
2、ortion; m, is the mass, in grams, of the test portion after drying. 8.2 Moisture content of a lot The moisture content of a lot shall be calculated using one of the following equations, as appropriate, and reported to the first decimal place. 8.2.1 When mass-basis sampling has been per- formed and m
3、oisture determination is conducted on each partial sample, the weighted mean of the results from all the partial samples, with account taken of the number of increments for each partial sample, shall be the moisture content of the lot given by equation (2): . . . (2) k c Ni Mi M= i=: c Ni i=l where
4、M is the moisture content, as a percentage by mass, of a lot; k is the number of partial samples; Ni is the number of increments in the ith partial sample; Mi is the result of the moisture determination, as a percentage by mass, on the ith partial sample. If it is impracticable to sample the lot as
5、a whole or if it is advantageous to sample a lot in separate parts of unequal mass, as in the case of time-basis sam- pling, the moisture content of each part shall be de- termined independently and the weighted mean of the moisture content of the lot shall be calculated from the individual results
6、using equation (3): k c mi Mi ME i=; . . . (3) where M k mi Mi c mi i=l is the moisture content, as a percentage by mass, of a lot; is the number of parts in the lot; is the mass of the ith part. is the result of the moisture determination, as a percentage by mass, on the ith par-t. 8.2.2 When the m
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