ISO 11400:1992 Preview
Nickel, ferronickel and nickel alloys -- Determination of phosphorus content -- Phosphovanadomolybdate molecular absorption spectrometric method
This standard was last reviewed and confirmed in 2015. Therefore this version remains current.
Phosphorus content can be determined in the range of 0,000 5 % (m/m) to 0,05 % (m/m). As, Cr, Hf, Nb, Si, Ta, Ti, W interfere, but the interferences can be avoided. The principle is dissolution of a test portion in a mixture of nitric and hydrochloric acids, fuming with perchloric acid, removal of chromium, complexation of silicon, conversion of phosphorus to phosphovanadomolybdic acid, extraction of this compound.
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