YB/T 5176-1993 Test method of raw material oil for carbon ink Determination method of potassium and sodium content (flame photometer method) (English Version)
2016YB/T 5176-2016 Determination of potassium and sodium content of raw material oil for carbon black by atomic absorption spectrometry and flame photometry
1970YB/T 5176-1993 Test method of raw material oil for carbon ink Determination method of potassium and sodium content (flame photometer method)