Abstract:

There is great significance of cyanide detection to mineral processing and environmental protection in water.The article investigate the reagent dosage of phosphoric acid，EDTA solution and absorption liquid NaOH in practical application for the method of state environmental standards.The result shows that it can guarantee the result accuracy only if it meet the condition of the predetermining water sample at pH>12 and increasing phosphoric acid amount modestly.It is needed to increase the concentration of absorption liquid NaOH to improve the experiment effect when total cyanide value is a little large.The study consequence show that there is little influence on the result determination，whether the additional EDTA solution has been added or not.

Key words: cyanide, total cyanide determination, reagent factors, detection of environmental protection