This standard specifies the potentiometric method for determining the pH value of a solution with a conventional concentration of 10 g/L of sodium tripolyphosphate for industrial use.
GB/T 9984.7-1988 history
2008GB/T 9984-2008 Test methods for industrial sodium tripolyphosphate
2004GB/T 9984.7-2004 Sodium tripolyphosphate for industrial use-Measurement of pH-Potentiometric method
1988GB/T 9984.7-1988 Sodium tripolyphosphate for industrial use--Masurement of pH potentiometric method