ISO 6127:1981 Preview
Chromium ores -- Determination of phosphorus content -- Reduced molybdophosphate photometric method
The method is applicable to products having a phosphorus content of 0,002 to 0,1 % (m/m). ISO 6127 should be read in conjunction with ISO 6629. Specifies principle, reagents, apparatus, procedure and expression of results. Includes a warning to the dangers involved in the use of perchloric acid and hydrofluoric acid.