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1、INTERNATIONAL STANDARD IS0 11438-7 First edition 1993-l 2-01 Ferronickel - Determination of trace-element content by electrothermal atomic absorption spectrometric method - Part 7: Determination of silver content Ferro-nickel - Dosage des m is the mass, in grams, of the test portion; F is the diluti
2、on factor of 2,5. 7.2 Blank test Refer to 7.2 of IS0 11438-1:1993. 7.3 Determination by the standard additions method 7.3.1 Atomic absorption measurements 8.2 Precision Use the peak area integration absorbance measure- ment at a wavelength of 328,l nm and proceed with checking the electrothermal ato
3、mizer as directed in 7.3.1 of IS0 11438-I :1993. 8.2.1 Laboratory tests Six laboratories in five countries participated in the testing of this procedure using two samples of nomi- nal composition given in table 1. Samples were analysed three times on different days. 7.3.2 Semi-quantitative estimatio
4、n of the silver content 8.2.2 Statistical analysis Proceed as directed in 7.3.2 of IS0 11438-I :1993 8.2.2.1 Results from the interlaboratory test pro- gramme were evaluated according to IS0 5725 as described in 8.2.2 of IS0 11438-1:1993. The results of this analysis are given in table2. 7.3.3 Quant
5、itative determination of the silver content Proceed as directed in 7.3.3 of IS0 11438-I :I993 8.2.2.2 One laboratory was rejected as a Cochran outlier for sample 1. 7.3.4 Plotting of standard additions Proceed as directed in 7.3.4 of IS0 11438-I :I 993. 9 Test report Refer to clause 10 of IS0 11438-
6、I :1993. NOTE 1 The procedure is applicable to the linear part of the graphs. 2 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 21:06:55 MDTNo reproduction or networking permitte
7、d without license from IHS -,-,- IS0 11438-7:1993(E) Table 1 - Nominal composition of test samples Sample Content, g/t Content, % (m/m) Pb Sb Sn Te TI Ag In Bi As Se Cd Ga Ge Zn Ni Fe 1 1 1 1 0,5 0,5 1 0,5 0.1 3 0,5 0,5 2 1 2 25 Remainder , 2 ,6,4,10,2,1,6,2, 1 ,5,3,1,4,4,5,25,Remainder, Table 2 - R
8、esults of statistical analysis Sample 1 2 Mean s/t wAgc 0,92 5,91 Within-laboratory standard deviation 0,05 or4 Between-laboratory standard deviation Otl 089 Repeatability 0,15 181 Reproducibility 084 2,7 3 Copyright International Organization for Standardization Provided by IHS under license with I
9、SO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 21:06:55 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 11438-7:1993(E) UDC 669.245:543.422.064:546.57 Descriptors: nickel alloys, iron nickel alloys, ferroalloys, ferronickel, chemical analys
10、is, determination of content, trace elements, silver, atomic absorption spectrometric method. Price based on 3 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 21:06:55 MDTNo reproduction or networking permitted without license from IHS -,-,-