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View larger ISO 11438-7:1993 [ Withdrawn ]
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ISO 11438-7:1993 Ferronickel - Determination of trace-element content by electrothermal atomic absorption spectrometric method - Part 7: Determination of silver content
standard by International Organization for Standardization, 12/01/1993
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The principle of the method specified is dissolution of a test portion in nitric acid, measurement of the absorption of the resonance line energy from the spectrum of silver in the test solution at a wavelength of 328,1 nm by an atomic absorption spectrometer fitted with a graphite furnace electrothermal atomizer, calibration by the standard additions method described in ISO 11438-1. Applies to silver contents in the range of 1,0 g/t to 6,0 g/t in ferronickel.