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1、INTERNATIONAL STANDARD IS0 11438-5 First edition 1993-l 2-01 Ferronickel - Determination of trace-element content by electrothermal atomic absorption spectrometric method - Part 5: Determination of tellurium content Ferro-nickel - Dosage des 7.3 Determination by the standard additions m is the mass,
2、 in grams, of the test portion; method F is the dilution factor of 2,5. 7.3.1 Atomic absorption measurements 8.2 Precision Use the peak area integration absorbance measure- ment at a wavelength of 214,3 nm and proceed with checking the electrothermal atomizer as directed in 7.3.1 of IS0 11438-1:1993
3、. 7.3.2 Semi-quantitative estimation of the tellurium content 8.2.1 Laboratory tests Seven 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. Proceed as directe
4、d in 7.3.2 of IS0 11438-I :I 993. 8.2.2 Statistical analysis 7.3.3 Quantitative determination of the tellurium content Proceed as directed in 7.3.3 of IS0 11438-l :I 993. 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
5、-1:1993. The results of this analysis are given in table2. 7.3.4 Plotting of standard additions 8.2.2.2 One laboratory gave no results for sample 1. All the laboratories passed statistical tests. Proceed as directed in 7.3.4 of IS0 11438-1 :I 993. NOTE 1 The procedure is applicable to the linear par
6、t of the graphs. 9 Test report Refer to clause 10 of IS0 11438-1 :I 993. 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 21:06:26 MDTNo reproduction or networking permitted wit
7、hout license from IHS -,-,- IS0 11438-5:1993(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,l 3 0,5 0,5 2 1 2 25 Remainder I 2 ,6,4,10,2,1,6,2, 1 ,5,3,1,4,4,5,25,Remainder, Table 2 - Result
8、s of statistical analysis Sample 1 2 Mean wye, g/t 0,35 I,97 Within-laboratory standard deviation O,l 02 Between-laboratory standard deviation Repeatability 0,1 02 02 Ok3 I 0,4 0,7 3 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technic
9、al Standards 1/9972545001 Not for Resale, 04/27/2007 21:06:26 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 11438-5:1993(E) UDC 669.245:543.422.064:546.24 Descriptors: nickel alloys, iron nickel alloys, ferroalloys, ferronickel, chemical analysis, determination of con
10、tent, trace elements, tellurium, atomic absorption spectrometric method, Price based on 3 oaaes Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 21:06:26 MDTNo reproduction or networking permitted without license from IHS -,-,-