Warning: Personnel using this part of GB/T 7731 should have practical experience in formal laboratory work. This section does not address all possible security issues. It is the user's responsibility to take appropriate safety and health measures and ensure compliance with the conditions stipulated in the relevant national laws and regulations. This part of GB/T 7731 specifies the determination of bismuth content in ferro-tungsten by bismuth iodide photometry and inductively coupled plasma atomic emission spectrometry. This section applies to the determination of bismuth content in iron tungsten. Bismuth iodide photometric measurement range (mass fraction): 0.010% to 0.060%; inductively coupled plasma atomic emission spectrometry measurement range (mass fraction): 0.010% to 0.15%.
GB/T 7731.9-2008 Referenced Document
GB/T 4010 Ferroallys sampling and preparation of samples for chemical analysis*, 2015-09-11 Update
GB/T 7731.9-2008 history
2008GB/T 7731.9-2008 Ferrotungsten.Determination of bismuth content.The bismuth iodide photonmetric method and inductively coupled plasma-atomic emission spectrometry
1987GB/T 7731.9-1987 Methods for chemical analysis of ferrotungrten--The bismuth iodide photometric method for the determination of bismuth content