The paper introduces the method of determination of fluoride content in the fluorinated alumina by the F ion selective electrode. The F ion concentration within a range of 0\^95ug/mL～3.8ug/mL has a good linear relation in the total ion strength adjustment solution of pH=6～7. The method has the higher sensitivity and selectivity, which is used in the determination of fluoride content in fluorinated alumina of aluminium pot fume.
The concentration of free cyanide is one of the main control indices for gold extraction liquid of cyanidation. Electrode poisoning is the main difficulty in free cyanide monitoring of cyanidation liguid with silver ion selective electrode. The poisoning ion is determined by electron probe analysis.