ISO-11438-5-1993.pdf
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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
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